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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 57 | pj | 1 | /* $Id: s_linetemp.h,v 1.1 2003-02-28 11:49:42 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 5.0 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | /* |
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| 29 | * Line Rasterizer Template |
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| 30 | * |
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| 31 | * This file is #include'd to generate custom line rasterizers. |
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| 32 | * |
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| 33 | * The following macros may be defined to indicate what auxillary information |
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| 34 | * must be interplated along the line: |
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| 35 | * INTERP_Z - if defined, interpolate Z values |
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| 36 | * INTERP_FOG - if defined, interpolate FOG values |
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| 37 | * INTERP_RGB - if defined, interpolate RGB values |
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| 38 | * INTERP_SPEC - if defined, interpolate specular RGB values |
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| 39 | * INTERP_ALPHA - if defined, interpolate Alpha values |
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| 40 | * INTERP_INDEX - if defined, interpolate color index values |
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| 41 | * INTERP_TEX - if defined, interpolate unit 0 texcoords |
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| 42 | * INTERP_MULTITEX - if defined, interpolate multi-texcoords |
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| 43 | * |
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| 44 | * When one can directly address pixels in the color buffer the following |
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| 45 | * macros can be defined and used to directly compute pixel addresses during |
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| 46 | * rasterization (see pixelPtr): |
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| 47 | * PIXEL_TYPE - the datatype of a pixel (GLubyte, GLushort, GLuint) |
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| 48 | * BYTES_PER_ROW - number of bytes per row in the color buffer |
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| 49 | * PIXEL_ADDRESS(X,Y) - returns the address of pixel at (X,Y) where |
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| 50 | * Y==0 at bottom of screen and increases upward. |
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| 51 | * |
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| 52 | * Similarly, for direct depth buffer access, this type is used for depth |
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| 53 | * buffer addressing: |
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| 54 | * DEPTH_TYPE - either GLushort or GLuint |
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| 55 | * |
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| 56 | * Optionally, one may provide one-time setup code |
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| 57 | * SETUP_CODE - code which is to be executed once per line |
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| 58 | * |
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| 59 | * To actually "plot" each pixel the PLOT macro must be defined... |
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| 60 | * PLOT(X,Y) - code to plot a pixel. Example: |
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| 61 | * if (Z < *zPtr) { |
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| 62 | * *zPtr = Z; |
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| 63 | * color = pack_rgb( FixedToInt(r0), FixedToInt(g0), |
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| 64 | * FixedToInt(b0) ); |
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| 65 | * put_pixel( X, Y, color ); |
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| 66 | * } |
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| 67 | * |
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| 68 | * This code was designed for the origin to be in the lower-left corner. |
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| 69 | * |
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| 70 | */ |
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| 71 | |||
| 72 | |||
| 73 | /*void line( GLcontext *ctx, const SWvertex *vert0, const SWvertex *vert1 )*/ |
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| 74 | { |
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| 75 | GLint x0 = (GLint) vert0->win[0]; |
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| 76 | GLint x1 = (GLint) vert1->win[0]; |
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| 77 | GLint y0 = (GLint) vert0->win[1]; |
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| 78 | GLint y1 = (GLint) vert1->win[1]; |
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| 79 | GLint dx, dy; |
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| 80 | #ifdef INTERP_XY |
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| 81 | GLint xstep, ystep; |
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| 82 | #endif |
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| 83 | #ifdef INTERP_Z |
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| 84 | GLint z0, z1, dz; |
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| 85 | const GLint depthBits = ctx->Visual.depthBits; |
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| 86 | const GLint fixedToDepthShift = depthBits <= 16 ? FIXED_SHIFT : 0; |
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| 87 | # define FixedToDepth(F) ((F) >> fixedToDepthShift) |
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| 88 | # ifdef DEPTH_TYPE |
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| 89 | GLint zPtrXstep, zPtrYstep; |
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| 90 | DEPTH_TYPE *zPtr; |
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| 91 | # endif |
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| 92 | #endif |
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| 93 | #ifdef INTERP_FOG |
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| 94 | GLfloat fog0 = vert0->fog; |
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| 95 | GLfloat dfog = vert1->fog - fog0; |
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| 96 | #endif |
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| 97 | #ifdef INTERP_RGB |
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| 98 | GLfixed r0 = ChanToFixed(vert0->color[0]); |
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| 99 | GLfixed dr = ChanToFixed(vert1->color[0]) - r0; |
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| 100 | GLfixed g0 = ChanToFixed(vert0->color[1]); |
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| 101 | GLfixed dg = ChanToFixed(vert1->color[1]) - g0; |
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| 102 | GLfixed b0 = ChanToFixed(vert0->color[2]); |
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| 103 | GLfixed db = ChanToFixed(vert1->color[2]) - b0; |
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| 104 | #endif |
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| 105 | #ifdef INTERP_SPEC |
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| 106 | GLfixed sr0 = ChanToFixed(vert0->specular[0]); |
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| 107 | GLfixed dsr = ChanToFixed(vert1->specular[0]) - sr0; |
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| 108 | GLfixed sg0 = ChanToFixed(vert0->specular[1]); |
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| 109 | GLfixed dsg = ChanToFixed(vert1->specular[1]) - sg0; |
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| 110 | GLfixed sb0 = ChanToFixed(vert0->specular[2]); |
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| 111 | GLfixed dsb = ChanToFixed(vert1->specular[2]) - sb0; |
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| 112 | #endif |
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| 113 | #ifdef INTERP_ALPHA |
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| 114 | GLfixed a0 = ChanToFixed(vert0->color[3]); |
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| 115 | GLfixed da = ChanToFixed(vert1->color[3]) - a0; |
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| 116 | #endif |
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| 117 | #ifdef INTERP_INDEX |
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| 118 | GLint i0 = vert0->index << 8; |
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| 119 | GLint di = (GLint) (vert1->index << 8) - i0; |
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| 120 | #endif |
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| 121 | #ifdef INTERP_TEX |
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| 122 | const GLfloat invw0 = vert0->win[3]; |
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| 123 | const GLfloat invw1 = vert1->win[3]; |
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| 124 | GLfloat tex[4]; |
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| 125 | GLfloat dtex[4]; |
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| 126 | GLfloat fragTexcoord[4]; |
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| 127 | #endif |
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| 128 | #ifdef INTERP_MULTITEX |
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| 129 | const GLfloat invw0 = vert0->win[3]; |
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| 130 | const GLfloat invw1 = vert1->win[3]; |
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| 131 | GLfloat tex[MAX_TEXTURE_UNITS][4]; |
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| 132 | GLfloat dtex[MAX_TEXTURE_UNITS][4]; |
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| 133 | GLfloat fragTexcoord[MAX_TEXTURE_UNITS][4]; |
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| 134 | #endif |
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| 135 | #ifdef PIXEL_ADDRESS |
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| 136 | PIXEL_TYPE *pixelPtr; |
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| 137 | GLint pixelXstep, pixelYstep; |
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| 138 | #endif |
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| 139 | #ifdef INTERP_TEX |
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| 140 | { |
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| 141 | tex[0] = invw0 * vert0->texcoord[0][0]; |
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| 142 | dtex[0] = invw1 * vert1->texcoord[0][0] - tex[0]; |
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| 143 | tex[1] = invw0 * vert0->texcoord[0][1]; |
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| 144 | dtex[1] = invw1 * vert1->texcoord[0][1] - tex[1]; |
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| 145 | tex[2] = invw0 * vert0->texcoord[0][2]; |
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| 146 | dtex[2] = invw1 * vert1->texcoord[0][2] - tex[2]; |
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| 147 | tex[3] = invw0 * vert0->texcoord[0][3]; |
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| 148 | dtex[3] = invw1 * vert1->texcoord[0][3] - tex[3]; |
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| 149 | } |
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| 150 | #endif |
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| 151 | #ifdef INTERP_MULTITEX |
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| 152 | { |
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| 153 | GLuint u; |
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| 154 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 155 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 156 | tex[u][0] = invw0 * vert0->texcoord[u][0]; |
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| 157 | dtex[u][0] = invw1 * vert1->texcoord[u][0] - tex[u][0]; |
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| 158 | tex[u][1] = invw0 * vert0->texcoord[u][1]; |
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| 159 | dtex[u][1] = invw1 * vert1->texcoord[u][1] - tex[u][1]; |
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| 160 | tex[u][2] = invw0 * vert0->texcoord[u][2]; |
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| 161 | dtex[u][2] = invw1 * vert1->texcoord[u][2] - tex[u][2]; |
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| 162 | tex[u][3] = invw0 * vert0->texcoord[u][3]; |
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| 163 | dtex[u][3] = invw1 * vert1->texcoord[u][3] - tex[u][3]; |
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| 164 | } |
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| 165 | } |
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| 166 | } |
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| 167 | #endif |
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| 168 | |||
| 169 | /* Cull primitives with malformed coordinates. |
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| 170 | */ |
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| 171 | { |
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| 172 | float tmp = vert0->win[0] + vert0->win[1] + vert1->win[0] + vert1->win[1]; |
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| 173 | if (IS_INF_OR_NAN(tmp)) |
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| 174 | return; |
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| 175 | } |
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| 176 | |||
| 177 | /* |
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| 178 | printf("%s():\n", __FUNCTION__); |
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| 179 | printf(" (%f, %f, %f) -> (%f, %f, %f)\n", |
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| 180 | vert0->win[0], vert0->win[1], vert0->win[2], |
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| 181 | vert1->win[0], vert1->win[1], vert1->win[2]); |
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| 182 | printf(" (%d, %d, %d) -> (%d, %d, %d)\n", |
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| 183 | vert0->color[0], vert0->color[1], vert0->color[2], |
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| 184 | vert1->color[0], vert1->color[1], vert1->color[2]); |
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| 185 | printf(" (%d, %d, %d) -> (%d, %d, %d)\n", |
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| 186 | vert0->specular[0], vert0->specular[1], vert0->specular[2], |
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| 187 | vert1->specular[0], vert1->specular[1], vert1->specular[2]); |
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| 188 | */ |
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| 189 | |||
| 190 | /* |
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| 191 | * Despite being clipped to the view volume, the line's window coordinates |
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| 192 | * may just lie outside the window bounds. That is, if the legal window |
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| 193 | * coordinates are [0,W-1][0,H-1], it's possible for x==W and/or y==H. |
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| 194 | * This quick and dirty code nudges the endpoints inside the window if |
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| 195 | * necessary. |
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| 196 | */ |
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| 197 | #ifdef CLIP_HACK |
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| 198 | { |
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| 199 | GLint w = ctx->DrawBuffer->Width; |
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| 200 | GLint h = ctx->DrawBuffer->Height; |
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| 201 | if ((x0==w) | (x1==w)) { |
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| 202 | if ((x0==w) & (x1==w)) |
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| 203 | return; |
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| 204 | x0 -= x0==w; |
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| 205 | x1 -= x1==w; |
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| 206 | } |
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| 207 | if ((y0==h) | (y1==h)) { |
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| 208 | if ((y0==h) & (y1==h)) |
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| 209 | return; |
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| 210 | y0 -= y0==h; |
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| 211 | y1 -= y1==h; |
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| 212 | } |
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| 213 | } |
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| 214 | #endif |
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| 215 | dx = x1 - x0; |
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| 216 | dy = y1 - y0; |
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| 217 | if (dx==0 && dy==0) { |
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| 218 | return; |
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| 219 | } |
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| 220 | |||
| 221 | /* |
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| 222 | * Setup |
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| 223 | */ |
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| 224 | #ifdef SETUP_CODE |
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| 225 | SETUP_CODE |
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| 226 | #endif |
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| 227 | |||
| 228 | #ifdef INTERP_Z |
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| 229 | # ifdef DEPTH_TYPE |
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| 230 | zPtr = (DEPTH_TYPE *) _mesa_zbuffer_address(ctx, x0, y0); |
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| 231 | # endif |
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| 232 | if (depthBits <= 16) { |
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| 233 | z0 = FloatToFixed(vert0->win[2]) + FIXED_HALF; |
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| 234 | z1 = FloatToFixed(vert1->win[2]) + FIXED_HALF; |
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| 235 | } |
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| 236 | else { |
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| 237 | z0 = (int) vert0->win[2]; |
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| 238 | z1 = (int) vert1->win[2]; |
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| 239 | } |
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| 240 | #endif |
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| 241 | #ifdef PIXEL_ADDRESS |
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| 242 | pixelPtr = (PIXEL_TYPE *) PIXEL_ADDRESS(x0,y0); |
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| 243 | #endif |
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| 244 | |||
| 245 | if (dx<0) { |
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| 246 | dx = -dx; /* make positive */ |
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| 247 | #ifdef INTERP_XY |
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| 248 | xstep = -1; |
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| 249 | #endif |
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| 250 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 251 | zPtrXstep = -((GLint)sizeof(DEPTH_TYPE)); |
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| 252 | #endif |
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| 253 | #ifdef PIXEL_ADDRESS |
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| 254 | pixelXstep = -((GLint)sizeof(PIXEL_TYPE)); |
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| 255 | #endif |
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| 256 | } |
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| 257 | else { |
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| 258 | #ifdef INTERP_XY |
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| 259 | xstep = 1; |
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| 260 | #endif |
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| 261 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 262 | zPtrXstep = ((GLint)sizeof(DEPTH_TYPE)); |
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| 263 | #endif |
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| 264 | #ifdef PIXEL_ADDRESS |
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| 265 | pixelXstep = ((GLint)sizeof(PIXEL_TYPE)); |
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| 266 | #endif |
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| 267 | } |
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| 268 | |||
| 269 | if (dy<0) { |
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| 270 | dy = -dy; /* make positive */ |
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| 271 | #ifdef INTERP_XY |
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| 272 | ystep = -1; |
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| 273 | #endif |
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| 274 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 275 | zPtrYstep = -((GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE))); |
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| 276 | #endif |
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| 277 | #ifdef PIXEL_ADDRESS |
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| 278 | pixelYstep = BYTES_PER_ROW; |
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| 279 | #endif |
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| 280 | } |
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| 281 | else { |
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| 282 | #ifdef INTERP_XY |
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| 283 | ystep = 1; |
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| 284 | #endif |
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| 285 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 286 | zPtrYstep = (GLint) (ctx->DrawBuffer->Width * sizeof(DEPTH_TYPE)); |
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| 287 | #endif |
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| 288 | #ifdef PIXEL_ADDRESS |
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| 289 | pixelYstep = -(BYTES_PER_ROW); |
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| 290 | #endif |
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| 291 | } |
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| 292 | |||
| 293 | /* |
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| 294 | * Draw |
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| 295 | */ |
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| 296 | |||
| 297 | if (dx>dy) { |
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| 298 | /*** X-major line ***/ |
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| 299 | GLint i; |
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| 300 | GLint errorInc = dy+dy; |
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| 301 | GLint error = errorInc-dx; |
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| 302 | GLint errorDec = error-dx; |
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| 303 | #ifdef SET_XMAJOR |
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| 304 | xMajor = GL_TRUE; |
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| 305 | #endif |
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| 306 | #ifdef INTERP_Z |
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| 307 | dz = (z1-z0) / dx; |
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| 308 | #endif |
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| 309 | #ifdef INTERP_FOG |
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| 310 | dfog /= dx; |
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| 311 | #endif |
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| 312 | #ifdef INTERP_RGB |
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| 313 | dr /= dx; /* convert from whole line delta to per-pixel delta */ |
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| 314 | dg /= dx; |
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| 315 | db /= dx; |
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| 316 | #endif |
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| 317 | #ifdef INTERP_SPEC |
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| 318 | dsr /= dx; /* convert from whole line delta to per-pixel delta */ |
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| 319 | dsg /= dx; |
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| 320 | dsb /= dx; |
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| 321 | #endif |
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| 322 | #ifdef INTERP_ALPHA |
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| 323 | da /= dx; |
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| 324 | #endif |
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| 325 | #ifdef INTERP_INDEX |
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| 326 | di /= dx; |
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| 327 | #endif |
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| 328 | #ifdef INTERP_TEX |
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| 329 | { |
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| 330 | const GLfloat invDx = 1.0F / (GLfloat) dx; |
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| 331 | dtex[0] *= invDx; |
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| 332 | dtex[1] *= invDx; |
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| 333 | dtex[2] *= invDx; |
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| 334 | dtex[3] *= invDx; |
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| 335 | } |
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| 336 | #endif |
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| 337 | #ifdef INTERP_MULTITEX |
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| 338 | { |
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| 339 | const GLfloat invDx = 1.0F / (GLfloat) dx; |
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| 340 | GLuint u; |
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| 341 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 342 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 343 | dtex[u][0] *= invDx; |
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| 344 | dtex[u][1] *= invDx; |
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| 345 | dtex[u][2] *= invDx; |
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| 346 | dtex[u][3] *= invDx; |
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| 347 | } |
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| 348 | } |
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| 349 | } |
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| 350 | #endif |
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| 351 | |||
| 352 | for (i=0;i<dx;i++) { |
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| 353 | #ifdef INTERP_Z |
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| 354 | GLdepth Z = FixedToDepth(z0); |
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| 355 | #endif |
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| 356 | #ifdef INTERP_INDEX |
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| 357 | GLint I = i0 >> 8; |
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| 358 | #endif |
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| 359 | #ifdef INTERP_TEX |
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| 360 | { |
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| 361 | const GLfloat invQ = tex[3] ? (1.0F / tex[3]) : 1.0F; |
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| 362 | fragTexcoord[0] = tex[0] * invQ; |
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| 363 | fragTexcoord[1] = tex[1] * invQ; |
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| 364 | fragTexcoord[2] = tex[2] * invQ; |
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| 365 | fragTexcoord[3] = tex[3]; |
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| 366 | } |
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| 367 | #endif |
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| 368 | #ifdef INTERP_MULTITEX |
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| 369 | { |
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| 370 | GLuint u; |
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| 371 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 372 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 373 | const GLfloat invQ = 1.0F / tex[u][3]; |
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| 374 | fragTexcoord[u][0] = tex[u][0] * invQ; |
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| 375 | fragTexcoord[u][1] = tex[u][1] * invQ; |
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| 376 | fragTexcoord[u][2] = tex[u][2] * invQ; |
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| 377 | fragTexcoord[u][3] = tex[u][3]; |
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| 378 | } |
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| 379 | } |
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| 380 | } |
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| 381 | #endif |
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| 382 | |||
| 383 | PLOT( x0, y0 ); |
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| 384 | |||
| 385 | #ifdef INTERP_XY |
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| 386 | x0 += xstep; |
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| 387 | #endif |
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| 388 | #ifdef INTERP_Z |
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| 389 | # ifdef DEPTH_TYPE |
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| 390 | zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); |
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| 391 | # endif |
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| 392 | z0 += dz; |
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| 393 | #endif |
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| 394 | #ifdef INTERP_FOG |
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| 395 | fog0 += dfog; |
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| 396 | #endif |
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| 397 | #ifdef INTERP_RGB |
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| 398 | r0 += dr; |
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| 399 | g0 += dg; |
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| 400 | b0 += db; |
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| 401 | #endif |
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| 402 | #ifdef INTERP_SPEC |
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| 403 | sr0 += dsr; |
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| 404 | sg0 += dsg; |
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| 405 | sb0 += dsb; |
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| 406 | #endif |
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| 407 | #ifdef INTERP_ALPHA |
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| 408 | a0 += da; |
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| 409 | #endif |
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| 410 | #ifdef INTERP_INDEX |
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| 411 | i0 += di; |
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| 412 | #endif |
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| 413 | #ifdef INTERP_TEX |
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| 414 | tex[0] += dtex[0]; |
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| 415 | tex[1] += dtex[1]; |
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| 416 | tex[2] += dtex[2]; |
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| 417 | tex[3] += dtex[3]; |
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| 418 | #endif |
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| 419 | #ifdef INTERP_MULTITEX |
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| 420 | { |
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| 421 | GLuint u; |
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| 422 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 423 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 424 | tex[u][0] += dtex[u][0]; |
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| 425 | tex[u][1] += dtex[u][1]; |
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| 426 | tex[u][2] += dtex[u][2]; |
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| 427 | tex[u][3] += dtex[u][3]; |
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| 428 | } |
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| 429 | } |
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| 430 | } |
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| 431 | #endif |
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| 432 | |||
| 433 | #ifdef PIXEL_ADDRESS |
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| 434 | pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); |
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| 435 | #endif |
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| 436 | if (error<0) { |
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| 437 | error += errorInc; |
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| 438 | } |
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| 439 | else { |
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| 440 | error += errorDec; |
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| 441 | #ifdef INTERP_XY |
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| 442 | y0 += ystep; |
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| 443 | #endif |
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| 444 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 445 | zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); |
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| 446 | #endif |
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| 447 | #ifdef PIXEL_ADDRESS |
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| 448 | pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); |
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| 449 | #endif |
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| 450 | } |
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| 451 | } |
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| 452 | } |
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| 453 | else { |
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| 454 | /*** Y-major line ***/ |
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| 455 | GLint i; |
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| 456 | GLint errorInc = dx+dx; |
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| 457 | GLint error = errorInc-dy; |
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| 458 | GLint errorDec = error-dy; |
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| 459 | #ifdef INTERP_Z |
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| 460 | dz = (z1-z0) / dy; |
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| 461 | #endif |
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| 462 | #ifdef INTERP_FOG |
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| 463 | dfog /= dy; |
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| 464 | #endif |
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| 465 | #ifdef INTERP_RGB |
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| 466 | dr /= dy; /* convert from whole line delta to per-pixel delta */ |
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| 467 | dg /= dy; |
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| 468 | db /= dy; |
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| 469 | #endif |
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| 470 | #ifdef INTERP_SPEC |
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| 471 | dsr /= dy; /* convert from whole line delta to per-pixel delta */ |
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| 472 | dsg /= dy; |
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| 473 | dsb /= dy; |
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| 474 | #endif |
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| 475 | #ifdef INTERP_ALPHA |
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| 476 | da /= dy; |
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| 477 | #endif |
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| 478 | #ifdef INTERP_INDEX |
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| 479 | di /= dy; |
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| 480 | #endif |
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| 481 | #ifdef INTERP_TEX |
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| 482 | { |
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| 483 | const GLfloat invDy = 1.0F / (GLfloat) dy; |
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| 484 | dtex[0] *= invDy; |
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| 485 | dtex[1] *= invDy; |
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| 486 | dtex[2] *= invDy; |
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| 487 | dtex[3] *= invDy; |
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| 488 | } |
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| 489 | #endif |
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| 490 | #ifdef INTERP_MULTITEX |
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| 491 | { |
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| 492 | const GLfloat invDy = 1.0F / (GLfloat) dy; |
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| 493 | GLuint u; |
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| 494 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 495 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 496 | dtex[u][0] *= invDy; |
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| 497 | dtex[u][1] *= invDy; |
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| 498 | dtex[u][2] *= invDy; |
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| 499 | dtex[u][3] *= invDy; |
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| 500 | } |
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| 501 | } |
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| 502 | } |
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| 503 | #endif |
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| 504 | |||
| 505 | for (i=0;i<dy;i++) { |
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| 506 | #ifdef INTERP_Z |
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| 507 | GLdepth Z = FixedToDepth(z0); |
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| 508 | #endif |
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| 509 | #ifdef INTERP_INDEX |
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| 510 | GLint I = i0 >> 8; |
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| 511 | #endif |
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| 512 | #ifdef INTERP_TEX |
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| 513 | { |
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| 514 | const GLfloat invQ = tex[3] ? (1.0F / tex[3]) : 1.0F; |
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| 515 | fragTexcoord[0] = tex[0] * invQ; |
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| 516 | fragTexcoord[1] = tex[1] * invQ; |
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| 517 | fragTexcoord[2] = tex[2] * invQ; |
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| 518 | fragTexcoord[3] = tex[3]; |
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| 519 | } |
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| 520 | #endif |
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| 521 | #ifdef INTERP_MULTITEX |
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| 522 | { |
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| 523 | GLuint u; |
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| 524 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 525 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 526 | const GLfloat invQ = 1.0F / tex[u][3]; |
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| 527 | fragTexcoord[u][0] = tex[u][0] * invQ; |
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| 528 | fragTexcoord[u][1] = tex[u][1] * invQ; |
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| 529 | fragTexcoord[u][2] = tex[u][2] * invQ; |
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| 530 | fragTexcoord[u][3] = tex[u][3]; |
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| 531 | } |
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| 532 | } |
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| 533 | } |
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| 534 | #endif |
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| 535 | |||
| 536 | PLOT( x0, y0 ); |
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| 537 | |||
| 538 | #ifdef INTERP_XY |
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| 539 | y0 += ystep; |
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| 540 | #endif |
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| 541 | #ifdef INTERP_Z |
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| 542 | # ifdef DEPTH_TYPE |
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| 543 | zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrYstep); |
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| 544 | # endif |
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| 545 | z0 += dz; |
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| 546 | #endif |
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| 547 | #ifdef INTERP_FOG |
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| 548 | fog0 += dfog; |
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| 549 | #endif |
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| 550 | #ifdef INTERP_RGB |
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| 551 | r0 += dr; |
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| 552 | g0 += dg; |
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| 553 | b0 += db; |
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| 554 | #endif |
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| 555 | #ifdef INTERP_SPEC |
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| 556 | sr0 += dsr; |
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| 557 | sg0 += dsg; |
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| 558 | sb0 += dsb; |
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| 559 | #endif |
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| 560 | #ifdef INTERP_ALPHA |
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| 561 | a0 += da; |
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| 562 | #endif |
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| 563 | #ifdef INTERP_INDEX |
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| 564 | i0 += di; |
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| 565 | #endif |
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| 566 | #ifdef INTERP_TEX |
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| 567 | tex[0] += dtex[0]; |
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| 568 | tex[1] += dtex[1]; |
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| 569 | tex[2] += dtex[2]; |
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| 570 | tex[3] += dtex[3]; |
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| 571 | #endif |
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| 572 | #ifdef INTERP_MULTITEX |
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| 573 | { |
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| 574 | GLuint u; |
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| 575 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 576 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 577 | tex[u][0] += dtex[u][0]; |
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| 578 | tex[u][1] += dtex[u][1]; |
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| 579 | tex[u][2] += dtex[u][2]; |
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| 580 | tex[u][3] += dtex[u][3]; |
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| 581 | } |
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| 582 | } |
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| 583 | } |
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| 584 | #endif |
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| 585 | #ifdef PIXEL_ADDRESS |
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| 586 | pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelYstep); |
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| 587 | #endif |
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| 588 | if (error<0) { |
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| 589 | error += errorInc; |
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| 590 | } |
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| 591 | else { |
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| 592 | error += errorDec; |
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| 593 | #ifdef INTERP_XY |
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| 594 | x0 += xstep; |
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| 595 | #endif |
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| 596 | #if defined(INTERP_Z) && defined(DEPTH_TYPE) |
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| 597 | zPtr = (DEPTH_TYPE *) ((GLubyte*) zPtr + zPtrXstep); |
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| 598 | #endif |
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| 599 | #ifdef PIXEL_ADDRESS |
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| 600 | pixelPtr = (PIXEL_TYPE*) ((GLubyte*) pixelPtr + pixelXstep); |
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| 601 | #endif |
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| 602 | } |
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| 603 | } |
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| 604 | } |
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| 605 | |||
| 606 | } |
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| 607 | |||
| 608 | |||
| 609 | #undef INTERP_XY |
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| 610 | #undef INTERP_Z |
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| 611 | #undef INTERP_FOG |
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| 612 | #undef INTERP_RGB |
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| 613 | #undef INTERP_SPEC |
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| 614 | #undef INTERP_ALPHA |
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| 615 | #undef INTERP_TEX |
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| 616 | #undef INTERP_MULTITEX |
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| 617 | #undef INTERP_INDEX |
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| 618 | #undef PIXEL_ADDRESS |
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| 619 | #undef PIXEL_TYPE |
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| 620 | #undef DEPTH_TYPE |
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| 621 | #undef BYTES_PER_ROW |
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| 622 | #undef SETUP_CODE |
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| 623 | #undef PLOT |
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| 624 | #undef CLIP_HACK |
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| 625 | #undef FixedToDepth |
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| 626 | #undef SET_XMAJOR |