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| Rev | Author | Line No. | Line |
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| 143 | giacomo | 1 | /* $Id: ss_tritmp.h,v 1.1 2003-04-29 12:46:52 giacomo 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 | * Authors: |
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| 27 | * Keith Whitwell <keith@tungstengraphics.com> |
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| 28 | */ |
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| 29 | |||
| 30 | |||
| 31 | static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) |
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| 32 | { |
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| 33 | struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
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| 34 | SWvertex *verts = SWSETUP_CONTEXT(ctx)->verts; |
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| 35 | SWvertex *v[3]; |
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| 36 | GLfloat z[3]; |
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| 37 | GLfloat offset; |
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| 38 | GLenum mode = GL_FILL; |
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| 39 | GLuint facing = 0; |
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| 40 | |||
| 41 | v[0] = &verts[e0]; |
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| 42 | v[1] = &verts[e1]; |
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| 43 | v[2] = &verts[e2]; |
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| 44 | |||
| 45 | |||
| 46 | if (IND & (SS_TWOSIDE_BIT | SS_OFFSET_BIT | SS_UNFILLED_BIT)) |
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| 47 | { |
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| 48 | GLfloat ex = v[0]->win[0] - v[2]->win[0]; |
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| 49 | GLfloat ey = v[0]->win[1] - v[2]->win[1]; |
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| 50 | GLfloat fx = v[1]->win[0] - v[2]->win[0]; |
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| 51 | GLfloat fy = v[1]->win[1] - v[2]->win[1]; |
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| 52 | GLfloat cc = ex*fy - ey*fx; |
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| 53 | |||
| 54 | if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)) |
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| 55 | { |
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| 56 | facing = (cc < 0.0) ^ ctx->Polygon._FrontBit; |
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| 57 | if (ctx->Stencil.TestTwoSide) |
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| 58 | ctx->_Facing = facing; /* for 2-sided stencil test */ |
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| 59 | |||
| 60 | if (IND & SS_UNFILLED_BIT) |
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| 61 | mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode; |
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| 62 | |||
| 63 | if (facing == 1) { |
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| 64 | if (IND & SS_TWOSIDE_BIT) { |
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| 65 | if (IND & SS_RGBA_BIT) { |
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| 66 | GLchan (*vbcolor)[4] = (GLchan (*)[4])VB->ColorPtr[1]->Ptr; |
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| 67 | SS_COLOR(v[0]->color, vbcolor[e0]); |
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| 68 | SS_COLOR(v[1]->color, vbcolor[e1]); |
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| 69 | SS_COLOR(v[2]->color, vbcolor[e2]); |
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| 70 | if (VB->SecondaryColorPtr[1]) { |
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| 71 | GLchan (*vbspec)[4] = (GLchan (*)[4])VB->SecondaryColorPtr[1]->Ptr; |
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| 72 | SS_SPEC(v[0]->specular, vbspec[e0]); |
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| 73 | SS_SPEC(v[1]->specular, vbspec[e1]); |
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| 74 | SS_SPEC(v[2]->specular, vbspec[e2]); |
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| 75 | } |
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| 76 | } else { |
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| 77 | GLuint *vbindex = VB->IndexPtr[1]->data; |
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| 78 | SS_IND(v[0]->index, vbindex[e0]); |
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| 79 | SS_IND(v[1]->index, vbindex[e1]); |
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| 80 | SS_IND(v[2]->index, vbindex[e2]); |
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| 81 | } |
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| 82 | } |
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| 83 | } |
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| 84 | } |
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| 85 | |||
| 86 | if (IND & SS_OFFSET_BIT) |
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| 87 | { |
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| 88 | offset = ctx->Polygon.OffsetUnits; |
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| 89 | z[0] = v[0]->win[2]; |
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| 90 | z[1] = v[1]->win[2]; |
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| 91 | z[2] = v[2]->win[2]; |
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| 92 | if (cc * cc > 1e-16) { |
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| 93 | GLfloat ez = z[0] - z[2]; |
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| 94 | GLfloat fz = z[1] - z[2]; |
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| 95 | GLfloat a = ey*fz - ez*fy; |
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| 96 | GLfloat b = ez*fx - ex*fz; |
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| 97 | GLfloat ic = 1.0F / cc; |
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| 98 | GLfloat ac = a * ic; |
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| 99 | GLfloat bc = b * ic; |
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| 100 | if (ac < 0.0F) ac = -ac; |
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| 101 | if (bc < 0.0F) bc = -bc; |
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| 102 | offset += MAX2(ac, bc) * ctx->Polygon.OffsetFactor; |
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| 103 | } |
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| 104 | offset *= ctx->MRD; |
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| 105 | /*printf("offset %g\n", offset);*/ |
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| 106 | } |
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| 107 | } |
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| 108 | |||
| 109 | if (mode == GL_POINT) { |
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| 110 | if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetPoint) { |
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| 111 | v[0]->win[2] += offset; |
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| 112 | v[1]->win[2] += offset; |
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| 113 | v[2]->win[2] += offset; |
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| 114 | } |
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| 115 | _swsetup_render_point_tri( ctx, e0, e1, e2, facing ); |
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| 116 | } else if (mode == GL_LINE) { |
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| 117 | if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetLine) { |
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| 118 | v[0]->win[2] += offset; |
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| 119 | v[1]->win[2] += offset; |
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| 120 | v[2]->win[2] += offset; |
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| 121 | } |
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| 122 | _swsetup_render_line_tri( ctx, e0, e1, e2, facing ); |
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| 123 | } else { |
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| 124 | if ((IND & SS_OFFSET_BIT) && ctx->Polygon.OffsetFill) { |
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| 125 | v[0]->win[2] += offset; |
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| 126 | v[1]->win[2] += offset; |
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| 127 | v[2]->win[2] += offset; |
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| 128 | } |
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| 129 | _swrast_Triangle( ctx, v[0], v[1], v[2] ); |
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| 130 | } |
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| 131 | |||
| 132 | if (IND & SS_OFFSET_BIT) { |
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| 133 | v[0]->win[2] = z[0]; |
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| 134 | v[1]->win[2] = z[1]; |
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| 135 | v[2]->win[2] = z[2]; |
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| 136 | } |
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| 137 | |||
| 138 | if (IND & SS_TWOSIDE_BIT) { |
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| 139 | if (facing == 1) { |
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| 140 | if (IND & SS_RGBA_BIT) { |
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| 141 | GLchan (*vbcolor)[4] = (GLchan (*)[4])VB->ColorPtr[0]->Ptr; |
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| 142 | SS_COLOR(v[0]->color, vbcolor[e0]); |
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| 143 | SS_COLOR(v[1]->color, vbcolor[e1]); |
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| 144 | SS_COLOR(v[2]->color, vbcolor[e2]); |
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| 145 | if (VB->SecondaryColorPtr[0]) { |
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| 146 | GLchan (*vbspec)[4] = (GLchan (*)[4])VB->SecondaryColorPtr[0]->Ptr; |
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| 147 | SS_SPEC(v[0]->specular, vbspec[e0]); |
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| 148 | SS_SPEC(v[1]->specular, vbspec[e1]); |
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| 149 | SS_SPEC(v[2]->specular, vbspec[e2]); |
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| 150 | } |
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| 151 | } else { |
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| 152 | GLuint *vbindex = VB->IndexPtr[0]->data; |
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| 153 | SS_IND(v[0]->index, vbindex[e0]); |
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| 154 | SS_IND(v[1]->index, vbindex[e1]); |
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| 155 | SS_IND(v[2]->index, vbindex[e2]); |
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| 156 | } |
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| 157 | } |
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| 158 | } |
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| 159 | } |
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| 160 | |||
| 161 | |||
| 162 | |||
| 163 | /* Need to fixup edgeflags when decomposing to triangles: |
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| 164 | */ |
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| 165 | static void TAG(quadfunc)( GLcontext *ctx, GLuint v0, |
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| 166 | GLuint v1, GLuint v2, GLuint v3 ) |
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| 167 | { |
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| 168 | if (IND & SS_UNFILLED_BIT) { |
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| 169 | struct vertex_buffer *VB = &TNL_CONTEXT(ctx)->vb; |
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| 170 | GLubyte ef1 = VB->EdgeFlag[v1]; |
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| 171 | GLubyte ef3 = VB->EdgeFlag[v3]; |
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| 172 | VB->EdgeFlag[v1] = 0; |
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| 173 | TAG(triangle)( ctx, v0, v1, v3 ); |
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| 174 | VB->EdgeFlag[v1] = ef1; |
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| 175 | VB->EdgeFlag[v3] = 0; |
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| 176 | TAG(triangle)( ctx, v1, v2, v3 ); |
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| 177 | VB->EdgeFlag[v3] = ef3; |
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| 178 | } else { |
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| 179 | TAG(triangle)( ctx, v0, v1, v3 ); |
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| 180 | TAG(triangle)( ctx, v1, v2, v3 ); |
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| 181 | } |
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| 182 | } |
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| 183 | |||
| 184 | |||
| 185 | |||
| 186 | |||
| 187 | static void TAG(init)( void ) |
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| 188 | { |
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| 189 | tri_tab[IND] = TAG(triangle); |
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| 190 | quad_tab[IND] = TAG(quadfunc); |
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| 191 | } |
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| 192 | |||
| 193 | |||
| 194 | #undef IND |
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| 195 | #undef TAG |