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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 55 | pj | 1 | /* $Id: buffers.c,v 1.1 2003-02-28 11:41:58 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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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 | #include "glheader.h" |
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| 29 | #include "imports.h" |
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| 30 | #include "accum.h" |
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| 31 | #include "buffers.h" |
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| 32 | #include "colormac.h" |
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| 33 | #include "context.h" |
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| 34 | #include "depth.h" |
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| 35 | #include "enums.h" |
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| 36 | #include "macros.h" |
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| 37 | #include "stencil.h" |
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| 38 | #include "state.h" |
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| 39 | #include "mtypes.h" |
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| 40 | |||
| 41 | |||
| 42 | |||
| 43 | void |
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| 44 | _mesa_ClearIndex( GLfloat c ) |
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| 45 | { |
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| 46 | GET_CURRENT_CONTEXT(ctx); |
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| 47 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 48 | |||
| 49 | if (ctx->Color.ClearIndex == (GLuint) c) |
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| 50 | return; |
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| 51 | |||
| 52 | FLUSH_VERTICES(ctx, _NEW_COLOR); |
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| 53 | ctx->Color.ClearIndex = (GLuint) c; |
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| 54 | |||
| 55 | if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) { |
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| 56 | /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */ |
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| 57 | (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex ); |
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| 58 | } |
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| 59 | } |
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| 60 | |||
| 61 | |||
| 62 | |||
| 63 | void |
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| 64 | _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha ) |
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| 65 | { |
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| 66 | GLfloat tmp[4]; |
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| 67 | GET_CURRENT_CONTEXT(ctx); |
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| 68 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 69 | |||
| 70 | tmp[0] = CLAMP(red, 0.0F, 1.0F); |
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| 71 | tmp[1] = CLAMP(green, 0.0F, 1.0F); |
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| 72 | tmp[2] = CLAMP(blue, 0.0F, 1.0F); |
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| 73 | tmp[3] = CLAMP(alpha, 0.0F, 1.0F); |
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| 74 | |||
| 75 | if (TEST_EQ_4V(tmp, ctx->Color.ClearColor)) |
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| 76 | return; /* no change */ |
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| 77 | |||
| 78 | FLUSH_VERTICES(ctx, _NEW_COLOR); |
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| 79 | COPY_4V(ctx->Color.ClearColor, tmp); |
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| 80 | |||
| 81 | if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) { |
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| 82 | /* it's OK to call glClearColor in CI mode but it should be a NOP */ |
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| 83 | (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor); |
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| 84 | } |
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| 85 | } |
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| 86 | |||
| 87 | |||
| 88 | |||
| 89 | void |
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| 90 | _mesa_Clear( GLbitfield mask ) |
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| 91 | { |
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| 92 | GET_CURRENT_CONTEXT(ctx); |
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| 93 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); |
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| 94 | |||
| 95 | if (MESA_VERBOSE & VERBOSE_API) |
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| 96 | _mesa_debug(ctx, "glClear 0x%x\n", mask); |
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| 97 | |||
| 98 | if (mask & ~(GL_COLOR_BUFFER_BIT | |
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| 99 | GL_DEPTH_BUFFER_BIT | |
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| 100 | GL_STENCIL_BUFFER_BIT | |
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| 101 | GL_ACCUM_BUFFER_BIT)) { |
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| 102 | /* invalid bit set */ |
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| 103 | _mesa_error( ctx, GL_INVALID_VALUE, "glClear(mask)"); |
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| 104 | return; |
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| 105 | } |
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| 106 | |||
| 107 | if (ctx->NewState) { |
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| 108 | _mesa_update_state( ctx ); /* update _Xmin, etc */ |
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| 109 | } |
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| 110 | |||
| 111 | if (ctx->RenderMode==GL_RENDER) { |
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| 112 | const GLint x = ctx->DrawBuffer->_Xmin; |
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| 113 | const GLint y = ctx->DrawBuffer->_Ymin; |
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| 114 | const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin; |
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| 115 | const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin; |
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| 116 | GLbitfield ddMask; |
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| 117 | |||
| 118 | /* don't clear depth buffer if depth writing disabled */ |
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| 119 | if (!ctx->Depth.Mask) |
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| 120 | mask &= ~GL_DEPTH_BUFFER_BIT; |
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| 121 | |||
| 122 | /* Build bitmask to send to driver Clear function */ |
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| 123 | ddMask = mask & (GL_DEPTH_BUFFER_BIT | |
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| 124 | GL_STENCIL_BUFFER_BIT | |
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| 125 | GL_ACCUM_BUFFER_BIT); |
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| 126 | if (mask & GL_COLOR_BUFFER_BIT) { |
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| 127 | ddMask |= ctx->Color._DrawDestMask; |
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| 128 | } |
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| 129 | |||
| 130 | ASSERT(ctx->Driver.Clear); |
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| 131 | ctx->Driver.Clear( ctx, ddMask, (GLboolean) !ctx->Scissor.Enabled, |
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| 132 | x, y, width, height ); |
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| 133 | } |
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| 134 | } |
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| 135 | |||
| 136 | |||
| 137 | void |
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| 138 | _mesa_DrawBuffer( GLenum mode ) |
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| 139 | { |
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| 140 | GET_CURRENT_CONTEXT(ctx); |
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| 141 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */ |
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| 142 | |||
| 143 | if (MESA_VERBOSE & VERBOSE_API) |
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| 144 | _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); |
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| 145 | |||
| 146 | /* |
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| 147 | * Do error checking and compute the _DrawDestMask bitfield. |
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| 148 | */ |
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| 149 | switch (mode) { |
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| 150 | case GL_RIGHT: |
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| 151 | if (!ctx->Visual.stereoMode) { |
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| 152 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 153 | return;} |
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| 154 | if (ctx->Visual.doubleBufferMode) |
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| 155 | ctx->Color._DrawDestMask = FRONT_RIGHT_BIT | BACK_RIGHT_BIT; |
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| 156 | else |
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| 157 | ctx->Color._DrawDestMask = FRONT_RIGHT_BIT; |
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| 158 | break; |
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| 159 | case GL_FRONT_RIGHT: |
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| 160 | if (!ctx->Visual.stereoMode) { |
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| 161 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 162 | return; |
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| 163 | } |
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| 164 | ctx->Color._DrawDestMask = FRONT_RIGHT_BIT; |
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| 165 | break; |
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| 166 | case GL_BACK_RIGHT: |
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| 167 | if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { |
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| 168 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 169 | return; |
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| 170 | } |
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| 171 | ctx->Color._DrawDestMask = BACK_RIGHT_BIT; |
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| 172 | break; |
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| 173 | case GL_BACK_LEFT: |
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| 174 | if (!ctx->Visual.doubleBufferMode) { |
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| 175 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 176 | return; |
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| 177 | } |
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| 178 | ctx->Color._DrawDestMask = BACK_LEFT_BIT; |
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| 179 | break; |
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| 180 | case GL_FRONT_AND_BACK: |
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| 181 | if (!ctx->Visual.doubleBufferMode) { |
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| 182 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 183 | return; |
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| 184 | } |
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| 185 | if (ctx->Visual.stereoMode) |
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| 186 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT |
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| 187 | | FRONT_RIGHT_BIT | BACK_RIGHT_BIT; |
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| 188 | else |
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| 189 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; |
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| 190 | break; |
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| 191 | case GL_BACK: |
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| 192 | if (!ctx->Visual.doubleBufferMode) { |
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| 193 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer" ); |
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| 194 | return; |
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| 195 | } |
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| 196 | if (ctx->Visual.stereoMode) |
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| 197 | ctx->Color._DrawDestMask = BACK_LEFT_BIT | BACK_RIGHT_BIT; |
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| 198 | else |
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| 199 | ctx->Color._DrawDestMask = BACK_LEFT_BIT; |
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| 200 | break; |
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| 201 | case GL_LEFT: |
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| 202 | /* never an error */ |
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| 203 | if (ctx->Visual.doubleBufferMode) |
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| 204 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT | BACK_LEFT_BIT; |
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| 205 | else |
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| 206 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT; |
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| 207 | break; |
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| 208 | case GL_FRONT_LEFT: |
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| 209 | /* never an error */ |
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| 210 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT; |
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| 211 | break; |
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| 212 | case GL_FRONT: |
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| 213 | /* never an error */ |
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| 214 | if (ctx->Visual.stereoMode) |
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| 215 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT | FRONT_RIGHT_BIT; |
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| 216 | else |
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| 217 | ctx->Color._DrawDestMask = FRONT_LEFT_BIT; |
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| 218 | break; |
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| 219 | case GL_NONE: |
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| 220 | /* never an error */ |
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| 221 | ctx->Color._DrawDestMask = 0; |
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| 222 | break; |
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| 223 | case GL_AUX0: |
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| 224 | if (ctx->Const.NumAuxBuffers >= 1) { |
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| 225 | ctx->Color._DrawDestMask = AUX0_BIT; |
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| 226 | } |
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| 227 | else { |
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| 228 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX0)" ); |
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| 229 | return; |
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| 230 | } |
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| 231 | break; |
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| 232 | case GL_AUX1: |
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| 233 | if (ctx->Const.NumAuxBuffers >= 2) { |
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| 234 | ctx->Color._DrawDestMask = AUX1_BIT; |
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| 235 | } |
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| 236 | else { |
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| 237 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX1)" ); |
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| 238 | return; |
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| 239 | } |
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| 240 | break; |
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| 241 | case GL_AUX2: |
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| 242 | if (ctx->Const.NumAuxBuffers >= 3) { |
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| 243 | ctx->Color._DrawDestMask = AUX2_BIT; |
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| 244 | } |
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| 245 | else { |
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| 246 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX2)" ); |
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| 247 | return; |
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| 248 | } |
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| 249 | break; |
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| 250 | case GL_AUX3: |
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| 251 | if (ctx->Const.NumAuxBuffers >= 4) { |
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| 252 | ctx->Color._DrawDestMask = AUX3_BIT; |
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| 253 | } |
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| 254 | else { |
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| 255 | _mesa_error( ctx, GL_INVALID_OPERATION, "glDrawBuffer(GL_AUX3)" ); |
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| 256 | return; |
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| 257 | } |
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| 258 | break; |
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| 259 | default: |
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| 260 | _mesa_error( ctx, GL_INVALID_ENUM, "glDrawBuffer" ); |
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| 261 | return; |
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| 262 | } |
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| 263 | |||
| 264 | ctx->Color.DrawBuffer = mode; |
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| 265 | ctx->NewState |= _NEW_COLOR; |
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| 266 | |||
| 267 | /* |
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| 268 | * Call device driver function. |
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| 269 | */ |
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| 270 | if (ctx->Driver.DrawBuffer) |
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| 271 | (*ctx->Driver.DrawBuffer)(ctx, mode); |
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| 272 | } |
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| 273 | |||
| 274 | |||
| 275 | |||
| 276 | void |
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| 277 | _mesa_ReadBuffer( GLenum mode ) |
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| 278 | { |
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| 279 | GET_CURRENT_CONTEXT(ctx); |
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| 280 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); |
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| 281 | |||
| 282 | if (MESA_VERBOSE & VERBOSE_API) |
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| 283 | _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(mode)); |
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| 284 | |||
| 285 | /* |
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| 286 | * Do error checking and compute ctx->Pixel._ReadSrcMask. |
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| 287 | */ |
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| 288 | switch (mode) { |
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| 289 | case GL_LEFT: |
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| 290 | case GL_FRONT: |
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| 291 | case GL_FRONT_LEFT: |
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| 292 | /* Front-Left buffer, always exists */ |
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| 293 | ctx->Pixel._ReadSrcMask = FRONT_LEFT_BIT; |
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| 294 | break; |
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| 295 | case GL_BACK: |
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| 296 | case GL_BACK_LEFT: |
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| 297 | /* Back-Left buffer, requires double buffering */ |
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| 298 | if (!ctx->Visual.doubleBufferMode) { |
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| 299 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); |
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| 300 | return; |
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| 301 | } |
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| 302 | ctx->Pixel._ReadSrcMask = BACK_LEFT_BIT; |
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| 303 | break; |
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| 304 | case GL_FRONT_RIGHT: |
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| 305 | case GL_RIGHT: |
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| 306 | if (!ctx->Visual.stereoMode) { |
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| 307 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); |
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| 308 | return; |
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| 309 | } |
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| 310 | ctx->Pixel._ReadSrcMask = FRONT_RIGHT_BIT; |
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| 311 | break; |
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| 312 | case GL_BACK_RIGHT: |
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| 313 | if (!ctx->Visual.stereoMode || !ctx->Visual.doubleBufferMode) { |
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| 314 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer" ); |
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| 315 | return; |
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| 316 | } |
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| 317 | ctx->Pixel._ReadSrcMask = BACK_RIGHT_BIT; |
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| 318 | break; |
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| 319 | case GL_AUX0: |
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| 320 | if (ctx->Const.NumAuxBuffers >= 1) { |
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| 321 | ctx->Pixel._ReadSrcMask = AUX0_BIT; |
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| 322 | } |
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| 323 | else { |
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| 324 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX0)" ); |
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| 325 | return; |
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| 326 | } |
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| 327 | break; |
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| 328 | case GL_AUX1: |
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| 329 | if (ctx->Const.NumAuxBuffers >= 2) { |
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| 330 | ctx->Pixel._ReadSrcMask = AUX1_BIT; |
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| 331 | } |
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| 332 | else { |
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| 333 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX1)" ); |
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| 334 | return; |
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| 335 | } |
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| 336 | break; |
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| 337 | case GL_AUX2: |
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| 338 | if (ctx->Const.NumAuxBuffers >= 3) { |
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| 339 | ctx->Pixel._ReadSrcMask = AUX2_BIT; |
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| 340 | } |
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| 341 | else { |
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| 342 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX2)" ); |
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| 343 | return; |
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| 344 | } |
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| 345 | break; |
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| 346 | case GL_AUX3: |
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| 347 | if (ctx->Const.NumAuxBuffers >= 4) { |
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| 348 | ctx->Pixel._ReadSrcMask = AUX3_BIT; |
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| 349 | } |
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| 350 | else { |
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| 351 | _mesa_error( ctx, GL_INVALID_OPERATION, "glReadBuffer(GL_AUX3)" ); |
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| 352 | return; |
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| 353 | } |
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| 354 | break; |
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| 355 | default: |
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| 356 | _mesa_error( ctx, GL_INVALID_ENUM, "glReadBuffer" ); |
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| 357 | return; |
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| 358 | } |
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| 359 | |||
| 360 | ctx->Pixel.ReadBuffer = mode; |
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| 361 | ctx->NewState |= _NEW_PIXEL; |
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| 362 | |||
| 363 | /* |
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| 364 | * Call device driver function. |
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| 365 | */ |
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| 366 | if (ctx->Driver.ReadBuffer) |
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| 367 | (*ctx->Driver.ReadBuffer)(ctx, mode); |
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| 368 | } |
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| 369 | |||
| 370 | |||
| 371 | /* |
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| 372 | * GL_MESA_resize_buffers extension |
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| 373 | * When this function is called, we'll ask the window system how large |
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| 374 | * the current window is. If it's not what we expect, we'll have to |
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| 375 | * resize/reallocate the software accum/stencil/depth/alpha buffers. |
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| 376 | */ |
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| 377 | void |
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| 378 | _mesa_ResizeBuffersMESA( void ) |
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| 379 | { |
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| 380 | GLcontext *ctx = _mesa_get_current_context(); |
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| 381 | |||
| 382 | if (MESA_VERBOSE & VERBOSE_API) |
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| 383 | _mesa_debug(ctx, "glResizeBuffersMESA\n"); |
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| 384 | |||
| 385 | if (ctx) { |
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| 386 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); |
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| 387 | |||
| 388 | if (ctx->DrawBuffer) { |
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| 389 | GLuint buf_width, buf_height; |
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| 390 | GLframebuffer *buffer = ctx->DrawBuffer; |
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| 391 | |||
| 392 | /* ask device driver for size of output buffer */ |
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| 393 | (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height ); |
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| 394 | |||
| 395 | /* see if size of device driver's color buffer (window) has changed */ |
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| 396 | if (buffer->Width == buf_width && buffer->Height == buf_height) |
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| 397 | return; /* size is as expected */ |
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| 398 | |||
| 399 | buffer->Width = buf_width; |
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| 400 | buffer->Height = buf_height; |
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| 401 | |||
| 402 | ctx->Driver.ResizeBuffers( buffer ); |
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| 403 | } |
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| 404 | |||
| 405 | if (ctx->ReadBuffer && ctx->ReadBuffer != ctx->DrawBuffer) { |
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| 406 | GLuint buf_width, buf_height; |
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| 407 | GLframebuffer *buffer = ctx->DrawBuffer; |
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| 408 | |||
| 409 | /* ask device driver for size of output buffer */ |
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| 410 | (*ctx->Driver.GetBufferSize)( buffer, &buf_width, &buf_height ); |
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| 411 | |||
| 412 | /* see if size of device driver's color buffer (window) has changed */ |
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| 413 | if (buffer->Width == buf_width && buffer->Height == buf_height) |
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| 414 | return; /* size is as expected */ |
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| 415 | |||
| 416 | buffer->Width = buf_width; |
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| 417 | buffer->Height = buf_height; |
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| 418 | |||
| 419 | ctx->Driver.ResizeBuffers( buffer ); |
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| 420 | } |
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| 421 | |||
| 422 | ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */ |
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| 423 | } |
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| 424 | } |
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| 425 | |||
| 426 | |||
| 427 | void |
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| 428 | _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height ) |
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| 429 | { |
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| 430 | GET_CURRENT_CONTEXT(ctx); |
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| 431 | ASSERT_OUTSIDE_BEGIN_END(ctx); |
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| 432 | |||
| 433 | if (width < 0 || height < 0) { |
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| 434 | _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" ); |
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| 435 | return; |
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| 436 | } |
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| 437 | |||
| 438 | if (MESA_VERBOSE & VERBOSE_API) |
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| 439 | _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height); |
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| 440 | |||
| 441 | if (x == ctx->Scissor.X && |
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| 442 | y == ctx->Scissor.Y && |
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| 443 | width == ctx->Scissor.Width && |
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| 444 | height == ctx->Scissor.Height) |
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| 445 | return; |
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| 446 | |||
| 447 | FLUSH_VERTICES(ctx, _NEW_SCISSOR); |
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| 448 | ctx->Scissor.X = x; |
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| 449 | ctx->Scissor.Y = y; |
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| 450 | ctx->Scissor.Width = width; |
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| 451 | ctx->Scissor.Height = height; |
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| 452 | |||
| 453 | if (ctx->Driver.Scissor) |
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| 454 | ctx->Driver.Scissor( ctx, x, y, width, height ); |
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| 455 | } |
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| 456 | |||
| 457 | |||
| 458 | /* |
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| 459 | * XXX move somewhere else someday? |
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| 460 | */ |
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| 461 | void |
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| 462 | _mesa_SampleCoverageARB(GLclampf value, GLboolean invert) |
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| 463 | { |
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| 464 | GLcontext *ctx = _mesa_get_current_context(); |
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| 465 | |||
| 466 | if (!ctx->Extensions.ARB_multisample) { |
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| 467 | _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB"); |
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| 468 | return; |
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| 469 | } |
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| 470 | |||
| 471 | ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx ); |
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| 472 | ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0); |
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| 473 | ctx->Multisample.SampleCoverageInvert = invert; |
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| 474 | ctx->NewState |= _NEW_MULTISAMPLE; |
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| 475 | } |
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| 476 |