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7d68c639dd
Before this patch, clip planes didn't work properly in Mesa when using
vertex shaders, because Mesa assigned both gl_ClipVertex and
gl_Position to the same gl_vert_result (VERT_RESULT_HPOS). As a
result, backends couldn't distinguish between the two variables, so
any shader that wrote different values to them would fail to work
properly.
This patch paves the way for proper support of gl_ClipVertex by
creating a new enumerated value in gl_vert_result for it
(VERT_RESULT_CLIP_VERTEX). After this patch, a back-end may add
support for gl_ClipVertex using the following algorithm:
- If using a user-supplied GLSL vertex shader:
- If the bit corresponding to VERT_RESULT_CLIP_VERTEX is set in
gl_program::OutputsWritten:
- Clip using the vertex shader output VERT_RESULT_CLIP_VERTEX and
the clip planes defined in gl_context::Transform.EyeUserPlane.
- Else:
- Clip using the vertex shader output VERT_RESULT_HPOS and the
clip planes defined in gl_context::Transform.EyeUserPlane.
- Else (either using fixed function or an ARB vertex program):
- Clip using the vertex shader output VERT_RESULT_HPOS and the clip
planes defined in gl_context::Transform._ClipUserPlane (*)
where (*) represents the normal Mesa behavior before this patch.
An example of implementing the above algorithm can be found in the
patch that follows this one, which implements gl_ClipVertex in i965
Gen6.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
110 lines
5.2 KiB
C
110 lines
5.2 KiB
C
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "main/core.h" /* for slot numbers */
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struct builtin_variable {
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enum ir_variable_mode mode;
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int slot;
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const char *type;
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const char *name;
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};
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static const builtin_variable builtin_core_vs_variables[] = {
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{ ir_var_out, VERT_RESULT_HPOS, "vec4", "gl_Position" },
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{ ir_var_out, VERT_RESULT_PSIZ, "float", "gl_PointSize" },
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};
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static const builtin_variable builtin_core_fs_variables[] = {
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{ ir_var_in, FRAG_ATTRIB_WPOS, "vec4", "gl_FragCoord" },
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{ ir_var_in, FRAG_ATTRIB_FACE, "bool", "gl_FrontFacing" },
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{ ir_var_out, FRAG_RESULT_COLOR, "vec4", "gl_FragColor" },
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};
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static const builtin_variable builtin_100ES_fs_variables[] = {
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{ ir_var_in, FRAG_ATTRIB_PNTC, "vec2", "gl_PointCoord" },
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};
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static const builtin_variable builtin_110_fs_variables[] = {
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{ ir_var_out, FRAG_RESULT_DEPTH, "float", "gl_FragDepth" },
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};
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static const builtin_variable builtin_110_deprecated_fs_variables[] = {
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{ ir_var_in, FRAG_ATTRIB_COL0, "vec4", "gl_Color" },
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{ ir_var_in, FRAG_ATTRIB_COL1, "vec4", "gl_SecondaryColor" },
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{ ir_var_in, FRAG_ATTRIB_FOGC, "float", "gl_FogFragCoord" },
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};
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static const builtin_variable builtin_110_deprecated_vs_variables[] = {
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{ ir_var_in, VERT_ATTRIB_POS, "vec4", "gl_Vertex" },
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{ ir_var_in, VERT_ATTRIB_NORMAL, "vec3", "gl_Normal" },
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{ ir_var_in, VERT_ATTRIB_COLOR0, "vec4", "gl_Color" },
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{ ir_var_in, VERT_ATTRIB_COLOR1, "vec4", "gl_SecondaryColor" },
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{ ir_var_in, VERT_ATTRIB_TEX0, "vec4", "gl_MultiTexCoord0" },
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{ ir_var_in, VERT_ATTRIB_TEX1, "vec4", "gl_MultiTexCoord1" },
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{ ir_var_in, VERT_ATTRIB_TEX2, "vec4", "gl_MultiTexCoord2" },
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{ ir_var_in, VERT_ATTRIB_TEX3, "vec4", "gl_MultiTexCoord3" },
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{ ir_var_in, VERT_ATTRIB_TEX4, "vec4", "gl_MultiTexCoord4" },
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{ ir_var_in, VERT_ATTRIB_TEX5, "vec4", "gl_MultiTexCoord5" },
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{ ir_var_in, VERT_ATTRIB_TEX6, "vec4", "gl_MultiTexCoord6" },
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{ ir_var_in, VERT_ATTRIB_TEX7, "vec4", "gl_MultiTexCoord7" },
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{ ir_var_in, VERT_ATTRIB_FOG, "float", "gl_FogCoord" },
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{ ir_var_out, VERT_RESULT_CLIP_VERTEX, "vec4", "gl_ClipVertex" },
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{ ir_var_out, VERT_RESULT_COL0, "vec4", "gl_FrontColor" },
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{ ir_var_out, VERT_RESULT_BFC0, "vec4", "gl_BackColor" },
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{ ir_var_out, VERT_RESULT_COL1, "vec4", "gl_FrontSecondaryColor" },
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{ ir_var_out, VERT_RESULT_BFC1, "vec4", "gl_BackSecondaryColor" },
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{ ir_var_out, VERT_RESULT_FOGC, "float", "gl_FogFragCoord" },
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};
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static const builtin_variable builtin_120_fs_variables[] = {
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{ ir_var_in, FRAG_ATTRIB_PNTC, "vec2", "gl_PointCoord" },
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};
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static const builtin_variable builtin_130_vs_variables[] = {
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{ ir_var_in, -1, "int", "gl_VertexID" },
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};
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static const builtin_variable builtin_110_deprecated_uniforms[] = {
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewMatrix" },
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{ ir_var_uniform, -1, "mat4", "gl_ProjectionMatrix" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrix" },
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{ ir_var_uniform, -1, "mat3", "gl_NormalMatrix" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixInverse" },
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{ ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixInverse" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixInverse" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixTranspose" },
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{ ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixTranspose" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixTranspose" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewMatrixInverseTranspose" },
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{ ir_var_uniform, -1, "mat4", "gl_ProjectionMatrixInverseTranspose" },
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{ ir_var_uniform, -1, "mat4", "gl_ModelViewProjectionMatrixInverseTranspose" },
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{ ir_var_uniform, -1, "float", "gl_NormalScale" },
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{ ir_var_uniform, -1, "gl_LightModelParameters", "gl_LightModel"},
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/* Mesa-internal ATI_envmap_bumpmap state. */
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{ ir_var_uniform, -1, "vec2", "gl_MESABumpRotMatrix0"},
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{ ir_var_uniform, -1, "vec2", "gl_MESABumpRotMatrix1"},
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{ ir_var_uniform, -1, "vec4", "gl_MESAFogParamsOptimized"},
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};
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