[Mesa-dev] [PATCH] glsl: add EXT_clip_cull_distance support based on ARB_cull_distance
Ilia Mirkin
imirkin at alum.mit.edu
Tue May 24 01:42:18 UTC 2016
Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
src/compiler/glsl/builtin_variables.cpp | 12 +++++++----
src/compiler/glsl/glsl_parser_extras.cpp | 1 +
src/compiler/glsl/glsl_parser_extras.h | 2 ++
src/compiler/glsl/linker.cpp | 35 ++++++++++++++++++--------------
src/mesa/main/extensions_table.h | 1 +
5 files changed, 32 insertions(+), 19 deletions(-)
diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index e899f01..3d34028 100644
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -674,11 +674,14 @@ builtin_variable_generator::generate_constants()
state->Const.MaxProgramTexelOffset);
}
- if (state->is_version(130, 0)) {
+ if (state->is_version(130, 0) || state->EXT_clip_cull_distance_enable) {
add_const("gl_MaxClipDistances", state->Const.MaxClipPlanes);
+ }
+ if (state->is_version(130, 0)) {
add_const("gl_MaxVaryingComponents", state->ctx->Const.MaxVarying * 4);
}
- if (state->is_version(450, 0) || state->ARB_cull_distance_enable) {
+ if (state->is_version(450, 0) || state->ARB_cull_distance_enable ||
+ state->EXT_clip_cull_distance_enable) {
add_const("gl_MaxCullDistances", state->Const.MaxClipPlanes);
add_const("gl_MaxCombinedClipAndCullDistances",
state->Const.MaxClipPlanes);
@@ -1256,11 +1259,12 @@ builtin_variable_generator::generate_varyings()
}
}
- if (state->is_version(130, 0)) {
+ if (state->is_version(130, 0) || state->EXT_clip_cull_distance_enable) {
add_varying(VARYING_SLOT_CLIP_DIST0, array(float_t, 0),
"gl_ClipDistance");
}
- if (state->is_version(450, 0) || state->ARB_cull_distance_enable) {
+ if (state->is_version(450, 0) || state->ARB_cull_distance_enable ||
+ state->EXT_clip_cull_distance_enable) {
add_varying(VARYING_SLOT_CULL_DIST0, array(float_t, 0),
"gl_CullDistance");
}
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 2c42016..8b088ca 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -641,6 +641,7 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
EXT(AMD_vertex_shader_viewport_index, true, false, AMD_vertex_shader_viewport_index),
EXT(EXT_blend_func_extended, false, true, ARB_blend_func_extended),
EXT(EXT_draw_buffers, false, true, dummy_true),
+ EXT(EXT_clip_cull_distance, false, true, ARB_cull_distance),
EXT(EXT_geometry_point_size, false, true, OES_geometry_shader),
EXT(EXT_geometry_shader, false, true, OES_geometry_shader),
EXT(EXT_gpu_shader5, false, true, ARB_gpu_shader5),
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 59ae972..3afc9cb 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -641,6 +641,8 @@ struct _mesa_glsl_parse_state {
bool AMD_vertex_shader_viewport_index_warn;
bool EXT_blend_func_extended_enable;
bool EXT_blend_func_extended_warn;
+ bool EXT_clip_cull_distance_enable;
+ bool EXT_clip_cull_distance_warn;
bool EXT_draw_buffers_enable;
bool EXT_draw_buffers_warn;
bool EXT_geometry_point_size_enable;
diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index ca2f060..8cf2a95 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -661,7 +661,7 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
*clip_distance_array_size = 0;
*cull_distance_array_size = 0;
- if (!prog->IsES && prog->Version >= 130) {
+ if (prog->Version >= (prog->IsES ? 300 : 130)) {
/* From section 7.1 (Vertex Shader Special Variables) of the
* GLSL 1.30 spec:
*
@@ -669,13 +669,12 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
* gl_ClipVertex and gl_ClipDistance."
*
* This does not apply to GLSL ES shaders, since GLSL ES defines neither
- * gl_ClipVertex nor gl_ClipDistance.
+ * gl_ClipVertex nor gl_ClipDistance. However with
+ * GL_EXT_clip_cull_distance, this functionality is exposed in ES 3.0.
*/
- find_assignment_visitor clip_vertex("gl_ClipVertex");
find_assignment_visitor clip_distance("gl_ClipDistance");
find_assignment_visitor cull_distance("gl_CullDistance");
- clip_vertex.run(shader->ir);
clip_distance.run(shader->ir);
cull_distance.run(shader->ir);
@@ -688,17 +687,23 @@ analyze_clip_cull_usage(struct gl_shader_program *prog,
* This does not apply to GLSL ES shaders, since GLSL ES defines neither
* gl_ClipVertex, gl_ClipDistance or gl_CullDistance.
*/
- if (clip_vertex.variable_found() && clip_distance.variable_found()) {
- linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
- "and `gl_ClipDistance'\n",
- _mesa_shader_stage_to_string(shader->Stage));
- return;
- }
- if (clip_vertex.variable_found() && cull_distance.variable_found()) {
- linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
- "and `gl_CullDistance'\n",
- _mesa_shader_stage_to_string(shader->Stage));
- return;
+ if (!prog->IsES) {
+ find_assignment_visitor clip_vertex("gl_ClipVertex");
+
+ clip_vertex.run(shader->ir);
+
+ if (clip_vertex.variable_found() && clip_distance.variable_found()) {
+ linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
+ "and `gl_ClipDistance'\n",
+ _mesa_shader_stage_to_string(shader->Stage));
+ return;
+ }
+ if (clip_vertex.variable_found() && cull_distance.variable_found()) {
+ linker_error(prog, "%s shader writes to both `gl_ClipVertex' "
+ "and `gl_CullDistance'\n",
+ _mesa_shader_stage_to_string(shader->Stage));
+ return;
+ }
}
if (clip_distance.variable_found()) {
diff --git a/src/mesa/main/extensions_table.h b/src/mesa/main/extensions_table.h
index 296fbd8..716442e 100644
--- a/src/mesa/main/extensions_table.h
+++ b/src/mesa/main/extensions_table.h
@@ -189,6 +189,7 @@ EXT(EXT_blend_func_separate , EXT_blend_func_separate
EXT(EXT_blend_minmax , EXT_blend_minmax , GLL, x , ES1, ES2, 1995)
EXT(EXT_blend_subtract , dummy_true , GLL, x , x , x , 1995)
EXT(EXT_buffer_storage , ARB_buffer_storage , x , x , x , 31, 2015)
+EXT(EXT_clip_cull_distance , ARB_cull_distance , x , x , x , 30, 2016)
EXT(EXT_color_buffer_float , dummy_true , x , x , ES1, 30, 2013)
EXT(EXT_compiled_vertex_array , dummy_true , GLL, x , x , x , 1996)
EXT(EXT_copy_image , OES_copy_image , x , x , x , 30, 2014)
--
2.7.3
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