Signed-off-by: Tobias Klausmann <tobias.johannes.klausm...@mni.thm.de>
---
src/glsl/ast_to_hir.cpp | 14 +++++
src/glsl/builtin_variables.cpp | 13 +++-
src/glsl/glcpp/glcpp-parse.y | 3 +
src/glsl/glsl_parser_extras.cpp | 1 +
src/glsl/glsl_parser_extras.h | 3 +
src/glsl/link_varyings.cpp | 2 +-
src/glsl/linker.cpp | 121
+++++++++++++++++++++++++-----------
src/glsl/standalone_scaffolding.cpp | 1 +
src/glsl/tests/varyings_test.cpp | 27 ++++++++
9 files changed, 145 insertions(+), 40 deletions(-)
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 8aebb13..4db2b2e 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -1045,6 +1045,20 @@ check_builtin_array_max_size(const char *name, unsigned
size,
_mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
"be larger than gl_MaxClipDistances (%u)",
state->Const.MaxClipPlanes);
+ } else if (strcmp("gl_CullDistance", name) == 0
+ && size > state->Const.MaxClipPlanes) {
+ /* From the ARB_cull_distance spec:
+ *
+ * "The gl_CullDistance array is predeclared as unsized and
+ * must be sized by the shader either redeclaring it with
+ * a size or indexing it only with integral constant
+ * expressions. The size determines the number and set of
+ * enabled cull distances and can be at most
+ * gl_MaxCullDistances."
+ */
+ _mesa_glsl_error(&loc, state, "`gl_CullDistance' array size cannot "
+ "be larger than gl_MaxCullDistances (%u)",
+ state->Const.MaxClipPlanes);
}
}
diff --git a/src/glsl/builtin_variables.cpp b/src/glsl/builtin_variables.cpp
index 6806aa1..78c8db2 100644
--- a/src/glsl/builtin_variables.cpp
+++ b/src/glsl/builtin_variables.cpp
@@ -298,7 +298,7 @@ public:
const glsl_type *construct_interface_instance() const;
private:
- glsl_struct_field fields[10];
+ glsl_struct_field fields[11];
unsigned num_fields;
};
@@ -600,6 +600,12 @@ builtin_variable_generator::generate_constants()
add_const("gl_MaxVaryingComponents", state->ctx->Const.MaxVarying * 4);
}
+ if (state->is_version(450, 0) || state->ARB_cull_distance_enable) {
+ add_const("gl_MaxCullDistances", state->Const.MaxClipPlanes);
+ add_const("gl_MaxCombinedClipAndCullDistances",
+ state->Const.MaxClipPlanes);
+ }
+
if (state->is_version(150, 0)) {
add_const("gl_MaxVertexOutputComponents",
state->Const.MaxVertexOutputComponents);
@@ -1029,6 +1035,11 @@ builtin_variable_generator::generate_varyings()
"gl_ClipDistance");
}
+ if (state->is_version(450, 0) || state->ARB_cull_distance_enable) {
+ ADD_VARYING(VARYING_SLOT_CULL_DIST0, array(float_t, 0),
+ "gl_CullDistance");
+ }
+
if (compatibility) {
ADD_VARYING(VARYING_SLOT_TEX0, array(vec4_t, 0), "gl_TexCoord");
ADD_VARYING(VARYING_SLOT_FOGC, float_t, "gl_FogFragCoord");
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index a11b6b2..536c17f 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -2483,6 +2483,9 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t
*parser, intmax_t versio
if (extensions->ARB_shader_precision)
add_builtin_define(parser, "GL_ARB_shader_precision", 1);
+
+ if (extensions->ARB_cull_distance)
+ add_builtin_define(parser, "GL_ARB_cull_distance", 1);
}
}
diff --git a/src/glsl/glsl_parser_extras.cpp b/src/glsl/glsl_parser_extras.cpp
index 046d5d7..d1cd8ff 100644
--- a/src/glsl/glsl_parser_extras.cpp
+++ b/src/glsl/glsl_parser_extras.cpp
@@ -554,6 +554,7 @@ static const _mesa_glsl_extension
_mesa_glsl_supported_extensions[] = {
EXT(ARB_arrays_of_arrays, true, false,
ARB_arrays_of_arrays),
EXT(ARB_compute_shader, true, false, ARB_compute_shader),
EXT(ARB_conservative_depth, true, false,
ARB_conservative_depth),
+ EXT(ARB_cull_distance, true, false, ARB_cull_distance),
EXT(ARB_derivative_control, true, false,
ARB_derivative_control),
EXT(ARB_draw_buffers, true, false, dummy_true),
EXT(ARB_draw_instanced, true, false, ARB_draw_instanced),
diff --git a/src/glsl/glsl_parser_extras.h b/src/glsl/glsl_parser_extras.h
index 9a0c24e..8572905 100644
--- a/src/glsl/glsl_parser_extras.h
+++ b/src/glsl/glsl_parser_extras.h
@@ -378,6 +378,7 @@ struct _mesa_glsl_parse_state {
/* ARB_viewport_array */
unsigned MaxViewports;
+
} Const;
/**
@@ -430,6 +431,8 @@ struct _mesa_glsl_parse_state {
bool ARB_compute_shader_warn;
bool ARB_conservative_depth_enable;
bool ARB_conservative_depth_warn;
+ bool ARB_cull_distance_enable;
+ bool ARB_cull_distance_warn;
bool ARB_derivative_control_enable;
bool ARB_derivative_control_warn;
bool ARB_draw_buffers_enable;
diff --git a/src/glsl/link_varyings.cpp b/src/glsl/link_varyings.cpp
index 46f84c6..81c0dac 100644
--- a/src/glsl/link_varyings.cpp
+++ b/src/glsl/link_varyings.cpp
@@ -404,7 +404,7 @@ tfeedback_decl::assign_location(struct gl_context *ctx,
this->matched_candidate->type->fields.array->vector_elements;
unsigned actual_array_size =
(this->is_clip_distance_mesa || this->is_cull_distance_mesa) ?
- prog->LastClipDistanceArraySize :
+ prog->LastClipCullDistanceArraySize :
this->matched_candidate->type->array_size();
if (this->is_subscripted) {
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index e616520..8bb1a5c 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -474,49 +474,94 @@ link_invalidate_variable_locations(exec_list *ir)
}
+
/**
- * Set UsesClipDistance and ClipDistanceArraySize based on the given shader.
+ * Set UsesClipCullDistance and ClipCullDistanceArraySize based on the given
+ * shader.
*
- * Also check for errors based on incorrect usage of gl_ClipVertex and
- * gl_ClipDistance.
+ * Also check for errors based on incorrect usage of gl_ClipVertex,
+ * gl_ClipDistance and gl_CullDistance.
+ *
+ * Additionally test whether the arrays gl_ClipDistance and gl_CullDistance
+ * exceed the maximum size defined by gl_MaxCombinedClipAndCullDistances.
*
* Return false if an error was reported.
*/
static void
-analyze_clip_usage(struct gl_shader_program *prog,
- struct gl_shader *shader, GLboolean *UsesClipDistance,
- GLuint *ClipDistanceArraySize)
+analyze_clip_cull_usage(struct gl_shader_program *prog,
+ struct gl_shader *shader,
+ struct gl_context *ctx,
+ GLboolean *UsesClipCullDistance,
+ GLuint *ClipCullDistanceArraySize)
{
- *ClipDistanceArraySize = 0;
+ *ClipCullDistanceArraySize = 0;
- if (!prog->IsES && prog->Version >= 130) {
- /* From section 7.1 (Vertex Shader Special Variables) of the
- * GLSL 1.30 spec:
- *
- * "It is an error for a shader to statically write both
- * gl_ClipVertex and gl_ClipDistance."
- *
- * This does not apply to GLSL ES shaders, since GLSL ES defines neither
- * gl_ClipVertex nor gl_ClipDistance.
- */
+ if (prog->IsES && prog->Version < 130) {
+ *UsesClipCullDistance = false;
+ } else {
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);
+
+ /* From the ARB_cull_distance spec:
+ *
+ * It is a compile-time or link-time error for the set of shaders forming
+ * a program to statically read or write both gl_ClipVertex and either
+ * gl_ClipDistance or gl_CullDistance.
+ *
+ * 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;
}
- *UsesClipDistance = clip_distance.variable_found();
+ 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;
+ }
+
+ *UsesClipCullDistance = clip_distance.variable_found() |
+ cull_distance.variable_found();
+
ir_variable *clip_distance_var =
shader->symbols->get_variable("gl_ClipDistance");
+ ir_variable *cull_distance_var =
+ shader->symbols->get_variable("gl_CullDistance");
+
if (clip_distance_var)
- *ClipDistanceArraySize = clip_distance_var->type->length;
- } else {
- *UsesClipDistance = false;
+ *ClipCullDistanceArraySize = clip_distance_var->type->was_unsized ?
+ clip_distance_var->type->length -1 :
+ clip_distance_var->type->length;
+
+ if (cull_distance_var)
+ *ClipCullDistanceArraySize+= cull_distance_var->type->was_unsized ?
+ cull_distance_var->type->length -1 :
+ cull_distance_var->type->length;
