[Mesa-dev] [PATCH v3 13/14] glsl: add subroutine index qualifier support
Timothy Arceri
t_arceri at yahoo.com.au
Sat Nov 14 05:42:48 PST 2015
From: Timothy Arceri <timothy.arceri at collabora.com>
ARB_explicit_uniform_location allows the index for subroutine functions
to be explicitly set in the shader.
This patch reduces the restriction on the index qualifier in
validate_layout_qualifiers() to allow it to be applied to subroutines
and adds the new subroutine qualifier validation to ast_function::hir().
ast_fully_specified_type::has_qualifiers() is updated to allow the
index qualifier on subroutine functions when explicit uniform locations
is available.
A new check is added to ast_type_qualifier::merge_qualifier() to stop
multiple function qualifiers from being defied, before this patch this
would cause a segfault.
Finally a new variable is added to ir_function_signature to store the
index. This value is validated and the non explicit values assigned in
link_assign_subroutine_types().
---
src/glsl/ast.h | 2 +-
src/glsl/ast_to_hir.cpp | 34 ++++++++++++++++++++++++++++++++--
src/glsl/ast_type.cpp | 14 +++++++++++++-
src/glsl/ir.cpp | 1 +
src/glsl/ir.h | 2 ++
src/glsl/ir_clone.cpp | 1 +
src/glsl/linker.cpp | 33 +++++++++++++++++++++++++++++++++
src/mesa/main/mtypes.h | 1 +
src/mesa/main/shader_query.cpp | 7 +++++++
9 files changed, 91 insertions(+), 4 deletions(-)
diff --git a/src/glsl/ast.h b/src/glsl/ast.h
index bfeab6b..1e4a998 100644
--- a/src/glsl/ast.h
+++ b/src/glsl/ast.h
@@ -772,7 +772,7 @@ public:
class ast_fully_specified_type : public ast_node {
public:
virtual void print(void) const;
- bool has_qualifiers() const;
+ bool has_qualifiers(_mesa_glsl_parse_state *state) const;
ast_fully_specified_type() : qualifier(), specifier(NULL)
{
diff --git a/src/glsl/ast_to_hir.cpp b/src/glsl/ast_to_hir.cpp
index 6a3ec44..6c56829 100644
--- a/src/glsl/ast_to_hir.cpp
+++ b/src/glsl/ast_to_hir.cpp
@@ -2848,6 +2848,13 @@ apply_explicit_location(const struct ast_type_qualifier *qual,
break;
}
+ /* Check if index was set for the uniform instead of the function */
+ if (qual->flags.q.explicit_index && qual->flags.q.subroutine) {
+ _mesa_glsl_error(loc, state, "an index qualifier can only be "
+ "used with subroutine functions");
+ return;
+ }
+
unsigned qual_index;
if (qual->flags.q.explicit_index &&
process_qualifier_constant(state, loc, "index", qual->index,
@@ -3067,7 +3074,9 @@ apply_layout_qualifier_to_variable(const struct ast_type_qualifier *qual,
if (qual->flags.q.explicit_location) {
apply_explicit_location(qual, var, state, loc);
} else if (qual->flags.q.explicit_index) {
- _mesa_glsl_error(loc, state, "explicit index requires explicit location");
+ if (!qual->flags.q.subroutine_def)
+ _mesa_glsl_error(loc, state,
+ "explicit index requires explicit location");
}
if (qual->flags.q.explicit_binding) {
@@ -5075,7 +5084,7 @@ ast_function::hir(exec_list *instructions,
/* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
* "No qualifier is allowed on the return type of a function."
*/
- if (this->return_type->has_qualifiers()) {
+ if (this->return_type->has_qualifiers(state)) {
YYLTYPE loc = this->get_location();
_mesa_glsl_error(& loc, state,
"function `%s' return type has qualifiers", name);
@@ -5207,6 +5216,27 @@ ast_function::hir(exec_list *instructions,
if (this->return_type->qualifier.flags.q.subroutine_def) {
int idx;
+ if (this->return_type->qualifier.flags.q.explicit_index) {
+ unsigned qual_index;
+ if (process_qualifier_constant(state, &loc, "index",
+ this->return_type->qualifier.index,
+ &qual_index)) {
+ if (!state->has_explicit_uniform_location()) {
+ _mesa_glsl_error(&loc, state, "subroutine index requires "
+ "GL_ARB_explicit_uniform_location or "
+ "GLSL 4.30");
+ } else if (qual_index >= MAX_SUBROUTINES) {
+ _mesa_glsl_error(&loc, state,
+ "invalid subroutine index (%d) index must "
+ "be a number between 0 and "
+ "GL_MAX_SUBROUTINES - 1 (%d)", qual_index,
+ MAX_SUBROUTINES - 1);
+ } else {
+ f->subroutine_index = qual_index;
+ }
+ }
+ }
+
f->num_subroutine_types = this->return_type->qualifier.subroutine_list->declarations.length();
f->subroutine_types = ralloc_array(state, const struct glsl_type *,
f->num_subroutine_types);
diff --git a/src/glsl/ast_type.cpp b/src/glsl/ast_type.cpp
index 1e89a9e..03ed4dc 100644
--- a/src/glsl/ast_type.cpp
+++ b/src/glsl/ast_type.cpp
@@ -38,13 +38,16 @@ ast_type_specifier::print(void) const
}
bool
-ast_fully_specified_type::has_qualifiers() const
+ast_fully_specified_type::has_qualifiers(_mesa_glsl_parse_state *state) const
{
/* 'subroutine' isnt a real qualifier. */
ast_type_qualifier subroutine_only;
subroutine_only.flags.i = 0;
subroutine_only.flags.q.subroutine = 1;
subroutine_only.flags.q.subroutine_def = 1;
+ if (state->has_explicit_uniform_location()) {
+ subroutine_only.flags.q.explicit_index = 1;
+ }
return (this->qualifier.flags.i & ~subroutine_only.flags.i) != 0;
}
@@ -176,6 +179,15 @@ ast_type_qualifier::merge_qualifier(YYLTYPE *loc,
}
}
+ if (q.flags.q.subroutine_def) {
+ if (this->flags.q.subroutine_def) {
+ _mesa_glsl_error(loc, state,
+ "conflicting subroutine qualifiers used");
+ } else {
+ this->subroutine_list = q.subroutine_list;
+ }
+ }
+
if (q.flags.q.invocations) {
if (this->invocations) {
this->invocations->merge_qualifier(q.invocations);
diff --git a/src/glsl/ir.cpp b/src/glsl/ir.cpp
index 8933b23..edd2818 100644
--- a/src/glsl/ir.cpp
+++ b/src/glsl/ir.cpp
@@ -1842,6 +1842,7 @@ ir_function_signature::replace_parameters(exec_list *new_params)
ir_function::ir_function(const char *name)
: ir_instruction(ir_type_function)
{
+ this->subroutine_index = -1;
this->name = ralloc_strdup(this, name);
}
diff --git a/src/glsl/ir.h b/src/glsl/ir.h
index d59dee1..a0dfd41 100644
--- a/src/glsl/ir.h
+++ b/src/glsl/ir.h
@@ -1171,6 +1171,8 @@ public:
*/
int num_subroutine_types;
const struct glsl_type **subroutine_types;
+
+ int subroutine_index;
};
inline const char *ir_function_signature::function_name() const
diff --git a/src/glsl/ir_clone.cpp b/src/glsl/ir_clone.cpp
index a2cd672..ea8fbd2 100644
--- a/src/glsl/ir_clone.cpp
+++ b/src/glsl/ir_clone.cpp
@@ -269,6 +269,7 @@ ir_function::clone(void *mem_ctx, struct hash_table *ht) const
ir_function *copy = new(mem_ctx) ir_function(this->name);
copy->is_subroutine = this->is_subroutine;
+ copy->subroutine_index = this->subroutine_index;
copy->num_subroutine_types = this->num_subroutine_types;
copy->subroutine_types = ralloc_array(mem_ctx, const struct glsl_type *, copy->num_subroutine_types);
for (int i = 0; i < copy->num_subroutine_types; i++)
diff --git a/src/glsl/linker.cpp b/src/glsl/linker.cpp
index db00f8f..331d9a2 100644
--- a/src/glsl/linker.cpp
+++ b/src/glsl/linker.cpp
@@ -3864,10 +3864,43 @@ link_assign_subroutine_types(struct gl_shader_program *prog)
sh->SubroutineFunctions[sh->NumSubroutineFunctions].types =
ralloc_array(sh, const struct glsl_type *,
fn->num_subroutine_types);
+
+ /* From Section 4.4.4(Subroutine Function Layout Qualifiers) of the
+ * GLSL 4.5 spec:
+ *
+ * "Each subroutine with an index qualifier in the shader must be
+ * given a unique index, otherwise a compile or link error will be
+ * generated."
+ */
+ for (unsigned j = 0; j < sh->NumSubroutineFunctions; j++) {
+ if (sh->SubroutineFunctions[j].index != -1 &&
+ sh->SubroutineFunctions[j].index == fn->subroutine_index) {
+ linker_error(prog, "each subroutine index qualifier in the "
+ "shader must be unique\n");
+ return;
+ }
+ }
+ sh->SubroutineFunctions[sh->NumSubroutineFunctions].index =
+ fn->subroutine_index;
+
for (int j = 0; j < fn->num_subroutine_types; j++)
sh->SubroutineFunctions[sh->NumSubroutineFunctions].types[j] = fn->subroutine_types[j];
sh->NumSubroutineFunctions++;
}
+
+ /* Assign index for subroutines without an explicit index*/
+ int index = 0;
+ for (unsigned j = 0; j < sh->NumSubroutineFunctions; j++) {
+ while (sh->SubroutineFunctions[j].index == -1) {
+ for (unsigned k = 0; k < sh->NumSubroutineFunctions; k++) {
+ if (sh->SubroutineFunctions[k].index == index)
+ break;
+ else if (k == sh->NumSubroutineFunctions - 1)
+ sh->SubroutineFunctions[j].index = index;
+ }
+ index++;
+ }
+ }
}
}
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 4efdf1e..66820ca 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2193,6 +2193,7 @@ struct gl_ati_fragment_shader_state
struct gl_subroutine_function
{
char *name;
+ int index;
int num_compat_types;
const struct glsl_type **types;
};
diff --git a/src/mesa/main/shader_query.cpp b/src/mesa/main/shader_query.cpp
index 58ba041..4b23c3a 100644
--- a/src/mesa/main/shader_query.cpp
+++ b/src/mesa/main/shader_query.cpp
@@ -661,6 +661,13 @@ _mesa_program_resource_index(struct gl_shader_program *shProg,
switch (res->Type) {
case GL_ATOMIC_COUNTER_BUFFER:
return RESOURCE_ATC(res) - shProg->AtomicBuffers;
+ case GL_VERTEX_SUBROUTINE:
+ case GL_GEOMETRY_SUBROUTINE:
+ case GL_FRAGMENT_SUBROUTINE:
+ case GL_COMPUTE_SUBROUTINE:
+ case GL_TESS_CONTROL_SUBROUTINE:
+ case GL_TESS_EVALUATION_SUBROUTINE:
+ return RESOURCE_SUB(res)->index;
case GL_UNIFORM_BLOCK:
case GL_SHADER_STORAGE_BLOCK:
case GL_TRANSFORM_FEEDBACK_VARYING:
--
2.4.3
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