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-rw-r--r--mesalib/src/glsl/Makefile.sources1
-rw-r--r--mesalib/src/glsl/ast_to_hir.cpp2
-rw-r--r--mesalib/src/glsl/glsl_lexer.ll2
-rw-r--r--mesalib/src/glsl/glsl_parser.yy4
-rw-r--r--mesalib/src/glsl/ir_optimization.h1
-rw-r--r--mesalib/src/glsl/linker.cpp167
-rw-r--r--mesalib/src/glsl/lower_output_reads.cpp141
7 files changed, 262 insertions, 56 deletions
diff --git a/mesalib/src/glsl/Makefile.sources b/mesalib/src/glsl/Makefile.sources
index c65bfe4ff..5e80af297 100644
--- a/mesalib/src/glsl/Makefile.sources
+++ b/mesalib/src/glsl/Makefile.sources
@@ -60,6 +60,7 @@ LIBGLSL_CXX_SOURCES := \
lower_vec_index_to_cond_assign.cpp \
lower_vec_index_to_swizzle.cpp \
lower_vector.cpp \
+ lower_output_reads.cpp \
opt_algebraic.cpp \
opt_constant_folding.cpp \
opt_constant_propagation.cpp \
diff --git a/mesalib/src/glsl/ast_to_hir.cpp b/mesalib/src/glsl/ast_to_hir.cpp
index d5b04e9d7..f0c921875 100644
--- a/mesalib/src/glsl/ast_to_hir.cpp
+++ b/mesalib/src/glsl/ast_to_hir.cpp
@@ -1184,7 +1184,7 @@ ast_expression::hir(exec_list *instructions,
error_emitted = true;
}
- type = op[0]->type;
+ type = error_emitted ? glsl_type::error_type : op[0]->type;
result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
break;
diff --git a/mesalib/src/glsl/glsl_lexer.ll b/mesalib/src/glsl/glsl_lexer.ll
index c7cfedd42..936a90726 100644
--- a/mesalib/src/glsl/glsl_lexer.ll
+++ b/mesalib/src/glsl/glsl_lexer.ll
@@ -148,7 +148,7 @@ HASH ^{SPC}#{SPC}
/* Preprocessor tokens. */
^[ \t]*#[ \t]*$ ;
-^[ \t]*#[ \t]*version { BEGIN PP; return VERSION; }
+^[ \t]*#[ \t]*version { BEGIN PP; return VERSION_TOK; }
^[ \t]*#[ \t]*extension { BEGIN PP; return EXTENSION; }
{HASH}line{SPCP}{INT}{SPCP}{INT}{SPC}$ {
/* Eat characters until the first digit is
diff --git a/mesalib/src/glsl/glsl_parser.yy b/mesalib/src/glsl/glsl_parser.yy
index 8a0377f49..e774b4697 100644
--- a/mesalib/src/glsl/glsl_parser.yy
+++ b/mesalib/src/glsl/glsl_parser.yy
@@ -118,7 +118,7 @@ static void yyerror(YYLTYPE *loc, _mesa_glsl_parse_state *st, const char *msg)
%token INVARIANT
%token LOWP MEDIUMP HIGHP SUPERP PRECISION
-%token VERSION EXTENSION LINE COLON EOL INTERFACE OUTPUT
+%token VERSION_TOK EXTENSION LINE COLON EOL INTERFACE OUTPUT
%token PRAGMA_DEBUG_ON PRAGMA_DEBUG_OFF
%token PRAGMA_OPTIMIZE_ON PRAGMA_OPTIMIZE_OFF
%token PRAGMA_INVARIANT_ALL
@@ -246,7 +246,7 @@ translation_unit:
version_statement:
/* blank - no #version specified: defaults are already set */
- | VERSION INTCONSTANT EOL
+ | VERSION_TOK INTCONSTANT EOL
{
bool supported = false;
diff --git a/mesalib/src/glsl/ir_optimization.h b/mesalib/src/glsl/ir_optimization.h
index 7b32e84f0..085b96903 100644
--- a/mesalib/src/glsl/ir_optimization.h
+++ b/mesalib/src/glsl/ir_optimization.h
@@ -72,6 +72,7 @@ bool lower_variable_index_to_cond_assign(exec_list *instructions,
bool lower_input, bool lower_output, bool lower_temp, bool lower_uniform);
bool lower_quadop_vector(exec_list *instructions, bool dont_lower_swz);
bool lower_clip_distance(exec_list *instructions);
+void lower_output_reads(exec_list *instructions);
bool optimize_redundant_jumps(exec_list *instructions);
ir_rvalue *
diff --git a/mesalib/src/glsl/linker.cpp b/mesalib/src/glsl/linker.cpp
index 65870087b..88c81c41b 100644
--- a/mesalib/src/glsl/linker.cpp
+++ b/mesalib/src/glsl/linker.cpp
@@ -1376,13 +1376,14 @@ demote_shader_inputs_and_outputs(gl_shader *sh, enum ir_variable_mode mode)
class tfeedback_decl
{
public:
- bool init(struct gl_shader_program *prog, const void *mem_ctx,
- const char *input);
+ bool init(struct gl_context *ctx, struct gl_shader_program *prog,
+ const void *mem_ctx, const char *input);
static bool is_same(const tfeedback_decl &x, const tfeedback_decl &y);
bool assign_location(struct gl_context *ctx, struct gl_shader_program *prog,
ir_variable *output_var);
bool store(struct gl_shader_program *prog,
- struct gl_transform_feedback_info *info, unsigned buffer) const;
+ struct gl_transform_feedback_info *info, unsigned buffer,
+ unsigned varying) const;
/**
@@ -1413,24 +1414,31 @@ public:
private:
/**
* The name that was supplied to glTransformFeedbackVaryings. Used for
- * error reporting.
+ * error reporting and glGetTransformFeedbackVarying().
*/
const char *orig_name;
/**
* The name of the variable, parsed from orig_name.
*/
- char *var_name;
+ const char *var_name;
/**
* True if the declaration in orig_name represents an array.
*/
- bool is_array;
+ bool is_subscripted;
/**
- * If is_array is true, the array index that was specified in orig_name.
+ * If is_subscripted is true, the subscript that was specified in orig_name.
*/
- unsigned array_index;
+ unsigned array_subscript;
+
+ /**
+ * Which component to extract from the vertex shader output location that
+ * the linker assigned to this variable. -1 if all components should be
+ * extracted.
+ */
+ int single_component;
/**
* The vertex shader output location that the linker assigned for this
@@ -1449,6 +1457,15 @@ private:
* if this variable is not a matrix.
*/
unsigned matrix_columns;
+
+ /** Type of the varying returned by glGetTransformFeedbackVarying() */
+ GLenum type;
+
+ /**
+ * If location != -1, the size that should be returned by
+ * glGetTransformFeedbackVarying().
+ */
+ unsigned size;
};
@@ -1458,8 +1475,8 @@ private:
* reported using linker_error(), and false is returned.
*/
bool
-tfeedback_decl::init(struct gl_shader_program *prog, const void *mem_ctx,
- const char *input)
+tfeedback_decl::init(struct gl_context *ctx, struct gl_shader_program *prog,
+ const void *mem_ctx, const char *input)
{
/* We don't have to be pedantic about what is a valid GLSL variable name,
* because any variable with an invalid name can't exist in the IR anyway.
@@ -1467,23 +1484,36 @@ tfeedback_decl::init(struct gl_shader_program *prog, const void *mem_ctx,
this->location = -1;
this->orig_name = input;
+ this->single_component = -1;
const char *bracket = strrchr(input, '[');
if (bracket) {
this->var_name = ralloc_strndup(mem_ctx, input, bracket - input);
- if (sscanf(bracket, "[%u]", &this->array_index) == 1) {
- this->is_array = true;
- return true;
+ if (sscanf(bracket, "[%u]", &this->array_subscript) != 1) {
+ linker_error(prog, "Cannot parse transform feedback varying %s", input);
+ return false;
}
+ this->is_subscripted = true;
} else {
this->var_name = ralloc_strdup(mem_ctx, input);
- this->is_array = false;
- return true;
+ this->is_subscripted = false;
}
- linker_error(prog, "Cannot parse transform feedback varying %s", input);
- return false;
+ /* For drivers that lower gl_ClipDistance to gl_ClipDistanceMESA, we need
+ * to convert a request for gl_ClipDistance[n] into a request for a
+ * component of gl_ClipDistanceMESA[n/4].
+ */
+ if (ctx->ShaderCompilerOptions[MESA_SHADER_VERTEX].LowerClipDistance &&
+ strcmp(this->var_name, "gl_ClipDistance") == 0) {
+ this->var_name = "gl_ClipDistanceMESA";
+ if (this->is_subscripted) {
+ this->single_component = this->array_subscript % 4;
+ this->array_subscript /= 4;
+ }
+ }
+
+ return true;
}
@@ -1496,9 +1526,11 @@ tfeedback_decl::is_same(const tfeedback_decl &x, const tfeedback_decl &y)
{
if (strcmp(x.var_name, y.var_name) != 0)
return false;
- if (x.is_array != y.is_array)
+ if (x.is_subscripted != y.is_subscripted)
+ return false;
+ if (x.is_subscripted && x.array_subscript != y.array_subscript)
return false;
- if (x.is_array && x.array_index != y.array_index)
+ if (x.single_component != y.single_component)
return false;
return true;
}
@@ -1518,37 +1550,42 @@ tfeedback_decl::assign_location(struct gl_context *ctx,
{
if (output_var->type->is_array()) {
/* Array variable */
- if (!this->is_array) {
- linker_error(prog, "Transform feedback varying %s found, "
- "but it's not an array ([] not expected).",
- this->orig_name);
- return false;
- }
- /* Check array bounds. */
- if (this->array_index >=
- (unsigned) output_var->type->array_size()) {
- linker_error(prog, "Transform feedback varying %s has index "
- "%i, but the array size is %i.",
- this->orig_name, this->array_index,
- output_var->type->array_size());
- return false;
- }
const unsigned matrix_cols =
output_var->type->fields.array->matrix_columns;
- this->location = output_var->location + this->array_index * matrix_cols;
+
+ if (this->is_subscripted) {
+ /* Check array bounds. */
+ if (this->array_subscript >=
+ (unsigned) output_var->type->array_size()) {
+ linker_error(prog, "Transform feedback varying %s has index "
+ "%i, but the array size is %i.",
+ this->orig_name, this->array_subscript,
+ output_var->type->array_size());
+ return false;
+ }
+ this->location =
+ output_var->location + this->array_subscript * matrix_cols;
+ this->size = 1;
+ } else {
+ this->location = output_var->location;
+ this->size = (unsigned) output_var->type->array_size();
+ }
this->vector_elements = output_var->type->fields.array->vector_elements;
this->matrix_columns = matrix_cols;
+ this->type = output_var->type->fields.array->gl_type;
} else {
/* Regular variable (scalar, vector, or matrix) */
- if (this->is_array) {
+ if (this->is_subscripted) {
linker_error(prog, "Transform feedback varying %s found, "
"but it's an array ([] expected).",
this->orig_name);
return false;
}
this->location = output_var->location;
+ this->size = 1;
this->vector_elements = output_var->type->vector_elements;
this->matrix_columns = output_var->type->matrix_columns;
+ this->type = output_var->type->gl_type;
}
/* From GL_EXT_transform_feedback:
* A program will fail to link if:
@@ -1580,7 +1617,7 @@ tfeedback_decl::assign_location(struct gl_context *ctx,
bool
tfeedback_decl::store(struct gl_shader_program *prog,
struct gl_transform_feedback_info *info,
- unsigned buffer) const
+ unsigned buffer, unsigned varying) const
{
if (!this->is_assigned()) {
/* From GL_EXT_transform_feedback:
@@ -1594,14 +1631,27 @@ tfeedback_decl::store(struct gl_shader_program *prog,
this->orig_name);
return false;
}
- for (unsigned v = 0; v < this->matrix_columns; ++v) {
- info->Outputs[info->NumOutputs].OutputRegister = this->location + v;
- info->Outputs[info->NumOutputs].NumComponents = this->vector_elements;
- info->Outputs[info->NumOutputs].OutputBuffer = buffer;
- info->Outputs[info->NumOutputs].DstOffset = info->BufferStride[buffer];
- ++info->NumOutputs;
- info->BufferStride[buffer] += this->vector_elements;
+ for (unsigned index = 0; index < this->size; ++index) {
+ for (unsigned v = 0; v < this->matrix_columns; ++v) {
+ unsigned num_components =
+ this->single_component >= 0 ? 1 : this->vector_elements;
+ info->Outputs[info->NumOutputs].OutputRegister =
+ this->location + v + index * this->matrix_columns;
+ info->Outputs[info->NumOutputs].NumComponents = num_components;
+ info->Outputs[info->NumOutputs].OutputBuffer = buffer;
+ info->Outputs[info->NumOutputs].DstOffset = info->BufferStride[buffer];
+ info->Outputs[info->NumOutputs].ComponentOffset =
+ this->single_component >= 0 ? this->single_component : 0;
+ ++info->NumOutputs;
+ info->BufferStride[buffer] += num_components;
+ }
}
+
+ info->Varyings[varying].Name = ralloc_strdup(prog, this->orig_name);
+ info->Varyings[varying].Type = this->type;
+ info->Varyings[varying].Size = this->size;
+ info->NumVarying++;
+
return true;
}
@@ -1614,12 +1664,12 @@ tfeedback_decl::store(struct gl_shader_program *prog,
* is returned.
*/
static bool
-parse_tfeedback_decls(struct gl_shader_program *prog, const void *mem_ctx,
- unsigned num_names, char **varying_names,
- tfeedback_decl *decls)
+parse_tfeedback_decls(struct gl_context *ctx, struct gl_shader_program *prog,
+ const void *mem_ctx, unsigned num_names,
+ char **varying_names, tfeedback_decl *decls)
{
for (unsigned i = 0; i < num_names; ++i) {
- if (!decls[i].init(prog, mem_ctx, varying_names[i]))
+ if (!decls[i].init(ctx, prog, mem_ctx, varying_names[i]))
return false;
/* From GL_EXT_transform_feedback:
* A program will fail to link if:
@@ -1865,13 +1915,26 @@ store_tfeedback_info(struct gl_context *ctx, struct gl_shader_program *prog,
tfeedback_decl *tfeedback_decls)
{
unsigned total_tfeedback_components = 0;
+ bool separate_attribs_mode =
+ prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS;
+
+ ralloc_free(prog->LinkedTransformFeedback.Varyings);
+
memset(&prog->LinkedTransformFeedback, 0,
sizeof(prog->LinkedTransformFeedback));
+
+ prog->LinkedTransformFeedback.NumBuffers =
+ separate_attribs_mode ? num_tfeedback_decls : 1;
+
+ prog->LinkedTransformFeedback.Varyings =
+ rzalloc_array(prog->LinkedTransformFeedback.Varyings,
+ struct gl_transform_feedback_varying_info,
+ num_tfeedback_decls);
+
for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
- unsigned buffer =
- prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS ? i : 0;
+ unsigned buffer = separate_attribs_mode ? i : 0;
if (!tfeedback_decls[i].store(prog, &prog->LinkedTransformFeedback,
- buffer))
+ buffer, i))
return false;
total_tfeedback_components += tfeedback_decls[i].num_components();
}
@@ -2182,7 +2245,7 @@ link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
tfeedback_decls = ralloc_array(mem_ctx, tfeedback_decl,
prog->TransformFeedback.NumVarying);
- if (!parse_tfeedback_decls(prog, mem_ctx, num_tfeedback_decls,
+ if (!parse_tfeedback_decls(ctx, prog, mem_ctx, num_tfeedback_decls,
prog->TransformFeedback.VaryingNames,
tfeedback_decls))
goto done;
diff --git a/mesalib/src/glsl/lower_output_reads.cpp b/mesalib/src/glsl/lower_output_reads.cpp
new file mode 100644
index 000000000..415b541c3
--- /dev/null
+++ b/mesalib/src/glsl/lower_output_reads.cpp
@@ -0,0 +1,141 @@
+/*
+ * Copyright © 2012 Vincent Lejeune
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "ir.h"
+#include "program/hash_table.h"
+
+/**
+ * \file lower_output_reads.cpp
+ *
+ * In GLSL, shader output variables (such as varyings) can be both read and
+ * written. However, on some hardware, reading an output register causes
+ * trouble.
+ *
+ * This pass creates temporary shadow copies of every (used) shader output,
+ * and replaces all accesses to use those instead. It also adds code to the
+ * main() function to copy the final values to the actual shader outputs.
+ */
+
+class output_read_remover : public ir_hierarchical_visitor {
+protected:
+ /**
+ * A hash table mapping from the original ir_variable shader outputs
+ * (ir_var_out mode) to the new temporaries to be used instead.
+ */
+ hash_table *replacements;
+
+ void *mem_ctx;
+public:
+ output_read_remover();
+ ~output_read_remover();
+ virtual ir_visitor_status visit(class ir_dereference_variable *);
+ virtual ir_visitor_status visit_leave(class ir_return *);
+ virtual ir_visitor_status visit_leave(class ir_function_signature *);
+};
+
+output_read_remover::output_read_remover()
+{
+ mem_ctx = ralloc_context(NULL);
+ replacements =
+ hash_table_ctor(0, hash_table_pointer_hash, hash_table_pointer_compare);
+}
+
+output_read_remover::~output_read_remover()
+{
+ hash_table_dtor(replacements);
+ ralloc_free(mem_ctx);
+}
+
+ir_visitor_status
+output_read_remover::visit(ir_dereference_variable *ir)
+{
+ if (ir->var->mode != ir_var_out)
+ return visit_continue;
+
+ ir_variable *temp = (ir_variable *) hash_table_find(replacements, ir->var);
+
+ /* If we don't have an existing temporary, create one. */
+ if (temp == NULL) {
+ void *var_ctx = ralloc_parent(ir->var);
+ temp = new(var_ctx) ir_variable(ir->var->type, ir->var->name,
+ ir_var_temporary);
+ hash_table_insert(replacements, temp, ir->var);
+ }
+
+ /* Update the dereference to use the temporary */
+ ir->var = temp;
+
+ return visit_continue;
+}
+
+/**
+ * Create an assignment to copy a temporary value back to the actual output.
+ */
+static ir_assignment *
+copy(void *ctx, ir_variable *output, ir_variable *temp)
+{
+ ir_dereference_variable *lhs = new(ctx) ir_dereference_variable(output);
+ ir_dereference_variable *rhs = new(ctx) ir_dereference_variable(temp);
+ return new(ctx) ir_assignment(lhs, rhs);
+}
+
+/** Insert a copy-back assignment before a "return" statement */
+static void
+emit_return_copy(const void *key, void *data, void *closure)
+{
+ ir_return *ir = (ir_return *) closure;
+ ir->insert_before(copy(ir, (ir_variable *) key, (ir_variable *) data));
+}
+
+/** Insert a copy-back assignment at the end of the main() function */
+static void
+emit_main_copy(const void *key, void *data, void *closure)
+{
+ ir_function_signature *sig = (ir_function_signature *) closure;
+ sig->body.push_tail(copy(sig, (ir_variable *) key, (ir_variable *) data));
+}
+
+ir_visitor_status
+output_read_remover::visit_leave(ir_return *ir)
+{
+ hash_table_call_foreach(replacements, emit_return_copy, ir);
+ return visit_continue;
+}
+
+ir_visitor_status
+output_read_remover::visit_leave(ir_function_signature *sig)
+{
+ if (strcmp(sig->function_name(), "main") != 0)
+ return visit_continue;
+
+ hash_table_call_foreach(replacements, emit_main_copy, sig);
+ return visit_continue;
+}
+
+void
+lower_output_reads(exec_list *instructions)
+{
+ output_read_remover v;
+ visit_list_elements(&v, instructions);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-14 06:09:25 +0000