*
* \author Ian Romanick <ian.d.romanick@intel.com>
*/
-#include <cstdlib>
-#include <cstdio>
-#include <cstdarg>
-#include <climits>
-
-extern "C" {
-#include <talloc.h>
-}
#include "main/core.h"
#include "glsl_symbol_table.h"
#include "linker.h"
#include "ir_optimization.h"
+extern "C" {
+#include "main/shaderobj.h"
+}
+
/**
* Visitor that determines whether or not a variable is ever written.
*/
void
-linker_error_printf(gl_shader_program *prog, const char *fmt, ...)
+linker_error(gl_shader_program *prog, const char *fmt, ...)
{
va_list ap;
- prog->InfoLog = talloc_strdup_append(prog->InfoLog, "error: ");
+ ralloc_strcat(&prog->InfoLog, "error: ");
va_start(ap, fmt);
- prog->InfoLog = talloc_vasprintf_append(prog->InfoLog, fmt, ap);
+ ralloc_vasprintf_append(&prog->InfoLog, fmt, ap);
va_end(ap);
+
+ prog->LinkStatus = false;
}
void
-invalidate_variable_locations(gl_shader *sh, enum ir_variable_mode mode,
- int generic_base)
+linker_warning(gl_shader_program *prog, const char *fmt, ...)
+{
+ va_list ap;
+
+ ralloc_strcat(&prog->InfoLog, "error: ");
+ va_start(ap, fmt);
+ ralloc_vasprintf_append(&prog->InfoLog, fmt, ap);
+ va_end(ap);
+
+}
+
+
+void
+link_invalidate_variable_locations(gl_shader *sh, enum ir_variable_mode mode,
+ int generic_base)
{
foreach_list(node, sh->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
/* Only assign locations for generic attributes / varyings / etc.
*/
- if (var->location >= generic_base)
+ if ((var->location >= generic_base) && !var->explicit_location)
var->location = -1;
}
}
/**
- * Verify that a vertex shader executable meets all semantic requirements
+ * Verify that a vertex shader executable meets all semantic requirements.
+ *
+ * Also sets prog->Vert.UsesClipDistance as a side effect.
*
* \param shader Vertex shader executable to be verified
*/
find_assignment_visitor find("gl_Position");
find.run(shader->ir);
if (!find.variable_found()) {
- linker_error_printf(prog,
- "vertex shader does not write to `gl_Position'\n");
+ linker_error(prog, "vertex shader does not write to `gl_Position'\n");
return false;
}
+ if (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."
+ */
+ find_assignment_visitor clip_vertex("gl_ClipVertex");
+ find_assignment_visitor clip_distance("gl_ClipDistance");
+
+ clip_vertex.run(shader->ir);
+ clip_distance.run(shader->ir);
+ if (clip_vertex.variable_found() && clip_distance.variable_found()) {
+ linker_error(prog, "vertex shader writes to both `gl_ClipVertex' "
+ "and `gl_ClipDistance'\n");
+ return false;
+ }
+ prog->Vert.UsesClipDistance = clip_distance.variable_found();
+ }
+
return true;
}
frag_data.run(shader->ir);
if (frag_color.variable_found() && frag_data.variable_found()) {
- linker_error_printf(prog, "fragment shader writes to both "
- "`gl_FragColor' and `gl_FragData'\n");
+ linker_error(prog, "fragment shader writes to both "
+ "`gl_FragColor' and `gl_FragData'\n");
return false;
}
case ir_var_out: return "shader output";
case ir_var_inout: return "shader inout";
+ case ir_var_const_in:
case ir_var_temporary:
default:
assert(!"Should not get here.");
*/
glsl_symbol_table variables;
for (unsigned i = 0; i < num_shaders; i++) {
+ if (shader_list[i] == NULL)
+ continue;
+
foreach_list(node, shader_list[i]->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
&& (var->type->fields.array == existing->type->fields.array)
&& ((var->type->length == 0)
|| (existing->type->length == 0))) {
- if (existing->type->length == 0)
+ if (var->type->length != 0) {
existing->type = var->type;
+ }
} else {
- linker_error_printf(prog, "%s `%s' declared as type "
- "`%s' and type `%s'\n",
- mode_string(var),
- var->name, var->type->name,
- existing->type->name);
+ linker_error(prog, "%s `%s' declared as type "
+ "`%s' and type `%s'\n",
+ mode_string(var),
+ var->name, var->type->name,
+ existing->type->name);
return false;
}
}
- /* FINISHME: Handle non-constant initializers.
+ if (var->explicit_location) {
+ if (existing->explicit_location
+ && (var->location != existing->location)) {
+ linker_error(prog, "explicit locations for %s "
+ "`%s' have differing values\n",
+ mode_string(var), var->name);
+ return false;
+ }
+
+ existing->location = var->location;
+ existing->explicit_location = true;
+ }
+
+ /* Validate layout qualifiers for gl_FragDepth.
+ *
+ * From the AMD/ARB_conservative_depth specs:
+ *
+ * "If gl_FragDepth is redeclared in any fragment shader in a
+ * program, it must be redeclared in all fragment shaders in
+ * that program that have static assignments to
+ * gl_FragDepth. All redeclarations of gl_FragDepth in all
+ * fragment shaders in a single program must have the same set
+ * of qualifiers."
+ */
+ if (strcmp(var->name, "gl_FragDepth") == 0) {
+ bool layout_declared = var->depth_layout != ir_depth_layout_none;
+ bool layout_differs =
+ var->depth_layout != existing->depth_layout;
+
+ if (layout_declared && layout_differs) {
+ linker_error(prog,
+ "All redeclarations of gl_FragDepth in all "
+ "fragment shaders in a single program must have "
+ "the same set of qualifiers.");
+ }
+
+ if (var->used && layout_differs) {
+ linker_error(prog,
+ "If gl_FragDepth is redeclared with a layout "
+ "qualifier in any fragment shader, it must be "
+ "redeclared with the same layout qualifier in "
+ "all fragment shaders that have assignments to "
+ "gl_FragDepth");
+ }
+ }
+
+ /* Page 35 (page 41 of the PDF) of the GLSL 4.20 spec says:
+ *
+ * "If a shared global has multiple initializers, the
+ * initializers must all be constant expressions, and they
+ * must all have the same value. Otherwise, a link error will
+ * result. (A shared global having only one initializer does
+ * not require that initializer to be a constant expression.)"
+ *
+ * Previous to 4.20 the GLSL spec simply said that initializers
+ * must have the same value. In this case of non-constant
+ * initializers, this was impossible to determine. As a result,
+ * no vendor actually implemented that behavior. The 4.20
+ * behavior matches the implemented behavior of at least one other
+ * vendor, so we'll implement that for all GLSL versions.
*/
- if (var->constant_value != NULL) {
- if (existing->constant_value != NULL) {
- if (!var->constant_value->has_value(existing->constant_value)) {
- linker_error_printf(prog, "initializers for %s "
- "`%s' have differing values\n",
- mode_string(var), var->name);
+ if (var->constant_initializer != NULL) {
+ if (existing->constant_initializer != NULL) {
+ if (!var->constant_initializer->has_value(existing->constant_initializer)) {
+ linker_error(prog, "initializers for %s "
+ "`%s' have differing values\n",
+ mode_string(var), var->name);
return false;
}
- } else
+ } else {
/* If the first-seen instance of a particular uniform did not
* have an initializer but a later instance does, copy the
* initializer to the version stored in the symbol table.
* FINISHME: modify the shader, and linking with the second
* FINISHME: will fail.
*/
- existing->constant_value =
- var->constant_value->clone(talloc_parent(existing), NULL);
+ existing->constant_initializer =
+ var->constant_initializer->clone(ralloc_parent(existing),
+ NULL);
+ }
+ }
+
+ if (var->has_initializer) {
+ if (existing->has_initializer
+ && (var->constant_initializer == NULL
+ || existing->constant_initializer == NULL)) {
+ linker_error(prog,
+ "shared global variable `%s' has multiple "
+ "non-constant initializers.\n",
+ var->name);
+ return false;
+ }
+
+ /* Some instance had an initializer, so keep track of that. In
+ * this location, all sorts of initializers (constant or
+ * otherwise) will propagate the existence to the variable
+ * stored in the symbol table.
+ */
+ existing->has_initializer = true;
}
+
+ if (existing->invariant != var->invariant) {
+ linker_error(prog, "declarations for %s `%s' have "
+ "mismatching invariant qualifiers\n",
+ mode_string(var), var->name);
+ return false;
+ }
+ if (existing->centroid != var->centroid) {
+ linker_error(prog, "declarations for %s `%s' have "
+ "mismatching centroid qualifiers\n",
+ mode_string(var), var->name);
+ return false;
+ }
} else
- variables.add_variable(var->name, var);
+ variables.add_variable(var);
}
}
cross_validate_uniforms(struct gl_shader_program *prog)
{
return cross_validate_globals(prog, prog->_LinkedShaders,
- prog->_NumLinkedShaders, true);
+ MESA_SHADER_TYPES, true);
}
if ((var == NULL) || (var->mode != ir_var_out))
continue;
- parameters.add_variable(var->name, var);
+ parameters.add_variable(var);
}
/* Check that the types match between stages.
*/
if (input->type != output->type) {
- linker_error_printf(prog,
- "%s shader output `%s' declared as "
- "type `%s', but %s shader input declared "
- "as type `%s'\n",
- producer_stage, output->name,
- output->type->name,
- consumer_stage, input->type->name);
- return false;
+ /* There is a bit of a special case for gl_TexCoord. This
+ * built-in is unsized by default. Applications that variable
+ * access it must redeclare it with a size. There is some
+ * language in the GLSL spec that implies the fragment shader
+ * and vertex shader do not have to agree on this size. Other
+ * driver behave this way, and one or two applications seem to
+ * rely on it.
+ *
+ * Neither declaration needs to be modified here because the array
+ * sizes are fixed later when update_array_sizes is called.
+ *
+ * From page 48 (page 54 of the PDF) of the GLSL 1.10 spec:
+ *
+ * "Unlike user-defined varying variables, the built-in
+ * varying variables don't have a strict one-to-one
+ * correspondence between the vertex language and the
+ * fragment language."
+ */
+ if (!output->type->is_array()
+ || (strncmp("gl_", output->name, 3) != 0)) {
+ linker_error(prog,
+ "%s shader output `%s' declared as type `%s', "
+ "but %s shader input declared as type `%s'\n",
+ producer_stage, output->name,
+ output->type->name,
+ consumer_stage, input->type->name);
+ return false;
+ }
}
/* Check that all of the qualifiers match between stages.
*/
if (input->centroid != output->centroid) {
- linker_error_printf(prog,
- "%s shader output `%s' %s centroid qualifier, "
- "but %s shader input %s centroid qualifier\n",
- producer_stage,
- output->name,
- (output->centroid) ? "has" : "lacks",
- consumer_stage,
- (input->centroid) ? "has" : "lacks");
+ linker_error(prog,
+ "%s shader output `%s' %s centroid qualifier, "
+ "but %s shader input %s centroid qualifier\n",
+ producer_stage,
+ output->name,
+ (output->centroid) ? "has" : "lacks",
+ consumer_stage,
+ (input->centroid) ? "has" : "lacks");
return false;
}
if (input->invariant != output->invariant) {
- linker_error_printf(prog,
- "%s shader output `%s' %s invariant qualifier, "
- "but %s shader input %s invariant qualifier\n",
- producer_stage,
- output->name,
- (output->invariant) ? "has" : "lacks",
- consumer_stage,
- (input->invariant) ? "has" : "lacks");
+ linker_error(prog,
+ "%s shader output `%s' %s invariant qualifier, "
+ "but %s shader input %s invariant qualifier\n",
+ producer_stage,
+ output->name,
+ (output->invariant) ? "has" : "lacks",
+ consumer_stage,
+ (input->invariant) ? "has" : "lacks");
return false;
}
if (input->interpolation != output->interpolation) {
- linker_error_printf(prog,
- "%s shader output `%s' specifies %s "
- "interpolation qualifier, "
- "but %s shader input specifies %s "
- "interpolation qualifier\n",
- producer_stage,
- output->name,
- output->interpolation_string(),
- consumer_stage,
- input->interpolation_string());
+ linker_error(prog,
+ "%s shader output `%s' specifies %s "
+ "interpolation qualifier, "
+ "but %s shader input specifies %s "
+ "interpolation qualifier\n",
+ producer_stage,
+ output->name,
+ output->interpolation_string(),
+ consumer_stage,
+ input->interpolation_string());
return false;
}
}
ir_function *func;
if ((func = inst->as_function()) != NULL) {
- sh->symbols->add_function(func->name, func);
+ sh->symbols->add_function(func);
} else if ((var = inst->as_variable()) != NULL) {
- sh->symbols->add_variable(var->name, var);
+ sh->symbols->add_variable(var);
}
}
}
else {
ir_variable *copy = ir->var->clone(this->target, NULL);
- this->symbols->add_variable(copy->name, copy);
+ this->symbols->add_variable(copy);
this->instructions->push_head(copy);
ir->var = copy;
}
* shader is returned.
*/
static struct gl_shader *
-link_intrastage_shaders(GLcontext *ctx,
+link_intrastage_shaders(void *mem_ctx,
+ struct gl_context *ctx,
struct gl_shader_program *prog,
struct gl_shader **shader_list,
unsigned num_shaders)
if ((other_sig != NULL) && other_sig->is_defined
&& !other_sig->is_builtin) {
- linker_error_printf(prog,
- "function `%s' is multiply defined",
- f->name);
+ linker_error(prog, "function `%s' is multiply defined",
+ f->name);
return NULL;
}
}
}
if (main == NULL) {
- linker_error_printf(prog, "%s shader lacks `main'\n",
- (shader_list[0]->Type == GL_VERTEX_SHADER)
- ? "vertex" : "fragment");
+ linker_error(prog, "%s shader lacks `main'\n",
+ (shader_list[0]->Type == GL_VERTEX_SHADER)
+ ? "vertex" : "fragment");
return NULL;
}
- gl_shader *const linked = ctx->Driver.NewShader(NULL, 0, main->Type);
+ gl_shader *linked = ctx->Driver.NewShader(NULL, 0, main->Type);
linked->ir = new(linked) exec_list;
- clone_ir_list(linked, linked->ir, main->ir);
+ clone_ir_list(mem_ctx, linked->ir, main->ir);
populate_symbol_table(linked);
assert(idx == num_linking_shaders);
- link_function_calls(prog, linked, linking_shaders, num_linking_shaders);
+ if (!link_function_calls(prog, linked, linking_shaders,
+ num_linking_shaders)) {
+ ctx->Driver.DeleteShader(ctx, linked);
+ linked = NULL;
+ }
free(linking_shaders);
- return linked;
-}
+#ifdef DEBUG
+ /* At this point linked should contain all of the linked IR, so
+ * validate it to make sure nothing went wrong.
+ */
+ if (linked)
+ validate_ir_tree(linked->ir);
+#endif
+ /* Make a pass over all variable declarations to ensure that arrays with
+ * unspecified sizes have a size specified. The size is inferred from the
+ * max_array_access field.
+ */
+ if (linked != NULL) {
+ class array_sizing_visitor : public ir_hierarchical_visitor {
+ public:
+ virtual ir_visitor_status visit(ir_variable *var)
+ {
+ if (var->type->is_array() && (var->type->length == 0)) {
+ const glsl_type *type =
+ glsl_type::get_array_instance(var->type->fields.array,
+ var->max_array_access + 1);
+
+ assert(type != NULL);
+ var->type = type;
+ }
-struct uniform_node {
- exec_node link;
- struct gl_uniform *u;
- unsigned slots;
-};
+ return visit_continue;
+ }
+ } v;
+
+ v.run(linked->ir);
+ }
+
+ return linked;
+}
/**
* Update the sizes of linked shader uniform arrays to the maximum
static void
update_array_sizes(struct gl_shader_program *prog)
{
- for (unsigned i = 0; i < prog->_NumLinkedShaders; i++) {
+ for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
foreach_list(node, prog->_LinkedShaders[i]->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
continue;
unsigned int size = var->max_array_access;
- for (unsigned j = 0; j < prog->_NumLinkedShaders; j++) {
+ for (unsigned j = 0; j < MESA_SHADER_TYPES; j++) {
+ if (prog->_LinkedShaders[j] == NULL)
+ continue;
+
foreach_list(node2, prog->_LinkedShaders[j]->ir) {
ir_variable *other_var = ((ir_instruction *) node2)->as_variable();
if (!other_var)
}
if (size + 1 != var->type->fields.array->length) {
+ /* If this is a built-in uniform (i.e., it's backed by some
+ * fixed-function state), adjust the number of state slots to
+ * match the new array size. The number of slots per array entry
+ * is not known. It seems safe to assume that the total number of
+ * slots is an integer multiple of the number of array elements.
+ * Determine the number of slots per array element by dividing by
+ * the old (total) size.
+ */
+ if (var->num_state_slots > 0) {
+ var->num_state_slots = (size + 1)
+ * (var->num_state_slots / var->type->length);
+ }
+
var->type = glsl_type::get_array_instance(var->type->fields.array,
size + 1);
/* FINISHME: We should update the types of array
}
}
-static void
-add_uniform(void *mem_ctx, exec_list *uniforms, struct hash_table *ht,
- const char *name, const glsl_type *type, GLenum shader_type,
- unsigned *next_shader_pos, unsigned *total_uniforms)
-{
- if (type->is_record()) {
- for (unsigned int i = 0; i < type->length; i++) {
- const glsl_type *field_type = type->fields.structure[i].type;
- char *field_name = talloc_asprintf(mem_ctx, "%s.%s", name,
- type->fields.structure[i].name);
-
- add_uniform(mem_ctx, uniforms, ht, field_name, field_type,
- shader_type, next_shader_pos, total_uniforms);
- }
- } else {
- uniform_node *n = (uniform_node *) hash_table_find(ht, name);
- unsigned int vec4_slots;
- const glsl_type *array_elem_type = NULL;
-
- if (type->is_array()) {
- array_elem_type = type->fields.array;
- /* Array of structures. */
- if (array_elem_type->is_record()) {
- for (unsigned int i = 0; i < type->length; i++) {
- char *elem_name = talloc_asprintf(mem_ctx, "%s[%d]", name, i);
- add_uniform(mem_ctx, uniforms, ht, elem_name, array_elem_type,
- shader_type, next_shader_pos, total_uniforms);
- }
- return;
- }
- }
-
- /* Fix the storage size of samplers at 1 vec4 each. Be sure to pad out
- * vectors to vec4 slots.
- */
- if (type->is_array()) {
- if (array_elem_type->is_sampler())
- vec4_slots = type->length;
- else
- vec4_slots = type->length * array_elem_type->matrix_columns;
- } else if (type->is_sampler()) {
- vec4_slots = 1;
- } else {
- vec4_slots = type->matrix_columns;
- }
-
- if (n == NULL) {
- n = (uniform_node *) calloc(1, sizeof(struct uniform_node));
- n->u = (gl_uniform *) calloc(1, sizeof(struct gl_uniform));
- n->slots = vec4_slots;
-
- n->u->Name = strdup(name);
- n->u->Type = type;
- n->u->VertPos = -1;
- n->u->FragPos = -1;
- n->u->GeomPos = -1;
- (*total_uniforms)++;
-
- hash_table_insert(ht, n, name);
- uniforms->push_tail(& n->link);
- }
-
- switch (shader_type) {
- case GL_VERTEX_SHADER:
- n->u->VertPos = *next_shader_pos;
- break;
- case GL_FRAGMENT_SHADER:
- n->u->FragPos = *next_shader_pos;
- break;
- case GL_GEOMETRY_SHADER:
- n->u->GeomPos = *next_shader_pos;
- break;
- }
-
- (*next_shader_pos) += vec4_slots;
- }
-}
-
-void
-assign_uniform_locations(struct gl_shader_program *prog)
-{
- /* */
- exec_list uniforms;
- unsigned total_uniforms = 0;
- hash_table *ht = hash_table_ctor(32, hash_table_string_hash,
- hash_table_string_compare);
- void *mem_ctx = talloc_new(NULL);
-
- for (unsigned i = 0; i < prog->_NumLinkedShaders; i++) {
- unsigned next_position = 0;
-
- foreach_list(node, prog->_LinkedShaders[i]->ir) {
- ir_variable *const var = ((ir_instruction *) node)->as_variable();
-
- if ((var == NULL) || (var->mode != ir_var_uniform))
- continue;
-
- if (strncmp(var->name, "gl_", 3) == 0) {
- /* At the moment, we don't allocate uniform locations for
- * builtin uniforms. It's permitted by spec, and we'll
- * likely switch to doing that at some point, but not yet.
- */
- continue;
- }
-
- var->location = next_position;
- add_uniform(mem_ctx, &uniforms, ht, var->name, var->type,
- prog->_LinkedShaders[i]->Type,
- &next_position, &total_uniforms);
- }
- }
-
- talloc_free(mem_ctx);
-
- gl_uniform_list *ul = (gl_uniform_list *)
- calloc(1, sizeof(gl_uniform_list));
-
- ul->Size = total_uniforms;
- ul->NumUniforms = total_uniforms;
- ul->Uniforms = (gl_uniform *) calloc(total_uniforms, sizeof(gl_uniform));
-
- unsigned idx = 0;
- uniform_node *next;
- for (uniform_node *node = (uniform_node *) uniforms.head
- ; node->link.next != NULL
- ; node = next) {
- next = (uniform_node *) node->link.next;
-
- node->link.remove();
- memcpy(&ul->Uniforms[idx], node->u, sizeof(gl_uniform));
- idx++;
-
- free(node->u);
- free(node);
- }
-
- hash_table_dtor(ht);
-
- prog->Uniforms = ul;
-}
-
-
/**
- * Find a contiguous set of available bits in a bitmask
+ * Find a contiguous set of available bits in a bitmask.
*
* \param used_mask Bits representing used (1) and unused (0) locations
* \param needed_count Number of contiguous bits needed.
}
+/**
+ * Assign locations for either VS inputs for FS outputs
+ *
+ * \param prog Shader program whose variables need locations assigned
+ * \param target_index Selector for the program target to receive location
+ * assignmnets. Must be either \c MESA_SHADER_VERTEX or
+ * \c MESA_SHADER_FRAGMENT.
+ * \param max_index Maximum number of generic locations. This corresponds
+ * to either the maximum number of draw buffers or the
+ * maximum number of generic attributes.
+ *
+ * \return
+ * If locations are successfully assigned, true is returned. Otherwise an
+ * error is emitted to the shader link log and false is returned.
+ */
bool
-assign_attribute_locations(gl_shader_program *prog, unsigned max_attribute_index)
+assign_attribute_or_color_locations(gl_shader_program *prog,
+ unsigned target_index,
+ unsigned max_index)
{
- /* Mark invalid attribute locations as being used.
+ /* Mark invalid locations as being used.
*/
- unsigned used_locations = (max_attribute_index >= 32)
- ? ~0 : ~((1 << max_attribute_index) - 1);
+ unsigned used_locations = (max_index >= 32)
+ ? ~0 : ~((1 << max_index) - 1);
- gl_shader *const sh = prog->_LinkedShaders[0];
- assert(sh->Type == GL_VERTEX_SHADER);
+ assert((target_index == MESA_SHADER_VERTEX)
+ || (target_index == MESA_SHADER_FRAGMENT));
+
+ gl_shader *const sh = prog->_LinkedShaders[target_index];
+ if (sh == NULL)
+ return true;
/* Operate in a total of four passes.
*
* 1. Invalidate the location assignments for all vertex shader inputs.
*
* 2. Assign locations for inputs that have user-defined (via
- * glBindVertexAttribLocation) locatoins.
+ * glBindVertexAttribLocation) locations and outputs that have
+ * user-defined locations (via glBindFragDataLocation).
*
* 3. Sort the attributes without assigned locations by number of slots
* required in decreasing order. Fragmentation caused by attribute
* 4. Assign locations to any inputs without assigned locations.
*/
- invalidate_variable_locations(sh, ir_var_in, VERT_ATTRIB_GENERIC0);
+ const int generic_base = (target_index == MESA_SHADER_VERTEX)
+ ? (int) VERT_ATTRIB_GENERIC0 : (int) FRAG_RESULT_DATA0;
- if (prog->Attributes != NULL) {
- for (unsigned i = 0; i < prog->Attributes->NumParameters; i++) {
- ir_variable *const var =
- sh->symbols->get_variable(prog->Attributes->Parameters[i].Name);
+ const enum ir_variable_mode direction =
+ (target_index == MESA_SHADER_VERTEX) ? ir_var_in : ir_var_out;
- /* Note: attributes that occupy multiple slots, such as arrays or
- * matrices, may appear in the attrib array multiple times.
- */
- if ((var == NULL) || (var->location != -1))
- continue;
- /* From page 61 of the OpenGL 4.0 spec:
- *
- * "LinkProgram will fail if the attribute bindings assigned by
- * BindAttribLocation do not leave not enough space to assign a
- * location for an active matrix attribute or an active attribute
- * array, both of which require multiple contiguous generic
- * attributes."
- *
- * Previous versions of the spec contain similar language but omit the
- * bit about attribute arrays.
- *
- * Page 61 of the OpenGL 4.0 spec also says:
- *
- * "It is possible for an application to bind more than one
- * attribute name to the same location. This is referred to as
- * aliasing. This will only work if only one of the aliased
- * attributes is active in the executable program, or if no path
- * through the shader consumes more than one attribute of a set
- * of attributes aliased to the same location. A link error can
- * occur if the linker determines that every path through the
- * shader consumes multiple aliased attributes, but
- * implementations are not required to generate an error in this
- * case."
- *
- * These two paragraphs are either somewhat contradictory, or I don't
- * fully understand one or both of them.
- */
- /* FINISHME: The code as currently written does not support attribute
- * FINISHME: location aliasing (see comment above).
- */
- const int attr = prog->Attributes->Parameters[i].StateIndexes[0];
- const unsigned slots = count_attribute_slots(var->type);
-
- /* Mask representing the contiguous slots that will be used by this
- * attribute.
- */
- const unsigned use_mask = (1 << slots) - 1;
-
- /* Generate a link error if the set of bits requested for this
- * attribute overlaps any previously allocated bits.
- */
- if ((~(use_mask << attr) & used_locations) != used_locations) {
- linker_error_printf(prog,
- "insufficient contiguous attribute locations "
- "available for vertex shader input `%s'",
- var->name);
- return false;
- }
-
- var->location = VERT_ATTRIB_GENERIC0 + attr;
- used_locations |= (use_mask << attr);
- }
- }
+ link_invalidate_variable_locations(sh, direction, generic_base);
/* Temporary storage for the set of attributes that need locations assigned.
*/
foreach_list(node, sh->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
- if ((var == NULL) || (var->mode != ir_var_in))
+ if ((var == NULL) || (var->mode != (unsigned) direction))
continue;
- /* The location was explicitly assigned, nothing to do here.
+ if (var->explicit_location) {
+ if ((var->location >= (int)(max_index + generic_base))
+ || (var->location < 0)) {
+ linker_error(prog,
+ "invalid explicit location %d specified for `%s'\n",
+ (var->location < 0)
+ ? var->location : var->location - generic_base,
+ var->name);
+ return false;
+ }
+ } else if (target_index == MESA_SHADER_VERTEX) {
+ unsigned binding;
+
+ if (prog->AttributeBindings->get(binding, var->name)) {
+ assert(binding >= VERT_ATTRIB_GENERIC0);
+ var->location = binding;
+ }
+ } else if (target_index == MESA_SHADER_FRAGMENT) {
+ unsigned binding;
+
+ if (prog->FragDataBindings->get(binding, var->name)) {
+ assert(binding >= FRAG_RESULT_DATA0);
+ var->location = binding;
+ }
+ }
+
+ /* If the variable is not a built-in and has a location statically
+ * assigned in the shader (presumably via a layout qualifier), make sure
+ * that it doesn't collide with other assigned locations. Otherwise,
+ * add it to the list of variables that need linker-assigned locations.
*/
- if (var->location != -1)
+ const unsigned slots = count_attribute_slots(var->type);
+ if (var->location != -1) {
+ if (var->location >= generic_base) {
+ /* From page 61 of the OpenGL 4.0 spec:
+ *
+ * "LinkProgram will fail if the attribute bindings assigned
+ * by BindAttribLocation do not leave not enough space to
+ * assign a location for an active matrix attribute or an
+ * active attribute array, both of which require multiple
+ * contiguous generic attributes."
+ *
+ * Previous versions of the spec contain similar language but omit
+ * the bit about attribute arrays.
+ *
+ * Page 61 of the OpenGL 4.0 spec also says:
+ *
+ * "It is possible for an application to bind more than one
+ * attribute name to the same location. This is referred to as
+ * aliasing. This will only work if only one of the aliased
+ * attributes is active in the executable program, or if no
+ * path through the shader consumes more than one attribute of
+ * a set of attributes aliased to the same location. A link
+ * error can occur if the linker determines that every path
+ * through the shader consumes multiple aliased attributes,
+ * but implementations are not required to generate an error
+ * in this case."
+ *
+ * These two paragraphs are either somewhat contradictory, or I
+ * don't fully understand one or both of them.
+ */
+ /* FINISHME: The code as currently written does not support
+ * FINISHME: attribute location aliasing (see comment above).
+ */
+ /* Mask representing the contiguous slots that will be used by
+ * this attribute.
+ */
+ const unsigned attr = var->location - generic_base;
+ const unsigned use_mask = (1 << slots) - 1;
+
+ /* Generate a link error if the set of bits requested for this
+ * attribute overlaps any previously allocated bits.
+ */
+ if ((~(use_mask << attr) & used_locations) != used_locations) {
+ linker_error(prog,
+ "insufficient contiguous attribute locations "
+ "available for vertex shader input `%s'",
+ var->name);
+ return false;
+ }
+
+ used_locations |= (use_mask << attr);
+ }
+
continue;
+ }
- to_assign[num_attr].slots = count_attribute_slots(var->type);
+ to_assign[num_attr].slots = slots;
to_assign[num_attr].var = var;
num_attr++;
}
qsort(to_assign, num_attr, sizeof(to_assign[0]), temp_attr::compare);
- /* VERT_ATTRIB_GENERIC0 is a psdueo-alias for VERT_ATTRIB_POS. It can only
- * be explicitly assigned by via glBindAttribLocation. Mark it as reserved
- * to prevent it from being automatically allocated below.
- */
- find_deref_visitor find("gl_Vertex");
- find.run(sh->ir);
- if (find.variable_found())
- used_locations |= (1 << 0);
+ if (target_index == MESA_SHADER_VERTEX) {
+ /* VERT_ATTRIB_GENERIC0 is a pseudo-alias for VERT_ATTRIB_POS. It can
+ * only be explicitly assigned by via glBindAttribLocation. Mark it as
+ * reserved to prevent it from being automatically allocated below.
+ */
+ find_deref_visitor find("gl_Vertex");
+ find.run(sh->ir);
+ if (find.variable_found())
+ used_locations |= (1 << 0);
+ }
for (unsigned i = 0; i < num_attr; i++) {
/* Mask representing the contiguous slots that will be used by this
int location = find_available_slots(used_locations, to_assign[i].slots);
if (location < 0) {
- linker_error_printf(prog,
- "insufficient contiguous attribute locations "
- "available for vertex shader input `%s'",
- to_assign[i].var->name);
+ const char *const string = (target_index == MESA_SHADER_VERTEX)
+ ? "vertex shader input" : "fragment shader output";
+
+ linker_error(prog,
+ "insufficient contiguous attribute locations "
+ "available for %s `%s'",
+ string, to_assign[i].var->name);
return false;
}
- to_assign[i].var->location = VERT_ATTRIB_GENERIC0 + location;
+ to_assign[i].var->location = generic_base + location;
used_locations |= (use_mask << location);
}
/**
- * Demote shader outputs that are not read to being just plain global variables
+ * Demote shader inputs and outputs that are not used in other stages
*/
void
-demote_unread_shader_outputs(gl_shader *sh)
+demote_shader_inputs_and_outputs(gl_shader *sh, enum ir_variable_mode mode)
{
foreach_list(node, sh->ir) {
ir_variable *const var = ((ir_instruction *) node)->as_variable();
- if ((var == NULL) || (var->mode != ir_var_out))
+ if ((var == NULL) || (var->mode != int(mode)))
continue;
- /* An 'out' variable is only really a shader output if its value is read
- * by the following stage.
+ /* A shader 'in' or 'out' variable is only really an input or output if
+ * its value is used by other shader stages. This will cause the variable
+ * to have a location assigned.
*/
if (var->location == -1) {
var->mode = ir_var_auto;
}
+/**
+ * Data structure tracking information about a transform feedback declaration
+ * during linking.
+ */
+class tfeedback_decl
+{
+public:
+ bool init(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;
+
+
+ /**
+ * True if assign_location() has been called for this object.
+ */
+ bool is_assigned() const
+ {
+ return this->location != -1;
+ }
+
+ /**
+ * Determine whether this object refers to the variable var.
+ */
+ bool matches_var(ir_variable *var) const
+ {
+ return strcmp(var->name, this->var_name) == 0;
+ }
+
+ /**
+ * The total number of varying components taken up by this variable. Only
+ * valid if is_assigned() is true.
+ */
+ unsigned num_components() const
+ {
+ return this->vector_elements * this->matrix_columns;
+ }
+
+private:
+ /**
+ * The name that was supplied to glTransformFeedbackVaryings. Used for
+ * error reporting.
+ */
+ const char *orig_name;
+
+ /**
+ * The name of the variable, parsed from orig_name.
+ */
+ char *var_name;
+
+ /**
+ * True if the declaration in orig_name represents an array.
+ */
+ bool is_array;
+
+ /**
+ * If is_array is true, the array index that was specified in orig_name.
+ */
+ unsigned array_index;
+
+ /**
+ * The vertex shader output location that the linker assigned for this
+ * variable. -1 if a location hasn't been assigned yet.
+ */
+ int location;
+
+ /**
+ * If location != -1, the number of vector elements in this variable, or 1
+ * if this variable is a scalar.
+ */
+ unsigned vector_elements;
+
+ /**
+ * If location != -1, the number of matrix columns in this variable, or 1
+ * if this variable is not a matrix.
+ */
+ unsigned matrix_columns;
+};
+
+
+/**
+ * Initialize this object based on a string that was passed to
+ * glTransformFeedbackVaryings. If there is a parse error, the error is
+ * reported using linker_error(), and false is returned.
+ */
+bool
+tfeedback_decl::init(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.
+ */
+
+ this->location = -1;
+ this->orig_name = input;
+
+ 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;
+ }
+ } else {
+ this->var_name = ralloc_strdup(mem_ctx, input);
+ this->is_array = false;
+ return true;
+ }
+
+ linker_error(prog, "Cannot parse transform feedback varying %s", input);
+ return false;
+}
+
+
+/**
+ * Determine whether two tfeedback_decl objects refer to the same variable and
+ * array index (if applicable).
+ */
+bool
+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)
+ return false;
+ if (x.is_array && x.array_index != y.array_index)
+ return false;
+ return true;
+}
+
+
+/**
+ * Assign a location for this tfeedback_decl object based on the location
+ * assignment in output_var.
+ *
+ * If an error occurs, the error is reported through linker_error() and false
+ * is returned.
+ */
+bool
+tfeedback_decl::assign_location(struct gl_context *ctx,
+ struct gl_shader_program *prog,
+ ir_variable *output_var)
+{
+ 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;
+ this->vector_elements = output_var->type->fields.array->vector_elements;
+ this->matrix_columns = matrix_cols;
+ } else {
+ /* Regular variable (scalar, vector, or matrix) */
+ if (this->is_array) {
+ 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->vector_elements = output_var->type->vector_elements;
+ this->matrix_columns = output_var->type->matrix_columns;
+ }
+ /* From GL_EXT_transform_feedback:
+ * A program will fail to link if:
+ *
+ * * the total number of components to capture in any varying
+ * variable in <varyings> is greater than the constant
+ * MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS_EXT and the
+ * buffer mode is SEPARATE_ATTRIBS_EXT;
+ */
+ if (prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS &&
+ this->num_components() >
+ ctx->Const.MaxTransformFeedbackSeparateComponents) {
+ linker_error(prog, "Transform feedback varying %s exceeds "
+ "MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS.",
+ this->orig_name);
+ return false;
+ }
+
+ return true;
+}
+
+
+/**
+ * Update gl_transform_feedback_info to reflect this tfeedback_decl.
+ *
+ * If an error occurs, the error is reported through linker_error() and false
+ * is returned.
+ */
+bool
+tfeedback_decl::store(struct gl_shader_program *prog,
+ struct gl_transform_feedback_info *info,
+ unsigned buffer) const
+{
+ if (!this->is_assigned()) {
+ /* From GL_EXT_transform_feedback:
+ * A program will fail to link if:
+ *
+ * * any variable name specified in the <varyings> array is not
+ * declared as an output in the geometry shader (if present) or
+ * the vertex shader (if no geometry shader is present);
+ */
+ linker_error(prog, "Transform feedback varying %s undeclared.",
+ 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->NumOutputs;
+ }
+ return true;
+}
+
+
+/**
+ * Parse all the transform feedback declarations that were passed to
+ * glTransformFeedbackVaryings() and store them in tfeedback_decl objects.
+ *
+ * If an error occurs, the error is reported through linker_error() and false
+ * 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)
+{
+ for (unsigned i = 0; i < num_names; ++i) {
+ if (!decls[i].init(prog, mem_ctx, varying_names[i]))
+ return false;
+ /* From GL_EXT_transform_feedback:
+ * A program will fail to link if:
+ *
+ * * any two entries in the <varyings> array specify the same varying
+ * variable;
+ *
+ * We interpret this to mean "any two entries in the <varyings> array
+ * specify the same varying variable and array index", since transform
+ * feedback of arrays would be useless otherwise.
+ */
+ for (unsigned j = 0; j < i; ++j) {
+ if (tfeedback_decl::is_same(decls[i], decls[j])) {
+ linker_error(prog, "Transform feedback varying %s specified "
+ "more than once.", varying_names[i]);
+ return false;
+ }
+ }
+ }
+ return true;
+}
+
+
+/**
+ * Assign a location for a variable that is produced in one pipeline stage
+ * (the "producer") and consumed in the next stage (the "consumer").
+ *
+ * \param input_var is the input variable declaration in the consumer.
+ *
+ * \param output_var is the output variable declaration in the producer.
+ *
+ * \param input_index is the counter that keeps track of assigned input
+ * locations in the consumer.
+ *
+ * \param output_index is the counter that keeps track of assigned output
+ * locations in the producer.
+ *
+ * It is permissible for \c input_var to be NULL (this happens if a variable
+ * is output by the producer and consumed by transform feedback, but not
+ * consumed by the consumer).
+ *
+ * If the variable has already been assigned a location, this function has no
+ * effect.
+ */
void
-assign_varying_locations(struct gl_shader_program *prog,
- gl_shader *producer, gl_shader *consumer)
+assign_varying_location(ir_variable *input_var, ir_variable *output_var,
+ unsigned *input_index, unsigned *output_index)
+{
+ if (output_var->location != -1) {
+ /* Location already assigned. */
+ return;
+ }
+
+ if (input_var) {
+ assert(input_var->location == -1);
+ input_var->location = *input_index;
+ }
+
+ output_var->location = *output_index;
+
+ /* FINISHME: Support for "varying" records in GLSL 1.50. */
+ assert(!output_var->type->is_record());
+
+ if (output_var->type->is_array()) {
+ const unsigned slots = output_var->type->length
+ * output_var->type->fields.array->matrix_columns;
+
+ *output_index += slots;
+ *input_index += slots;
+ } else {
+ const unsigned slots = output_var->type->matrix_columns;
+
+ *output_index += slots;
+ *input_index += slots;
+ }
+}
+
+
+/**
+ * Assign locations for all variables that are produced in one pipeline stage
+ * (the "producer") and consumed in the next stage (the "consumer").
+ *
+ * Variables produced by the producer may also be consumed by transform
+ * feedback.
+ *
+ * \param num_tfeedback_decls is the number of declarations indicating
+ * variables that may be consumed by transform feedback.
+ *
+ * \param tfeedback_decls is a pointer to an array of tfeedback_decl objects
+ * representing the result of parsing the strings passed to
+ * glTransformFeedbackVaryings(). assign_location() will be called for
+ * each of these objects that matches one of the outputs of the
+ * producer.
+ *
+ * When num_tfeedback_decls is nonzero, it is permissible for the consumer to
+ * be NULL. In this case, varying locations are assigned solely based on the
+ * requirements of transform feedback.
+ */
+bool
+assign_varying_locations(struct gl_context *ctx,
+ struct gl_shader_program *prog,
+ gl_shader *producer, gl_shader *consumer,
+ unsigned num_tfeedback_decls,
+ tfeedback_decl *tfeedback_decls)
{
/* FINISHME: Set dynamically when geometry shader support is added. */
unsigned output_index = VERT_RESULT_VAR0;
* not being inputs. This lets the optimizer eliminate them.
*/
- invalidate_variable_locations(producer, ir_var_out, VERT_RESULT_VAR0);
- invalidate_variable_locations(consumer, ir_var_in, FRAG_ATTRIB_VAR0);
+ link_invalidate_variable_locations(producer, ir_var_out, VERT_RESULT_VAR0);
+ if (consumer)
+ link_invalidate_variable_locations(consumer, ir_var_in, FRAG_ATTRIB_VAR0);
foreach_list(node, producer->ir) {
ir_variable *const output_var = ((ir_instruction *) node)->as_variable();
- if ((output_var == NULL) || (output_var->mode != ir_var_out)
- || (output_var->location != -1))
+ if ((output_var == NULL) || (output_var->mode != ir_var_out))
continue;
- ir_variable *const input_var =
- consumer->symbols->get_variable(output_var->name);
+ ir_variable *input_var =
+ consumer ? consumer->symbols->get_variable(output_var->name) : NULL;
- if ((input_var == NULL) || (input_var->mode != ir_var_in))
- continue;
+ if (input_var && input_var->mode != ir_var_in)
+ input_var = NULL;
- assert(input_var->location == -1);
+ if (input_var) {
+ assign_varying_location(input_var, output_var, &input_index,
+ &output_index);
+ }
- output_var->location = output_index;
- input_var->location = input_index;
+ for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
+ if (!tfeedback_decls[i].is_assigned() &&
+ tfeedback_decls[i].matches_var(output_var)) {
+ if (output_var->location == -1) {
+ assign_varying_location(input_var, output_var, &input_index,
+ &output_index);
+ }
+ if (!tfeedback_decls[i].assign_location(ctx, prog, output_var))
+ return false;
+ }
+ }
+ }
+
+ unsigned varying_vectors = 0;
+
+ if (consumer) {
+ foreach_list(node, consumer->ir) {
+ ir_variable *const var = ((ir_instruction *) node)->as_variable();
+
+ if ((var == NULL) || (var->mode != ir_var_in))
+ continue;
+
+ if (var->location == -1) {
+ if (prog->Version <= 120) {
+ /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
+ *
+ * Only those varying variables used (i.e. read) in
+ * the fragment shader executable must be written to
+ * by the vertex shader executable; declaring
+ * superfluous varying variables in a vertex shader is
+ * permissible.
+ *
+ * We interpret this text as meaning that the VS must
+ * write the variable for the FS to read it. See
+ * "glsl1-varying read but not written" in piglit.
+ */
+
+ linker_error(prog, "fragment shader varying %s not written "
+ "by vertex shader\n.", var->name);
+ }
+
+ /* An 'in' variable is only really a shader input if its
+ * value is written by the previous stage.
+ */
+ var->mode = ir_var_auto;
+ } else {
+ /* The packing rules are used for vertex shader inputs are also
+ * used for fragment shader inputs.
+ */
+ varying_vectors += count_attribute_slots(var->type);
+ }
+ }
+ }
- /* FINISHME: Support for "varying" records in GLSL 1.50. */
- assert(!output_var->type->is_record());
+ if (ctx->API == API_OPENGLES2 || prog->Version == 100) {
+ if (varying_vectors > ctx->Const.MaxVarying) {
+ linker_error(prog, "shader uses too many varying vectors "
+ "(%u > %u)\n",
+ varying_vectors, ctx->Const.MaxVarying);
+ return false;
+ }
+ } else {
+ const unsigned float_components = varying_vectors * 4;
+ if (float_components > ctx->Const.MaxVarying * 4) {
+ linker_error(prog, "shader uses too many varying components "
+ "(%u > %u)\n",
+ float_components, ctx->Const.MaxVarying * 4);
+ return false;
+ }
+ }
- if (output_var->type->is_array()) {
- const unsigned slots = output_var->type->length
- * output_var->type->fields.array->matrix_columns;
+ return true;
+}
- output_index += slots;
- input_index += slots;
- } else {
- const unsigned slots = output_var->type->matrix_columns;
- output_index += slots;
- input_index += slots;
- }
+/**
+ * Store transform feedback location assignments into
+ * prog->LinkedTransformFeedback based on the data stored in tfeedback_decls.
+ *
+ * If an error occurs, the error is reported through linker_error() and false
+ * is returned.
+ */
+static bool
+store_tfeedback_info(struct gl_context *ctx, struct gl_shader_program *prog,
+ unsigned num_tfeedback_decls,
+ tfeedback_decl *tfeedback_decls)
+{
+ unsigned total_tfeedback_components = 0;
+ prog->LinkedTransformFeedback.NumOutputs = 0;
+ for (unsigned i = 0; i < num_tfeedback_decls; ++i) {
+ unsigned buffer =
+ prog->TransformFeedback.BufferMode == GL_SEPARATE_ATTRIBS ? i : 0;
+ if (!tfeedback_decls[i].store(prog, &prog->LinkedTransformFeedback,
+ buffer))
+ return false;
+ total_tfeedback_components += tfeedback_decls[i].num_components();
}
- demote_unread_shader_outputs(producer);
+ /* From GL_EXT_transform_feedback:
+ * A program will fail to link if:
+ *
+ * * the total number of components to capture is greater than
+ * the constant MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS_EXT
+ * and the buffer mode is INTERLEAVED_ATTRIBS_EXT.
+ */
+ if (prog->TransformFeedback.BufferMode == GL_INTERLEAVED_ATTRIBS &&
+ total_tfeedback_components >
+ ctx->Const.MaxTransformFeedbackInterleavedComponents) {
+ linker_error(prog, "The MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS "
+ "limit has been exceeded.");
+ return false;
+ }
- foreach_list(node, consumer->ir) {
- ir_variable *const var = ((ir_instruction *) node)->as_variable();
+ return true;
+}
- if ((var == NULL) || (var->mode != ir_var_in))
- continue;
+/**
+ * Store the gl_FragDepth layout in the gl_shader_program struct.
+ */
+static void
+store_fragdepth_layout(struct gl_shader_program *prog)
+{
+ if (prog->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL) {
+ return;
+ }
- if (var->location == -1) {
- if (prog->Version <= 120) {
- /* On page 25 (page 31 of the PDF) of the GLSL 1.20 spec:
- *
- * Only those varying variables used (i.e. read) in
- * the fragment shader executable must be written to
- * by the vertex shader executable; declaring
- * superfluous varying variables in a vertex shader is
- * permissible.
- *
- * We interpret this text as meaning that the VS must
- * write the variable for the FS to read it. See
- * "glsl1-varying read but not written" in piglit.
- */
+ struct exec_list *ir = prog->_LinkedShaders[MESA_SHADER_FRAGMENT]->ir;
- linker_error_printf(prog, "fragment shader varying %s not written "
- "by vertex shader\n.", var->name);
- prog->LinkStatus = false;
- }
+ /* We don't look up the gl_FragDepth symbol directly because if
+ * gl_FragDepth is not used in the shader, it's removed from the IR.
+ * However, the symbol won't be removed from the symbol table.
+ *
+ * We're only interested in the cases where the variable is NOT removed
+ * from the IR.
+ */
+ foreach_list(node, ir) {
+ ir_variable *const var = ((ir_instruction *) node)->as_variable();
- /* An 'in' variable is only really a shader input if its
- * value is written by the previous stage.
- */
- var->mode = ir_var_auto;
+ if (var == NULL || var->mode != ir_var_out) {
+ continue;
+ }
+
+ if (strcmp(var->name, "gl_FragDepth") == 0) {
+ switch (var->depth_layout) {
+ case ir_depth_layout_none:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_NONE;
+ return;
+ case ir_depth_layout_any:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_ANY;
+ return;
+ case ir_depth_layout_greater:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_GREATER;
+ return;
+ case ir_depth_layout_less:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_LESS;
+ return;
+ case ir_depth_layout_unchanged:
+ prog->FragDepthLayout = FRAG_DEPTH_LAYOUT_UNCHANGED;
+ return;
+ default:
+ assert(0);
+ return;
+ }
}
}
}
+/**
+ * Validate the resources used by a program versus the implementation limits
+ */
+static bool
+check_resources(struct gl_context *ctx, struct gl_shader_program *prog)
+{
+ static const char *const shader_names[MESA_SHADER_TYPES] = {
+ "vertex", "fragment", "geometry"
+ };
+
+ const unsigned max_samplers[MESA_SHADER_TYPES] = {
+ ctx->Const.MaxVertexTextureImageUnits,
+ ctx->Const.MaxTextureImageUnits,
+ ctx->Const.MaxGeometryTextureImageUnits
+ };
+
+ const unsigned max_uniform_components[MESA_SHADER_TYPES] = {
+ ctx->Const.VertexProgram.MaxUniformComponents,
+ ctx->Const.FragmentProgram.MaxUniformComponents,
+ 0 /* FINISHME: Geometry shaders. */
+ };
+
+ for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
+ struct gl_shader *sh = prog->_LinkedShaders[i];
+
+ if (sh == NULL)
+ continue;
+
+ if (sh->num_samplers > max_samplers[i]) {
+ linker_error(prog, "Too many %s shader texture samplers",
+ shader_names[i]);
+ }
+
+ if (sh->num_uniform_components > max_uniform_components[i]) {
+ linker_error(prog, "Too many %s shader uniform components",
+ shader_names[i]);
+ }
+ }
+
+ return prog->LinkStatus;
+}
void
-link_shaders(GLcontext *ctx, struct gl_shader_program *prog)
+link_shaders(struct gl_context *ctx, struct gl_shader_program *prog)
{
+ tfeedback_decl *tfeedback_decls = NULL;
+ unsigned num_tfeedback_decls = prog->TransformFeedback.NumVarying;
+
+ void *mem_ctx = ralloc_context(NULL); // temporary linker context
+
prog->LinkStatus = false;
prog->Validated = false;
prog->_Used = false;
if (prog->InfoLog != NULL)
- talloc_free(prog->InfoLog);
+ ralloc_free(prog->InfoLog);
- prog->InfoLog = talloc_strdup(NULL, "");
+ prog->InfoLog = ralloc_strdup(NULL, "");
/* Separate the shaders into groups based on their type.
*/
assert(max_version <= 130);
if ((max_version >= 130 || min_version == 100)
&& min_version != max_version) {
- linker_error_printf(prog, "all shaders must use same shading "
- "language version\n");
+ linker_error(prog, "all shaders must use same shading "
+ "language version\n");
goto done;
}
prog->Version = max_version;
- for (unsigned int i = 0; i < prog->_NumLinkedShaders; i++) {
- ctx->Driver.DeleteShader(ctx, prog->_LinkedShaders[i]);
+ for (unsigned int i = 0; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] != NULL)
+ ctx->Driver.DeleteShader(ctx, prog->_LinkedShaders[i]);
+
+ prog->_LinkedShaders[i] = NULL;
}
/* Link all shaders for a particular stage and validate the result.
*/
- prog->_NumLinkedShaders = 0;
if (num_vert_shaders > 0) {
gl_shader *const sh =
- link_intrastage_shaders(ctx, prog, vert_shader_list, num_vert_shaders);
+ link_intrastage_shaders(mem_ctx, ctx, prog, vert_shader_list,
+ num_vert_shaders);
if (sh == NULL)
goto done;
if (!validate_vertex_shader_executable(prog, sh))
- goto done;
+ goto done;
- prog->_LinkedShaders[prog->_NumLinkedShaders] = sh;
- prog->_NumLinkedShaders++;
+ _mesa_reference_shader(ctx, &prog->_LinkedShaders[MESA_SHADER_VERTEX],
+ sh);
}
if (num_frag_shaders > 0) {
gl_shader *const sh =
- link_intrastage_shaders(ctx, prog, frag_shader_list, num_frag_shaders);
+ link_intrastage_shaders(mem_ctx, ctx, prog, frag_shader_list,
+ num_frag_shaders);
if (sh == NULL)
goto done;
if (!validate_fragment_shader_executable(prog, sh))
- goto done;
+ goto done;
- prog->_LinkedShaders[prog->_NumLinkedShaders] = sh;
- prog->_NumLinkedShaders++;
+ _mesa_reference_shader(ctx, &prog->_LinkedShaders[MESA_SHADER_FRAGMENT],
+ sh);
}
/* Here begins the inter-stage linking phase. Some initial validation is
* varyings.
*/
if (cross_validate_uniforms(prog)) {
- /* Validate the inputs of each stage with the output of the preceeding
+ unsigned prev;
+
+ for (prev = 0; prev < MESA_SHADER_TYPES; prev++) {
+ if (prog->_LinkedShaders[prev] != NULL)
+ break;
+ }
+
+ /* Validate the inputs of each stage with the output of the preceding
* stage.
*/
- for (unsigned i = 1; i < prog->_NumLinkedShaders; i++) {
+ for (unsigned i = prev + 1; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
if (!cross_validate_outputs_to_inputs(prog,
- prog->_LinkedShaders[i - 1],
+ prog->_LinkedShaders[prev],
prog->_LinkedShaders[i]))
goto done;
+
+ prev = i;
}
prog->LinkStatus = true;
* uniforms, and varyings. Later optimization could possibly make
* some of that unused.
*/
- for (unsigned i = 0; i < prog->_NumLinkedShaders; i++) {
- while (do_common_optimization(prog->_LinkedShaders[i]->ir, true, 32))
+ for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
+ detect_recursion_linked(prog, prog->_LinkedShaders[i]->ir);
+ if (!prog->LinkStatus)
+ goto done;
+
+ if (ctx->ShaderCompilerOptions[i].LowerClipDistance)
+ lower_clip_distance(prog->_LinkedShaders[i]->ir);
+
+ while (do_common_optimization(prog->_LinkedShaders[i]->ir, true, false, 32))
;
}
- update_array_sizes(prog);
+ /* FINISHME: The value of the max_attribute_index parameter is
+ * FINISHME: implementation dependent based on the value of
+ * FINISHME: GL_MAX_VERTEX_ATTRIBS. GL_MAX_VERTEX_ATTRIBS must be
+ * FINISHME: at least 16, so hardcode 16 for now.
+ */
+ if (!assign_attribute_or_color_locations(prog, MESA_SHADER_VERTEX, 16)) {
+ goto done;
+ }
- assign_uniform_locations(prog);
+ if (!assign_attribute_or_color_locations(prog, MESA_SHADER_FRAGMENT, ctx->Const.MaxDrawBuffers)) {
+ goto done;
+ }
- if (prog->_NumLinkedShaders && prog->_LinkedShaders[0]->Type == GL_VERTEX_SHADER) {
- /* FINISHME: The value of the max_attribute_index parameter is
- * FINISHME: implementation dependent based on the value of
- * FINISHME: GL_MAX_VERTEX_ATTRIBS. GL_MAX_VERTEX_ATTRIBS must be
- * FINISHME: at least 16, so hardcode 16 for now.
+ unsigned prev;
+ for (prev = 0; prev < MESA_SHADER_TYPES; prev++) {
+ if (prog->_LinkedShaders[prev] != NULL)
+ break;
+ }
+
+ if (num_tfeedback_decls != 0) {
+ /* From GL_EXT_transform_feedback:
+ * A program will fail to link if:
+ *
+ * * the <count> specified by TransformFeedbackVaryingsEXT is
+ * non-zero, but the program object has no vertex or geometry
+ * shader;
*/
- if (!assign_attribute_locations(prog, 16)) {
- prog->LinkStatus = false;
- goto done;
+ if (prev >= MESA_SHADER_FRAGMENT) {
+ linker_error(prog, "Transform feedback varyings specified, but "
+ "no vertex or geometry shader is present.");
+ goto done;
}
- if (prog->_NumLinkedShaders == 1)
- demote_unread_shader_outputs(prog->_LinkedShaders[0]);
+ tfeedback_decls = ralloc_array(mem_ctx, tfeedback_decl,
+ prog->TransformFeedback.NumVarying);
+ if (!parse_tfeedback_decls(prog, mem_ctx, num_tfeedback_decls,
+ prog->TransformFeedback.VaryingNames,
+ tfeedback_decls))
+ goto done;
}
- for (unsigned i = 1; i < prog->_NumLinkedShaders; i++)
- assign_varying_locations(prog,
- prog->_LinkedShaders[i - 1],
- prog->_LinkedShaders[i]);
+ for (unsigned i = prev + 1; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
+ if (!assign_varying_locations(
+ ctx, prog, prog->_LinkedShaders[prev], prog->_LinkedShaders[i],
+ i == MESA_SHADER_FRAGMENT ? num_tfeedback_decls : 0,
+ tfeedback_decls))
+ goto done;
+
+ prev = i;
+ }
+
+ if (prev != MESA_SHADER_FRAGMENT && num_tfeedback_decls != 0) {
+ /* There was no fragment shader, but we still have to assign varying
+ * locations for use by transform feedback.
+ */
+ if (!assign_varying_locations(
+ ctx, prog, prog->_LinkedShaders[prev], NULL, num_tfeedback_decls,
+ tfeedback_decls))
+ goto done;
+ }
+
+ if (!store_tfeedback_info(ctx, prog, num_tfeedback_decls, tfeedback_decls))
+ goto done;
+
+ if (prog->_LinkedShaders[MESA_SHADER_VERTEX] != NULL) {
+ demote_shader_inputs_and_outputs(prog->_LinkedShaders[MESA_SHADER_VERTEX],
+ ir_var_out);
+
+ /* Eliminate code that is now dead due to unused vertex outputs being
+ * demoted.
+ */
+ while (do_dead_code(prog->_LinkedShaders[MESA_SHADER_VERTEX]->ir, false))
+ ;
+ }
+
+ if (prog->_LinkedShaders[MESA_SHADER_GEOMETRY] != NULL) {
+ gl_shader *const sh = prog->_LinkedShaders[MESA_SHADER_GEOMETRY];
+
+ demote_shader_inputs_and_outputs(sh, ir_var_in);
+ demote_shader_inputs_and_outputs(sh, ir_var_inout);
+ demote_shader_inputs_and_outputs(sh, ir_var_out);
+
+ /* Eliminate code that is now dead due to unused geometry outputs being
+ * demoted.
+ */
+ while (do_dead_code(prog->_LinkedShaders[MESA_SHADER_GEOMETRY]->ir, false))
+ ;
+ }
+
+ if (prog->_LinkedShaders[MESA_SHADER_FRAGMENT] != NULL) {
+ gl_shader *const sh = prog->_LinkedShaders[MESA_SHADER_FRAGMENT];
+
+ demote_shader_inputs_and_outputs(sh, ir_var_in);
+
+ /* Eliminate code that is now dead due to unused fragment inputs being
+ * demoted. This shouldn't actually do anything other than remove
+ * declarations of the (now unused) global variables.
+ */
+ while (do_dead_code(prog->_LinkedShaders[MESA_SHADER_FRAGMENT]->ir, false))
+ ;
+ }
+
+ update_array_sizes(prog);
+ link_assign_uniform_locations(prog);
+ store_fragdepth_layout(prog);
+
+ if (!check_resources(ctx, prog))
+ goto done;
+
+ /* OpenGL ES requires that a vertex shader and a fragment shader both be
+ * present in a linked program. By checking for use of shading language
+ * version 1.00, we also catch the GL_ARB_ES2_compatibility case.
+ */
+ if (!prog->InternalSeparateShader &&
+ (ctx->API == API_OPENGLES2 || prog->Version == 100)) {
+ if (prog->_LinkedShaders[MESA_SHADER_VERTEX] == NULL) {
+ linker_error(prog, "program lacks a vertex shader\n");
+ } else if (prog->_LinkedShaders[MESA_SHADER_FRAGMENT] == NULL) {
+ linker_error(prog, "program lacks a fragment shader\n");
+ }
+ }
/* FINISHME: Assign fragment shader output locations. */
done:
free(vert_shader_list);
+
+ for (unsigned i = 0; i < MESA_SHADER_TYPES; i++) {
+ if (prog->_LinkedShaders[i] == NULL)
+ continue;
+
+ /* Retain any live IR, but trash the rest. */
+ reparent_ir(prog->_LinkedShaders[i]->ir, prog->_LinkedShaders[i]->ir);
+
+ /* The symbol table in the linked shaders may contain references to
+ * variables that were removed (e.g., unused uniforms). Since it may
+ * contain junk, there is no possible valid use. Delete it and set the
+ * pointer to NULL.
+ */
+ delete prog->_LinkedShaders[i]->symbols;
+ prog->_LinkedShaders[i]->symbols = NULL;
+ }
+
+ ralloc_free(mem_ctx);
}
projects / mesa.git / blobdiff