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mesa: initial support for uniform variable initializers.

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This lets one specify initial values for uniforms in the code, avoiding
the need to call glUniform() in some cases.

(cherry picked from commit 379ff8c956)
This commit is contained in:
Brian Paul
2008-11-10 11:42:42 -07:00
committed by Brian Paul
parent c478a1baca
commit de44547891
1 changed files with 22 additions and 5 deletions
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src/mesa/shader/slang/slang_codegen.c
+22 -5
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@@ -3705,11 +3705,6 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
const GLint totalSize = array_size(size, var->array_len);
const GLuint swizzle = _slang_var_swizzle(totalSize, 0);
if (var->initializer) {
slang_info_log_error(A->log, "illegal initializer for uniform '%s'", varName);
return GL_FALSE;
}
if (prog) {
/* user-defined uniform */
if (datatype == GL_NONE) {
@@ -3734,6 +3729,12 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
* "f.a" (GL_FLOAT_VEC3)
* "f.b" (GL_FLOAT_VEC4)
*/
if (var->initializer) {
slang_info_log_error(A->log,
"unsupported initializer for uniform '%s'", varName);
return GL_FALSE;
}
}
else {
slang_info_log_error(A->log,
@@ -3747,6 +3748,22 @@ _slang_codegen_global_variable(slang_assemble_ctx *A, slang_variable *var,
totalSize, datatype);
store = _slang_new_ir_storage_swz(PROGRAM_UNIFORM, uniformLoc,
totalSize, swizzle);
if (var->initializer) {
_slang_simplify(var->initializer, &A->space, A->atoms);
if (var->initializer->type == SLANG_OPER_LITERAL_FLOAT ||
var->initializer->type == SLANG_OPER_LITERAL_INT) {
/* simple float/vector initializer */
GLfloat *uniformValue =
prog->Parameters->ParameterValues[uniformLoc];
COPY_4V(uniformValue, var->initializer->literal);
}
else {
/* complex initializer */
slang_info_log_error(A->log,
"unsupported initializer for uniform '%s'", varName);
return GL_FALSE;
}
}
}
}
else {