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[Feat] (MG_Impl/GLImpl): implement glGetFragDataIndex

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Fill the stubbed GL 3.3 Core glGetFragDataIndex, mirroring its already-
implemented sibling glGetFragDataLocation: validate the program object and
link status, then return the fragment color index the name binds to.

Every active user-defined output uses color index 0. MobileGL does not yet
track dual-source (index 1) bindings -- glBindFragDataLocationIndexed and
the layout(index = 1) qualifier are unsupported -- so the result is exact
for any program that does not use dual-source blending; a name that is not
an active output (including gl_ built-ins) returns -1.

Tests: assertions on the existing linked-program test (valid output -> 0,
unknown name -> -1) plus a standalone invalid-handle case. The invalid-
handle test drains the error queue it produces so no stale error leaks
into a later test (the ProgramTest fixture does not reset it). ProgramTest
24/24.
This commit is contained in:
swung0x48
2026-07-11 00:03:08 -04:00
parent dc3c2cc5c7
commit 9ffcb23877
4 changed files with 50 additions and 1 deletions
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MobileGL/MG_Impl/GLImpl/Program/GL_Program.h
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@@ -126,6 +126,7 @@ namespace MobileGL::MG_Impl::GLImpl {
GLchar* uniformBlockName);
void BindFragDataLocation(GLuint program, GLuint colorNumber, const char* name);
GLint GetFragDataLocation(GLuint program, const char* name);
GLint GetFragDataIndex(GLuint program, const char* name);
void GetProgramInterfaceiv(GLuint program, GLenum programInterface, GLenum pname, GLint* params);
GLuint GetProgramResourceIndex(GLuint program, GLenum programInterface, const GLchar* name);
void GetProgramResourceName(GLuint program, GLenum programInterface, GLuint index, GLsizei bufSize,