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[Feat] (MG_Impl/GLImpl, MG_State): implement glBindFragDataLocationIndexed

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Bind a fragment output to both a color number and a color index (0 or 1
for dual-source blending), and report the bound index back through
glGetFragDataIndex.

- ProgramObject now tracks a per-output color index alongside the
  location: SetExplicitFragmentOutIndex stores it, it is snapshotted into
  the linked map at link time (like the location map), and
  GetFragmentDataIndex returns it (0 by default) for an active output.
- glBindFragDataLocation becomes glBindFragDataLocationIndexed with index
  0, matching the GL definition, so it also resets a previously-bound
  index to 0.
- Validation: index must be 0 or 1 (GL_INVALID_VALUE); colorNumber is
  bounded by GL_MAX_DRAW_BUFFERS for index 0 and GL_MAX_DUAL_SOURCE_DRAW_BUFFERS
  (reported as 1) for index 1 (GL_INVALID_VALUE); a gl_ name is
  GL_INVALID_OPERATION.
- glGetFragDataIndex now returns the real bound index instead of a
  hardcoded 0.

The index is tracked for reflection but is not yet plumbed into dual-source
blend rendering, and shader-side layout(index=) qualifiers are not
reflected -- both documented at the call sites.

Tests: index round-trip through a re-link (bind 1 -> GetFragDataIndex == 1;
glBindFragDataLocation resets to 0), plus the validation error table;
mutation-verified end to end. ProgramTest 24/24.
This commit is contained in:
swung0x48
2026-07-11 00:39:23 -04:00
parent bebe534bad
commit 22ac8a8c10
6 changed files with 79 additions and 10 deletions
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MobileGL/MG_Impl/GLImpl/Exporting/Definitions.cpp
+1 -1
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@@ -866,7 +866,7 @@ DECLARE_GL_FUNCTION_HEAD(void, MultiDrawElementsBaseVertex, GLenum mode, const G
DECLARE_GL_FUNCTION_HEAD(void, ProvokingVertex, GLenum mode) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ProvokingVertex, mode)
DECLARE_GL_FUNCTION_HEAD(void, TexImage2DMultisample, GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height, GLboolean fixedsamplelocations) DECLARE_GL_FUNCTION_END_NO_RETURN(void, TexImage2DMultisample, target, samples, internalformat, width, height, fixedsamplelocations)
DECLARE_GL_FUNCTION_HEAD(void, TexImage3DMultisample, GLenum target, GLsizei samples, GLenum internalformat, GLsizei width, GLsizei height, GLsizei depth, GLboolean fixedsamplelocations) DECLARE_GL_FUNCTION_END_NO_RETURN(void, TexImage3DMultisample, target, samples, internalformat, width, height, depth, fixedsamplelocations)
DECLARE_GL_FUNCTION_STUB_HEAD(void, BindFragDataLocationIndexed, GLuint program, GLuint colorNumber, GLuint index, const GLchar* name) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, BindFragDataLocationIndexed, program, colorNumber, index, name)
DECLARE_GL_FUNCTION_HEAD(void, BindFragDataLocationIndexed, GLuint program, GLuint colorNumber, GLuint index, const GLchar* name) DECLARE_GL_FUNCTION_END_NO_RETURN(void, BindFragDataLocationIndexed, program, colorNumber, index, name)
DECLARE_GL_FUNCTION_HEAD(GLint, GetFragDataIndex, GLuint program, const GLchar* name) DECLARE_GL_FUNCTION_END(GLint, GetFragDataIndex, program, name)
DECLARE_GL_FUNCTION_HEAD(void, QueryCounter, GLuint id, GLenum target) DECLARE_GL_FUNCTION_END_NO_RETURN(void, QueryCounter, id, target)
DECLARE_GL_FUNCTION_HEAD(void, GetQueryObjecti64v, GLuint id, GLenum pname, GLint64* params) DECLARE_GL_FUNCTION_END_NO_RETURN(void, GetQueryObjecti64v, id, pname, params)