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[Feat] (MG_Impl/GLImpl, MG_State): implement glClampColor and glPolygonMode

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Fill the two empty // TODO state handlers with GL 3.3 Core-conformant
behavior, backed by new RenderState fields and glGet* read-back.

glClampColor:
- Accept only GL_CLAMP_READ_COLOR (compat GL_CLAMP_VERTEX/FRAGMENT_COLOR
  rejected); clamp is one of GL_TRUE / GL_FALSE / GL_FIXED_ONLY. Note the
  Khronos man page wrongly omits GL_FIXED_ONLY from the accepted set, but
  it is legal AND the default, so it is accepted here.
- Default GL_FIXED_ONLY; both error paths are GL_INVALID_ENUM with no
  state change. glGetIntegerv returns the raw tri-state enum; GetFloatv/
  GetDoublev widen it and GetBooleanv converts nonzero to GL_TRUE via the
  existing fall-through, so one GetIntegerv case serves every getter.

glPolygonMode:
- Core accepts only face == GL_FRONT_AND_BACK (GL_FRONT/GL_BACK were
  removed in 3.1 core); mode is GL_POINT / GL_LINE / GL_FILL. Both errors
  are GL_INVALID_ENUM with no state change.
- Keep separate front/back slots so GL_POLYGON_MODE round-trips its two
  values (identical under a core context). The raster effect (VkPolygonMode
  + fillModeNonSolid) remains a backend follow-up; this is the state layer.

Tests: two RenderStateSanity round-trips; the glClampColor GL_FIXED_ONLY
acceptance assertion is mutation-verified (rejecting it fails the test).
Full SanityTest sweep green (29/29).
This commit is contained in:
swung0x48
2026-07-10 21:21:40 -04:00
parent e460536119
commit 95876d9d8c
7 changed files with 209 additions and 4 deletions
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MobileGL/MG_Impl/GLImpl/RenderState/GL_RenderState.cpp
+46 -2
View File
@@ -193,7 +193,28 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void PolygonMode_State(GLenum face, GLenum mode) {
// TODO: implement
// GL 3.3 core: separate front/back polygon modes were removed in 3.1, so the only legal
// face is GL_FRONT_AND_BACK. GL_FRONT / GL_BACK must be rejected (some desktop drivers
// leniently accept them, but that is non-conformant). Both errors are GL_INVALID_ENUM and
// leave state untouched.
if (face != GL_FRONT_AND_BACK) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"glPolygonMode face must be GL_FRONT_AND_BACK in the core profile; got " +
MG_Util::ConvertGLEnumToString(face) + "."));
return;
}
if (mode != GL_POINT && mode != GL_LINE && mode != GL_FILL) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"glPolygonMode mode must be GL_POINT, GL_LINE, or GL_FILL; got " +
MG_Util::ConvertGLEnumToString(mode) + "."));
return;
}
// Core sets both faces together; keep two slots so GL_POLYGON_MODE round-trips its two values.
MG_State::pGLContext->SetPolygonMode(mode, mode);
}
void PointSize_State(GLfloat size) {
@@ -503,7 +524,30 @@ namespace MobileGL::MG_Impl::GLImpl {
}
void ClampColor_State(GLenum target, GLenum clamp) {
// TODO: implement
// GL 3.3 core: the only legal target is GL_CLAMP_READ_COLOR. The compatibility-only
// GL_CLAMP_VERTEX_COLOR / GL_CLAMP_FRAGMENT_COLOR were removed from the core profile and
// must be rejected.
if (target != GL_CLAMP_READ_COLOR) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"glClampColor target must be GL_CLAMP_READ_COLOR in the core profile; "
"got " +
MG_Util::ConvertGLEnumToString(target) + "."));
return;
}
// clamp must be one of GL_TRUE, GL_FALSE, or GL_FIXED_ONLY. NOTE: the Khronos man page's
// Errors section wrongly omits GL_FIXED_ONLY, but the spec lists it as legal AND it is the
// default value, so it must be accepted here.
if (clamp != GL_TRUE && clamp != GL_FALSE && clamp != GL_FIXED_ONLY) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"glClampColor clamp must be GL_TRUE, GL_FALSE, or GL_FIXED_ONLY; got " +
MG_Util::ConvertGLEnumToString(clamp) + "."));
return;
}
MG_State::pGLContext->SetClampReadColor(clamp);
}
void BlendFuncSeparate_State(GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha) {