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[Feat] (MG_State, MG_Util, MG_Impl/GLImpl, MG_Backend/DirectGLES): desktop-GL single-channel client formats GL_GREEN/GL_BLUE/GL_ALPHA and _INTEGER variants - validate and readback via wide-RGBA channel extraction (GL CTS packed_pixels rgba8_format_green/blue read with them), unpack GREEN/BLUE(_INTEGER) TexImage uploads into the named channel with 0/1 defaults per table 3.3; GL_ALPHA keeps the legacy Red upload mapping (R8 storage + 000R swizzle), its readback corrected at the backend to source channel 3

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swung0x48
2026-07-16 06:47:33 -04:00
parent bae222227a
commit 1cefb9780b
12 changed files with 220 additions and 2 deletions
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MobileGL/MG_Backend/DirectGLES/DirectGLES.cpp
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@@ -3284,6 +3284,16 @@ namespace MobileGL::MG_Backend::DirectGLES {
switch (format) {
case GL_RED: outMapping = {{0, 0, 0, 0}, 1, false}; return true;
case GL_RED_INTEGER: outMapping = {{0, 0, 0, 0}, 1, true}; return true;
// Desktop-GL single-channel client formats (GL CTS packed_pixels rgba8_format_green/blue):
// the destination holds one component sourced from the named channel of the wide RGBA read.
// GL_ALPHA is mapped here from the raw enum because the state layer folds it into Red for the
// legacy alpha-texture upload hack.
case GL_GREEN: outMapping = {{1, 0, 0, 0}, 1, false}; return true;
case GL_GREEN_INTEGER: outMapping = {{1, 0, 0, 0}, 1, true}; return true;
case GL_BLUE: outMapping = {{2, 0, 0, 0}, 1, false}; return true;
case GL_BLUE_INTEGER: outMapping = {{2, 0, 0, 0}, 1, true}; return true;
case GL_ALPHA: outMapping = {{3, 0, 0, 0}, 1, false}; return true;
case GL_ALPHA_INTEGER: outMapping = {{3, 0, 0, 0}, 1, true}; return true;
case GL_RG: outMapping = {{0, 1, 0, 0}, 2, false}; return true;
case GL_RG_INTEGER: outMapping = {{0, 1, 0, 0}, 2, true}; return true;
case GL_RGB: outMapping = {{0, 1, 2, 0}, 3, false}; return true;