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[Feat] (MG_Backend/DirectGLES): add proper handling when internalformat is GL_R16

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swung0x48
2026-01-04 16:03:50 +08:00
parent 28c15148f2
commit b281afe665
1 changed files with 19 additions and 1 deletions
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MobileGL/MG_Backend/DirectGLES/Utils.cpp
+19 -1
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@@ -257,7 +257,24 @@ namespace MobileGL::MG_Backend::DirectGLES {
if (outType) *outType = GL_HALF_FLOAT;
if (outFormat) *outFormat = GL_RG;
break;
case GL_R16:
/* TODO: By using R16F as R16, we're losing ~5bit precision along the way,
* deal with this later.
* This R16F as R16 conversion should only be applied on ES,
* see: https://registry.khronos.org/OpenGL/extensions/OES/OES_texture_buffer.txt
* ```
* Issues:
* (6) Should the R16, RG16 and RGBA16 texture formats be supported?
RESOLVED. No. OpenGL ES 3.0 does not support these formats. They were
considered for late addition to OpenGL ES 3.1 in Bug 11366, but didn't
make the cut. In the absence of another extension to add them, they
are not supported here either.
```
*/
if (outInternalFormat) *outInternalFormat = GL_R16F;
if (outType) *outType = GL_FLOAT;
if (outFormat) *outFormat = GL_RED;
break;
case GL_R8:
if (outInternalFormat) *outInternalFormat = internalFormat;
if (outType) *outType = GL_UNSIGNED_BYTE;
@@ -370,6 +387,7 @@ namespace MobileGL::MG_Backend::DirectGLES {
break;
default:
MGLOG_E("NormalizePixelFormat: unhandled internalFormat: %s", MG_Util::ConvertGLEnumToString(internalFormat).c_str());
// Fallback handling for other formats
if (outInternalFormat) *outInternalFormat = internalFormat;
if (outType) *outType = GL_UNSIGNED_BYTE; // More reasonable default