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[Fix] (EGL+GL): let ANGLE's GL backend run on MobileGL (GBM displays, foreign wl_display, precision query, ES-free GL_VERSION)

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swung0x48
2026-10-02 02:58:55 -04:00
parent 47db68d557
commit 0b6842ac8b
8 changed files with 107 additions and 5 deletions
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MobileGL/MG_Impl/GLImpl/Program/GL_Program.cpp
+41
View File
@@ -2405,6 +2405,47 @@ namespace MobileGL::MG_Impl::GLImpl {
ShaderBinary_State(count, shaders, binaryformat, binary, length);
}
// GL 4.6 core 7.13 (ARB_ES2_compatibility). The shading language here is desktop GLSL, whose
// float and int are 32-bit IEEE-754 / two's complement at every precision qualifier, so every
// precision answers the same: log2 of the range and the mantissa bits. A silent stub answered
// zeros, which an ES-on-GL layer reads as "no highp" and refuses ES 2.0 outright.
void GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype, GLint* range, GLint* precision) {
if (shadertype != GL_VERTEX_SHADER && shadertype != GL_FRAGMENT_SHADER) {
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
"shadertype must be GL_VERTEX_SHADER or GL_FRAGMENT_SHADER."));
return;
}
GLint rangeLow = 0, rangeHigh = 0, bits = 0;
switch (precisiontype) {
case GL_LOW_FLOAT:
case GL_MEDIUM_FLOAT:
case GL_HIGH_FLOAT:
rangeLow = 127;
rangeHigh = 127;
bits = 23;
break;
case GL_LOW_INT:
case GL_MEDIUM_INT:
case GL_HIGH_INT:
rangeLow = 31;
rangeHigh = 30;
bits = 0;
break;
default:
MG_State::pGLContext->RecordError(
ErrorCode::InvalidEnum,
MakeUnique<GenericErrorInfo>("MG_Impl/GLImpl", __func__, "precisiontype is not a precision."));
return;
}
if (range) {
range[0] = rangeLow;
range[1] = rangeHigh;
}
if (precision) *precision = bits;
}
void SpecializeShader(GLuint shader, const GLchar* pEntryPoint, GLuint numSpecializationConstants,
const GLuint* pConstantIndex, const GLuint* pConstantValue) {
SpecializeShader_State(shader, pEntryPoint, numSpecializationConstants, pConstantIndex, pConstantValue);
MobileGL/MG_Impl/GLImpl/Program/GL_Program.h
+1
View File
@@ -41,6 +41,7 @@ namespace MobileGL::MG_Impl::GLImpl {
void GetShaderiv(GLuint shader, GLenum pname, GLint* params);
void GetShaderInfoLog(GLuint shader, GLsizei bufSize, GLsizei* length, GLchar* infoLog);
void GetShaderSource(GLuint shader, GLsizei bufSize, GLsizei* length, GLchar* source);
void GetShaderPrecisionFormat(GLenum shadertype, GLenum precisiontype, GLint* range, GLint* precision);
GLint GetUniformLocation(GLuint program, const GLchar* name);
void GetUniformfv(GLuint program, GLint location, GLfloat* params);
void GetUniformiv(GLuint program, GLint location, GLint* params);