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Use GL_LUMINANCE8 for 3d palette lookup texture on OpenGL versions older than 3.0

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Fixes white screen when the GL_R8 format is not available
This commit is contained in:
Hannu Hanhi 2021-09-17 22:19:51 +03:00
parent f7a8bedec1
commit 0894547d1a
1 changed files with 14 additions and 1 deletions
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15
src/hardware/r_opengl/r_opengl.c
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@ -3262,13 +3262,26 @@ EXPORT void HWRAPI(DrawScreenFinalTexture)(int tex, int width, int height)
EXPORT void HWRAPI(SetPaletteLookup)(UINT8 *lut)
{
GLenum internalFormat;
if (gl_version[0] == '1' || gl_version[0] == '2')
{
// if the OpenGL version is below 3.0, then the GL_R8 format may not be available.
// so use GL_LUMINANCE8 instead to get a single component 8-bit format
// (it is possible to have access to shaders even in some OpenGL 1.x systems,
// so palette rendering can still possibly be achieved there)
internalFormat = GL_LUMINANCE8;
}
else
{
internalFormat = GL_R8;
}
if (!paletteLookupTex)
pglGenTextures(1, &paletteLookupTex);
pglActiveTexture(GL_TEXTURE1);
pglBindTexture(GL_TEXTURE_3D, paletteLookupTex);
pglTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
pglTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
pglTexImage3D(GL_TEXTURE_3D, 0, GL_R8, HWR_PALETTE_LUT_SIZE, HWR_PALETTE_LUT_SIZE, HWR_PALETTE_LUT_SIZE,
pglTexImage3D(GL_TEXTURE_3D, 0, internalFormat, HWR_PALETTE_LUT_SIZE, HWR_PALETTE_LUT_SIZE, HWR_PALETTE_LUT_SIZE,
0, GL_RED, GL_UNSIGNED_BYTE, lut);
pglActiveTexture(GL_TEXTURE0);
}