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Implement conversions to RGBA8

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This commit is contained in:
Luke Benstead 2018-09-20 15:08:06 +01:00
parent 21ad46ad94
commit 741707ac85
1 changed files with 28 additions and 0 deletions
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28
GL/texture.c
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@ -464,6 +464,15 @@ static void _rgba8888_to_argb4444(const GLubyte* source, GLushort* dest) {
*dest = (source[3] & 0xF0) << 8 | (source[0] & 0xF0) << 4 | (source[1] & 0xF0) | (source[2] & 0xF0) >> 4;
}
static void _rgba8888_to_rgba8888(const GLubyte* source, GLushort* dest) {
/* Noop */
GLubyte* dst = (GLubyte*) dest;
dst[0] = source[0];
dst[1] = source[1];
dst[2] = source[2];
dst[3] = source[3];
}
static void _rgb888_to_rgb565(const GLubyte* source, GLushort* dest) {
*dest = ((source[0] & 0b11111000) << 8) | ((source[1] & 0b11111100) << 3) | (source[2] >> 3);
}
@ -481,6 +490,16 @@ static void _rgba4444_to_argb4444(const GLubyte* source, GLushort* dest) {
*dest = ((*src & 0x000F) << 12) | *src >> 4;
}
static void _rgba4444_to_rgba8888(const GLubyte* source, GLushort* dest) {
GLushort src = *((GLushort*) source);
GLubyte* dst = (GLubyte*) dest;
dst[0] = (src & 0xF000) * 2;
dst[1] = (src & 0x0F00) * 2;
dst[2] = (src & 0x00F0) * 2;
dst[3] = (src & 0x000F) * 2;
}
static TextureConversionFunc _determineConversion(GLint internalFormat, GLenum format, GLenum type) {
switch(internalFormat) {
case GL_ALPHA: {
@ -514,6 +533,15 @@ static TextureConversionFunc _determineConversion(GLint internalFormat, GLenum f
return _rgba4444_to_argb4444;
}
} break;
case GL_RGBA8: {
if(type == GL_UNSIGNED_BYTE && format == GL_RGBA) {
return _rgba8888_to_rgba8888;
} else if (type == GL_BYTE && format == GL_RGBA) {
return _rgba8888_to_rgba8888;
} else if(type == GL_UNSIGNED_SHORT_4_4_4_4 && format == GL_RGBA) {
return _rgba4444_to_rgba8888;
}
} break;
default:
fprintf(stderr, "Unsupported conversion: %x -> %x, %x\n", internalFormat, format, type);
break;