42d2a1e091
- Enums now respect GLs defined ranges - Short formats are now correctly supported - Duplicated (and incorrect) enums removed - New conversions supported - Fixes a number of bugs
116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/* KallistiGL for KallistiOS ##version##
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libgl/glu-texture.c
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Copyright (C) 2013-2014 Josh Pearson
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A set of functions for working with ARGB pixel data.
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*/
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#include "gl.h"
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#include "gl-api.h"
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#include "gl-rgb.h"
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#include "glu.h"
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GLAPI GLuint APIENTRY glKosMipMapTexSize(GLuint width, GLuint height) {
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GLuint b = 0;
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while(width >= 1 && height >= 1) {
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b += width * height * 2;
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if(width >= 1)
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width /= 2;
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if(height >= 1)
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height /= 2;
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}
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return b;
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}
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static GLint gluBuild2DBiMipmaps(GLenum target, GLint internalFormat, GLsizei width,
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GLsizei height, GLenum format, GLenum type, const void *data) {
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if(target != GL_TEXTURE_2D)
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return -1;
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if(width < 1 || height < 1)
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return 0;
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uint32 i = 0;
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uint16 x , y;
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uint16 *src = (uint16 *)data;
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uint16 *dst = (uint16 *)data + (width * height);
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for(y = 0; y < height; y += 2) {
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for(x = 0; x < width; x += 2) {
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switch(type) {
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case GL_UNSIGNED_SHORT_5_6_5:
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dst[i++] = __glKosAverageBiPixelRGB565(*src, *(src + 1));
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break;
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case GL_UNSIGNED_SHORT_4_4_4_4:
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dst[i++] = __glKosAverageBiPixelARGB4444(*src, *(src + 1));
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break;
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case GL_UNSIGNED_SHORT_1_5_5_5_REV:
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dst[i++] = __glKosAverageBiPixelARGB1555(*src, *(src + 1));
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break;
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}
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src += 2;
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}
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src += width;
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}
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return gluBuild2DBiMipmaps(target, internalFormat, width / 2, height / 2,
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format, type, (uint16 *)data + (width * height));
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}
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GLint APIENTRY gluBuild2DMipmaps(GLenum target, GLint internalFormat, GLsizei width,
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GLsizei height, GLenum format, GLenum type, const void *data) {
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if(target != GL_TEXTURE_2D)
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return -1;
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if(type != GL_UNSIGNED_SHORT_5_6_5 && type != GL_UNSIGNED_SHORT_4_4_4_4
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&& type != GL_UNSIGNED_SHORT_1_5_5_5_REV)
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return -1;
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if(width < 1 || height < 1)
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return 0;
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if(width == 1 || height == 1)
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return gluBuild2DBiMipmaps(target, internalFormat, width, height, format, type, data);
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uint32 i = 0;
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uint16 x, y;
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uint16 *src = (uint16 *)data;
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uint16 *dst = (uint16 *)data + (width * height);
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for(y = 0; y < height; y += 2) {
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for(x = 0; x < width; x += 2) {
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switch(type) {
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case GL_UNSIGNED_SHORT_5_6_5:
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dst[i++] = __glKosAverageQuadPixelRGB565(*src, *(src + 1), *(src + width), *(src + width + 1));
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break;
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case GL_UNSIGNED_SHORT_4_4_4_4:
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dst[i++] = __glKosAverageQuadPixelARGB4444(*src, *(src + 1), *(src + width), *(src + width + 1));
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break;
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case GL_UNSIGNED_SHORT_1_5_5_5_REV:
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dst[i++] = __glKosAverageQuadPixelARGB1555(*src, *(src + 1), *(src + width), *(src + width + 1));
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break;
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}
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src += 2;
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}
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src += width;
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}
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return gluBuild2DMipmaps(target, internalFormat, width / 2, height / 2,
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format, type, (uint16 *)data + (width * height));
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}
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