60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include <SDL.h>
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#include <SDL_image.h>
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#include "loadTexture.h"
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GLuint loadTexture(const char *filename)
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{
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GLuint texture;
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SDL_Surface * temp = IMG_Load(filename);
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if (!temp)
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{
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fprintf(stderr, "Failed to load image '%s'!\n", filename);
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return 0;
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}
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SDL_PixelFormat fmt;
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fmt.palette = NULL;
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fmt.BitsPerPixel = 32;
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fmt.BytesPerPixel = 4;
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fmt.Rmask = 0x000000FF;
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fmt.Gmask = 0x0000FF00;
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fmt.Bmask = 0x00FF0000;
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fmt.Amask = 0xFF000000;
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fmt.Rshift = 0;
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fmt.Gshift = 8;
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fmt.Bshift = 16;
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fmt.Ashift = 24;
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SDL_Surface * texsurf = SDL_ConvertSurface(temp, &fmt, SDL_SWSURFACE);
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SDL_FreeSurface(temp);
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if (!texsurf)
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{
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fprintf(stderr, "'%s' was not converted properly!\n", filename);
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return 0;
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}
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unsigned int * pixels =
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malloc(sizeof(unsigned int) * texsurf->w * texsurf->h);
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int y;
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unsigned int dstOffset = texsurf->w * (texsurf->h - 1);
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unsigned int srcOffset = 0;
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for (y = 0; y < texsurf->h; y++)
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{
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memcpy(pixels + dstOffset,
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((unsigned int *)texsurf->pixels) + srcOffset,
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texsurf->w << 2);
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dstOffset -= texsurf->w;
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srcOffset += texsurf->w;
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}
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texsurf->w, texsurf->h, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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SDL_FreeSurface(texsurf);
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free(pixels);
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return texture;
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}
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