69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <GearSrc/GL.h>
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#include <GearSrc/File.h>
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#include <stb_image.h>
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void GSGLTexturePrepare(GSGL gl, GLuint* texture, unsigned char* rgba, int width, int height) {
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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, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void GSGLTextureEnable(GSGL gl, GLuint texture) {
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glBindTexture(GL_TEXTURE_2D, texture);
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glEnable(GL_TEXTURE_2D);
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}
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void GSGLTextureDisable(GSGL gl, GLuint texture) {
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glDisable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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int GSGLTextureLoadFile(GSGL gl, GLuint* texture, int* width, int* height, const char* filename) {
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GSFile f = GSFileOpen(gl->engine, filename);
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unsigned char* data;
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unsigned char* rgba;
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unsigned long sz;
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int ch;
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int st = 1;
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int w, h;
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if(f == NULL) return 0;
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sz = GSFileSize(f);
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data = malloc(sz);
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GSFileRead(f, data, sz);
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GSFileClose(f);
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if((rgba = stbi_load_from_memory(data, sz, &w, &h, &ch, 4)) == NULL) {
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st = 0;
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} else {
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GSGLTexturePrepare(gl, texture, rgba, w, h);
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free(rgba);
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}
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if(width != NULL) *width = w;
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if(height != NULL) *height = h;
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free(data);
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return st;
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}
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void GSGLTextureSet(GSGL gl, GLuint texture) {
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glBindTexture(GL_TEXTURE_2D, texture);
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if(texture == 0) {
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glDisable(GL_TEXTURE_2D);
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} else {
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glEnable(GL_TEXTURE_2D);
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}
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}
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void GSGLTextureDelete(GSGL gl, GLuint texture) {
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glDeleteTextures(1, &texture);
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}
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