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This commit is contained in:
Nishi 2026-01-12 01:03:18 +09:00
commit 57685ed075
Signed by: nishi
GPG key ID: 27EF69B208EB9343
20 changed files with 282 additions and 13 deletions
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70
engine/src/gl_texture.c
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@ -1,6 +1,29 @@
#include <GearBox/GL.h>
int GBGLTexturePrepare(GBGL gl, GLuint* texture, unsigned char* rgba, int width, int height) {
#include <GearBox/File.h>
#include <stb_image.h>
void GBGLTexturePrepare(GBGL gl, GLuint* texture, unsigned char* rgba, int width, int height) {
int y;
/* image gets flipped here... because opengl coord system is quite confusing */
for(y = 0; y < height / 2; y++) {
int x;
for(x = 0; x < width; x++) {
int p;
for(p = 0; p < 4; p++) {
unsigned char* s1 = &rgba[(y * width + x) * 4 + p];
unsigned char* s2 = &rgba[((height - 1 - y) * width + x) * 4 + p];
unsigned char p1 = *s1;
unsigned char p2 = *s2;
*s2 = p1;
*s1 = p2;
}
}
}
glGenTextures(1, texture);
glBindTexture(GL_TEXTURE_2D, *texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, rgba);
@ -18,3 +41,48 @@ void GBGLTextureDisable(GBGL gl, GLuint texture) {
glDisable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
}
int GBGLTextureLoadFile(GBGL gl, GLuint* texture, int* width, int* height, const char* filename) {
GBFile f = GBFileOpen(gl->engine, filename);
unsigned char* data;
unsigned char* rgba;
unsigned long sz;
int ch;
int st = 1;
int w, h;
if(f == NULL) return 0;
sz = GBFileSize(f);
data = malloc(sz);
GBFileRead(f, data, sz);
GBFileClose(f);
if((rgba = stbi_load_from_memory(data, sz, &w, &h, &ch, 4)) == NULL) {
st = 0;
} else {
GBGLTexturePrepare(gl, texture, rgba, w, h);
free(rgba);
}
if(width != NULL) *width = w;
if(height != NULL) *height = h;
free(data);
return st;
}
void GBGLTextureSet(GBGL gl, GLuint texture) {
glBindTexture(GL_TEXTURE_2D, texture);
if(texture == 0) {
glDisable(GL_TEXTURE_2D);
} else {
glEnable(GL_TEXTURE_2D);
}
}
void GBGLTextureDelete(GBGL gl, GLuint texture) {
glDeleteTextures(1, &texture);
}