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Texture load_texture(Arena *arena, const char *fname, B32 gamma)
{
Texture texture;
U8 *data;
S32 nchannels;
GLenum internal_format;
GLenum data_format;
S32 size;
MEM0STRUCT(&texture);
stbi_set_flip_vertically_on_load(1);
data = stbi_load(fname, &texture.w, &texture.h, &nchannels, 0);
if (!data) {
sys_printf("[ERROR] : Texture : %s : Failed to load\n", fname);
goto end;
}
switch (nchannels) {
case 1:
texture.type = TextureType_R;
internal_format = data_format = GL_RED;
break;
case 3:
texture.type = TextureType_RGB;
internal_format = (gamma) ? GL_SRGB : GL_RGB;
data_format = GL_RGB;
break;
case 4:
texture.type = TextureType_RGBA;
internal_format = (gamma) ? GL_SRGB_ALPHA : GL_RGBA;
data_format = GL_RGBA;
break;
default:
sys_printf("[ERROR] : Texture : %s : Unsupported type\n", fname);
goto end;
}
size = texture.type*texture.w*texture.h;
texture.data = push_arena(arena, size);
MEMCPY(texture.data, data, size);
glGenTextures(1, &texture.id);
glBindTexture(GL_TEXTURE_2D, texture.id);
glTexImage2D(GL_TEXTURE_2D, 0, internal_format, texture.w, texture.h,
0, data_format, GL_UNSIGNED_BYTE, texture.data);
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
sys_printf("[INFO] : Texture : %s : Loaded successfully\n", fname);
end:
stbi_image_free(data);
return texture;
}
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