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Texture load_texture(Arena *arena, char *filename, B32 gamma_correction)
{
U8 *data;
S32 nchannels;
GLenum internal_format;
GLenum data_format;
Texture texture;
Arena *temparena;
char *cfilename;
Str8 str;
Assert(arena);
MemoryZeroStruct(&texture);
temparena = arena_alloc(0);
cfilename = str8tocstr(arena, filename);
stbi_set_flip_vertically_on_load(1);
data = stbi_load(cfilename, &texture.width, &texture.height, &nchannels, 0);
if (!data) {
str = str8pushf(temparena, "[ERROR] : Texture : %s : Failed to load\n", cfilename);
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_correction) ? GL_SRGB : GL_RGB;
data_format = GL_RGB;
break;
case 4:
texture.type = TextureType_RGBA;
internal_format = (gamma_correction) ? GL_SRGB_ALPHA : GL_RGBA;
data_format = GL_RGBA;
break;
default:
str = str8pushf(temparena, "[ERROR] : Texture : %s : Unsupported type\n", cfilename);
goto end;
}
glGenTextures(1, &texture.id);
glBindTexture(GL_TEXTURE_2D, texture.id);
glTexImage2D(GL_TEXTURE_2D, 0, internal_format, texture.width, texture.height, 0, data_format, GL_UNSIGNED_BYTE, 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);
str = str8pushf(temparena, "[INFO] : Texture : %s : Loaded successfully\n", cfilename);
end:
str8print(str);
stbi_image_free(data);
arena_release(temparena);
return texture;
}
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