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#include "texture.h"
static int honey_lua_texture_new(lua_State* L)
{
honey_texture* texture = lua_newuserdata(L, sizeof(honey_texture));
return 1;
}
static int honey_lua_texture_load(lua_State* L)
{
honey_texture* texture;
char* texture_path;
bool use_alpha;
honey_lua_parse_arguments(L, 3,
HONEY_USERDATA, &texture,
HONEY_STRING, &texture_path,
HONEY_BOOLEAN, &use_alpha);
enum honey_texture_result result = honey_texture_load(texture, texture_path, use_alpha);
if (result != TEXTURE_OK) {
char* error;
honey_format_string(&error,
"failed to load '%s'",
texture_path);
lua_pushstring(L, error);
free(error);
lua_error(L);
}
return 0;
}
static int honey_lua_texture_use(lua_State* L)
{
honey_texture* texture;
int texture_unit;
honey_lua_parse_arguments(L, 2,
HONEY_USERDATA, &texture,
HONEY_INTEGER, &texture_unit);
honey_texture_use(*texture, texture_unit);
return 0;
}
void honey_setup_texture(lua_State* L)
{
honey_lua_element texture_elements[] = {
{ "new", HONEY_FUNCTION, { .function = honey_lua_texture_new } },
{ "load", HONEY_FUNCTION, { .function = honey_lua_texture_load } },
{ "use", HONEY_FUNCTION, { .function = honey_lua_texture_use } },
};
honey_lua_create_table(L, texture_elements, 3);
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
enum honey_texture_result honey_texture_load(honey_texture* texture,
char* texture_path,
bool alpha_channel) {
unsigned int texture_id;
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE_2D, texture_id);
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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
int width, height, channels;
unsigned char* image_data = stbi_load(texture_path, &width, &height, &channels, 0);
if (image_data == NULL) {
fprintf(stderr, "ERROR: failed to load '%s'\n", texture_path);
return TEXTURE_FAILED;
}
if (alpha_channel) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image_data);
}
else {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image_data);
}
glGenerateMipmap(GL_TEXTURE_2D);
stbi_image_free(image_data);
(*texture).texture_id = texture_id;
(*texture).width = width;
(*texture).height = height;
(*texture).channels = channels;
return TEXTURE_OK;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
void honey_texture_use(honey_texture texture, int texture_unit) {
glActiveTexture(GL_TEXTURE0 + texture_unit);
glBindTexture(GL_TEXTURE_2D, texture.texture_id);
}
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