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#include "cairo_bindings.h"
#include "texture.h"
int honey_cairo_mt_ref = LUA_NOREF;
static const cairo_user_data_key_t TEXTURE_KEY;
int honey_setup_cairo(lua_State* L)
{
honey_lua_create_table
(L, 2,
HONEY_TABLE, "__index", 2,
HONEY_FUNCTION, "getTexture", honey_cairo_get_texture,
HONEY_FUNCTION, "updateTexture", honey_cairo_update_texture,
HONEY_FUNCTION, "__gc", honey_cairo_destroy);
honey_cairo_mt_ref = luaL_ref(L, LUA_REGISTRYINDEX);
lua_pushcfunction(L, honey_cairo_new);
lua_setfield(L, -2, "cairo");
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
struct texture_ref {
int id;
lua_State* L;
};
static void destroy_texture_ref(void* data)
{
struct texture_ref* ref = data;
luaL_unref(ref->L, LUA_REGISTRYINDEX, ref->id);
free(ref);
}
int honey_cairo_new(lua_State* L)
{
int choice = honey_lua_parse_arguments(L, 2, 0, 1, HONEY_TABLE, NULL);
lua_pushcfunction(L, honey_lua_texture_new);
if (choice == 0)
honey_lua_pcall(L, 0, 1);
else {
lua_pushvalue(L, 1);
honey_lua_pcall(L, 1, 1);
}
/* configure texture swizzling ARGB -> RGBA */
honey_texture* texture = lua_touserdata(L, -1);
glBindTexture(GL_TEXTURE_2D, texture->id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_R, GL_GREEN);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_G, GL_BLUE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_B, GL_ALPHA);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_A, GL_RED);
/* setup texture reference */
struct texture_ref* ref = malloc(sizeof(struct texture_ref));
if (ref == NULL)
honey_lua_throw_error
(L, "failed to allocate memory for texture handle!");
ref->id = luaL_ref(L, LUA_REGISTRYINDEX);
/* create cairo surface */
cairo_surface_t* surface =
cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
texture->params.width,
texture->params.height);
cairo_status_t status = cairo_surface_status(surface);
if (status != CAIRO_STATUS_SUCCESS)
honey_lua_throw_error
(L, "error creating cairo surface: %s", cairo_status_to_string(status));
/* create cairo context */
cairo_t** cr = lua_newuserdata(L, sizeof(cairo_t*));
*cr = cairo_create(surface);
status = cairo_status(*cr);
if (status != CAIRO_STATUS_SUCCESS)
honey_lua_throw_error
(L, "error creating cairo context: %s", cairo_status_to_string(status));
cairo_surface_destroy(surface);
/* bind texture ref to context userdata */
status = cairo_set_user_data(*cr,
&TEXTURE_KEY,
ref,
destroy_texture_ref);
if (status != CAIRO_STATUS_SUCCESS)
honey_lua_throw_error
(L, "error binding cairo texture: %s", cairo_status_to_string(status));
lua_rawgeti(L, LUA_REGISTRYINDEX, honey_cairo_mt_ref);
lua_setmetatable(L, -2);
return 1;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
int honey_cairo_update_texture(lua_State* L)
{
cairo_t** cr;
honey_lua_parse_arguments(L, 1, 1, HONEY_USERDATA, &cr);
struct texture_ref *ref = cairo_get_user_data(*cr, &TEXTURE_KEY);
lua_rawgeti(L, LUA_REGISTRYINDEX, ref->id);
honey_texture* texture = lua_touserdata(L, -1);
lua_pop(L, 1);
cairo_surface_t* surface = cairo_get_target(*cr);
glBindTexture(GL_TEXTURE_2D, texture->id);
unsigned char* image_data = cairo_image_surface_get_data(surface);
glTexSubImage2D(GL_TEXTURE_2D,
0, 0, 0,
texture->params.width,
texture->params.height,
GL_RGBA,
GL_UNSIGNED_BYTE,
image_data);
return 0;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
int honey_cairo_get_texture(lua_State* L)
{
cairo_t** cr;
honey_lua_parse_arguments(L, 1, 1, HONEY_USERDATA, &cr);
struct texture_ref *ref = cairo_get_user_data(*cr, &TEXTURE_KEY);
lua_rawgeti(L, LUA_REGISTRYINDEX, ref->id);
return 1;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
int honey_cairo_destroy(lua_State* L)
{
cairo_surface_t** cr;
honey_lua_parse_arguments(L, 1, 1, HONEY_USERDATA, &cr);
cairo_destroy(*cr);
return 0;
}
/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
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