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#include <stdlib.h>
#include <stdbool.h>
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <lua.h>
#include <lauxlib.h>
#include "util/util.h"
#include "gl.h"
int gl_create_buffer(lua_State *L);
int gl_bind_buffer(lua_State *L);
int gl_buffer_data(lua_State *L);
int gl_vertex_array_create(lua_State *L);
int gl_vertex_array_bind(lua_State *L);
int gl_vertex_attrib_pointer(lua_State *L);
int gl_vertex_array_enable_attrib(lua_State *L);
void setup_data(lua_State *L, int gl_index)
{
struct honey_tbl_t tbl[] = {
/* functions */
H_FUNC("GenBuffers", gl_create_buffer),
H_FUNC("BindBuffer", gl_bind_buffer),
H_FUNC("BufferData", gl_buffer_data),
H_FUNC("GenVertexArrays", gl_vertex_array_create),
H_FUNC("BindVertexArray", gl_vertex_array_bind),
H_FUNC("VertexAttribPointer", gl_vertex_attrib_pointer),
H_FUNC("EnableVertexAttribArray", gl_vertex_array_enable_attrib),
/******** enums ********/
/* buffer bind targets */
H_INT("ARRAY_BUFFER", GL_ARRAY_BUFFER),
H_INT("ELEMENT_ARRAY_BUFFER", GL_ELEMENT_ARRAY_BUFFER),
/* buffer usage patters */
H_INT("STREAM_DRAW", GL_STREAM_DRAW),
H_INT("STATIC_DRAW", GL_STATIC_DRAW),
H_INT("DYNAMIC_DRAW", GL_DYNAMIC_DRAW),
H_END
};
create_table(L, tbl);
append_table(L, gl_index, lua_gettop(L));
lua_pop(L, 1);
}
int gl_create_buffer(lua_State *L)
{
int buf;
glGenBuffers(1, &buf);
lua_pushinteger(L, buf);
return 1;
}
int gl_bind_buffer(lua_State *L)
{
int target = luaL_checkinteger(L, 1);
int buf = luaL_checkinteger(L, 2);
glBindBuffer(target, buf);
return 0;
}
#define GET_BUFFER_TYPE(type, name, conversion) \
void * get_buffer_ ## name (lua_State *L, size_t *sz, int tbl) { \
size_t len = lua_objlen(L, tbl); \
*sz = len * sizeof(type); \
type *buf = malloc(*sz); \
if (buf == NULL) \
luaL_error(L, "failed to allocate intermediary buffer"); \
for (int i=0; i<len; i++) { \
lua_rawgeti(L, tbl, i+1); \
if (!lua_isnumber(L, -1)) \
luaL_error(L, "all elements must be numbers (failed at index %d)", i); \
buf[i] = conversion(L, -1); \
lua_pop(L, 1); \
} \
return buf; \
}
GET_BUFFER_TYPE(unsigned int, uint, lua_tointeger)
GET_BUFFER_TYPE(int, int, lua_tointeger)
GET_BUFFER_TYPE(float, float, lua_tonumber)
int gl_buffer_data(lua_State *L)
{
lua_Integer target, type, usage;
target = luaL_checkinteger(L, 1);
type = luaL_checkinteger(L, 2);
luaL_checktype(L, 3, LUA_TTABLE);
int table = 3;
usage = luaL_checkinteger(L, 4);
/* build raw buffer */
void *buf; size_t len;
switch(type) {
case GL_UNSIGNED_INT:
buf = get_buffer_uint(L, &len, table);
break;
case GL_INT:
buf = get_buffer_int(L, &len, table);
break;
case GL_FLOAT:
buf = get_buffer_float(L, &len, table);
break;
default:
luaL_error(L, "invalid type");
}
/* call */
glBufferData(target, len, buf, usage);
free(buf);
return 0;
}
int gl_vertex_array_create(lua_State *L)
{
int array;
glGenVertexArrays(1, &array);
lua_pushinteger(L, array);
return 1;
}
int gl_vertex_array_bind(lua_State *L)
{
lua_Integer array = luaL_checkinteger(L, 1);
glBindVertexArray(array);
return 0;
}
int gl_vertex_attrib_pointer(lua_State *L)
{
lua_Integer index, size, stride, offset;
bool normalized;
index = luaL_checkinteger(L, 1);
size = luaL_checkinteger(L, 2);
normalized = lua_toboolean(L, 3);
stride = luaL_checkinteger(L, 4);
offset = luaL_checkinteger(L, 5);
glVertexAttribPointer(index, size, GL_FLOAT,
normalized, stride*sizeof(float),
(void*) (offset*sizeof(float)));
return 0;
}
int gl_vertex_array_enable_attrib(lua_State *L)
{
lua_Integer index = luaL_checkinteger(L, 1);
glEnableVertexAttribArray(index);
return 0;
}
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