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#include "gl/glad/glad.h"
#include <GLFW/glfw3.h>
#include <lua.h>
#include <honeysuckle.h>
#include "util/util.h"
int gl_set_viewport(lua_State *L);
int gl_draw_arrays(lua_State *L);
int gl_draw_elements(lua_State *L);
int gl_set_clear_color(lua_State *L);
int gl_clear(lua_State *L);
int gl_gen_framebuffers(lua_State *L);
int gl_bind_framebuffer(lua_State *L);
int gl_framebuffer_texture_2d(lua_State *L);
void setup_drawing(lua_State *L, int gl_index)
{
int tbl = hs_create_table(L,
/* functions */
hs_str_cfunc("DrawArrays", gl_draw_arrays),
hs_str_cfunc("DrawElements", gl_draw_elements),
hs_str_cfunc("ClearColor", gl_set_clear_color),
hs_str_cfunc("Clear", gl_clear),
hs_str_cfunc("Viewport", gl_set_viewport),
/******** enums ********/
/* rendering primitives */
hs_str_int("POINTS", GL_POINTS),
hs_str_int("LINES", GL_LINES),
hs_str_int("TRIANGLES", GL_TRIANGLES),
/* clear bitmasks */
hs_str_int("COLOR_BUFFER_BIT", GL_COLOR_BUFFER_BIT),
hs_str_int("DEPTH_BUFFER_BIT", GL_DEPTH_BUFFER_BIT),
hs_str_int("STENCIL_BUFFER_BIT", GL_STENCIL_BUFFER_BIT),
);
append_table(L, gl_index, tbl);
lua_pop(L, 1);
}
int gl_set_clear_color(lua_State *L)
{
lua_Number r, g, b, a;
hs_parse_args(L, hs_num(r), hs_num(g), hs_num(b), hs_num(a));
glClearColor(r, g, b, a);
return 0;
}
int gl_clear(lua_State *L)
{
lua_Integer mask;
hs_parse_args(L, hs_int(mask));
glClear(mask);
return 0;
}
int gl_draw_arrays(lua_State *L)
{
lua_Integer mode, first, count;
hs_parse_args(L, hs_int(mode), hs_int(first), hs_int(count));
glDrawArrays(mode, first, count);
return 0;
}
int gl_draw_elements(lua_State *L)
{
lua_Integer mode, count, type, offset;
hs_parse_args(L, hs_int(mode), hs_int(count), hs_int(type), hs_int(offset));
glDrawElements(mode, count, type, (const void*)offset);
return 0;
}
int gl_set_viewport(lua_State *L)
{
lua_Integer x, y, w, h;
hs_parse_args(L, hs_int(x), hs_int(y), hs_int(w), hs_int(h));
glViewport(x, y, w, h);
return 0;
}
int gl_gen_framebuffers(lua_State *L)
{
int framebuffer;
glGenFramebuffers(1, &framebuffer);
lua_pushinteger(L, framebuffer);
return 1;
}
int gl_bind_framebuffer(lua_State *L)
{
int target = luaL_checkinteger(L, 1);
int framebuffer = luaL_checkinteger(L, 2);
glBindFramebuffer(target, framebuffer);
return 0;
}
int gl_framebuffer_texture_2d(lua_State *L)
{
int target = luaL_checkinteger(L, 1);
int attachment = luaL_checkinteger(L, 2);
int textarget = luaL_checkinteger(L, 3);
int texture = luaL_checkinteger(L, 4);
int level = luaL_checkinteger(L, 5);
glFramebufferTexture2D(target, attachment, textarget, texture, level);
return 0;
}
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