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#include <stdlib.h>
#include <stdbool.h>
#include "gl/glad/glad.h"
#include <GLFW/glfw3.h>
#include <lua.h>
#include <honeysuckle.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)
{
int tbl = hs_create_table(L,
/* functions */
hs_str_cfunc("GenBuffers", gl_create_buffer),
hs_str_cfunc("BindBuffer", gl_bind_buffer),
hs_str_cfunc("BufferData", gl_buffer_data),
hs_str_cfunc("GenVertexArrays", gl_vertex_array_create),
hs_str_cfunc("BindVertexArray", gl_vertex_array_bind),
hs_str_cfunc("VertexAttribPointer", gl_vertex_attrib_pointer),
hs_str_cfunc("EnableVertexAttribArray", gl_vertex_array_enable_attrib),
/******** enums ********/
/* buffer bind targets */
hs_str_int("ARRAY_BUFFER", GL_ARRAY_BUFFER),
hs_str_int("ELEMENT_ARRAY_BUFFER", GL_ELEMENT_ARRAY_BUFFER),
/* buffer usage patters */
hs_str_int("STREAM_DRAW", GL_STREAM_DRAW),
hs_str_int("STATIC_DRAW", GL_STATIC_DRAW),
hs_str_int("DYNAMIC_DRAW", GL_DYNAMIC_DRAW),
);
append_table(L, gl_index, tbl);
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)
{
lua_Integer target, buf;
hs_parse_args(L, hs_int(target), hs_int(buf));
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) \
hs_throw_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)) \
hs_throw_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;
int table;
hs_parse_args(L, hs_int(target), hs_int(type), hs_tbl(table), hs_int(usage));
/* 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:
hs_throw_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;
hs_parse_args(L, hs_int(array));
glBindVertexArray(array);
return 0;
}
int gl_vertex_attrib_pointer(lua_State *L)
{
lua_Integer index, size, stride, offset;
bool normalized;
hs_parse_args(L, hs_int(index), hs_int(size), hs_bool(normalized), hs_int(stride), hs_int(offset));
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;
hs_parse_args(L, hs_int(index));
glEnableVertexAttribArray(index);
return 0;
}
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