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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_create_shader(lua_State *L);
int gl_shader_set_source(lua_State *L);
int gl_shader_compile(lua_State *L);
int gl_shader_delete(lua_State *L);
int gl_program_create(lua_State *L);
int gl_program_attach_shader(lua_State *L);
int gl_program_link(lua_State *L);
int gl_program_use(lua_State *L);
int gl_uniform_get_location(lua_State *L);
int gl_uniform_1i(lua_State *L);
int gl_uniform_4f(lua_State *L);
void setup_shader(lua_State *L, int gl_index)
{
int tbl = hs_create_table(L,
/* functions */
hs_str_cfunc("CreateShader", gl_create_shader),
hs_str_cfunc("ShaderSource", gl_shader_set_source),
hs_str_cfunc("CompileShader", gl_shader_compile),
hs_str_cfunc("DeleteShader", gl_shader_delete),
hs_str_cfunc("CreateProgram", gl_program_create),
hs_str_cfunc("AttachShader", gl_program_attach_shader),
hs_str_cfunc("LinkProgram", gl_program_link),
hs_str_cfunc("UseProgram", gl_program_use),
hs_str_cfunc("GetUniformLocation", gl_uniform_get_location),
hs_str_cfunc("Uniform1i", gl_uniform_1i),
hs_str_cfunc("Uniform4f", gl_uniform_4f),
/******** enums ********/
/* shader types */
hs_str_int("VERTEX_SHADER", GL_VERTEX_SHADER),
hs_str_int("FRAGMENT_SHADER", GL_FRAGMENT_SHADER),
);
append_table(L, gl_index, tbl);
lua_pop(L, 1);
}
int gl_create_shader(lua_State *L)
{
lua_Integer type;
hs_parse_args(L, hs_int(type));
lua_Integer shader = glCreateShader(type);
lua_pushinteger(L, shader);
return 1;
}
int gl_shader_set_source(lua_State *L)
{
lua_Integer shader;
char *code;
hs_parse_args(L, hs_int(shader), hs_str(code));
glShaderSource(shader, 1, &code, NULL);
return 0;
}
int gl_shader_compile(lua_State *L)
{
lua_Integer shader;
hs_parse_args(L, hs_int(shader));
glCompileShader(shader);
int success; char log[1024];
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(shader, 1024, NULL, log);
hs_throw_error(L, "shader compilation failed: %s", log);
}
return 0;
}
int gl_shader_delete(lua_State *L)
{
lua_Integer shader;
hs_parse_args(L, hs_int(shader));
glDeleteShader(shader);
return 0;
}
int gl_program_create(lua_State *L)
{
lua_Integer program = glCreateProgram();
lua_pushinteger(L, program);
return 1;
}
int gl_program_attach_shader(lua_State *L)
{
lua_Integer program, shader;
hs_parse_args(L, hs_int(program), hs_int(shader)),
glAttachShader(program, shader);
return 0;
}
int gl_program_link(lua_State *L)
{
lua_Integer program;
hs_parse_args(L, hs_int(program));
glLinkProgram(program);
int success; char log[1024];
glGetProgramiv(program, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(program, 1024, NULL, log);
hs_throw_error(L, "shader linking failed: %s", log);
}
return 0;
}
int gl_program_use(lua_State *L)
{
lua_Integer program;
hs_parse_args(L, hs_int(program));
glUseProgram(program);
return 0;
}
int gl_uniform_get_location(lua_State *L)
{
lua_Integer program;
char *name;
hs_parse_args(L, hs_int(program), hs_str(name));
int location = glGetUniformLocation(program, (const GLchar*)name);
lua_pushinteger(L, location);
return 1;
}
int gl_uniform_1i(lua_State *L)
{
lua_Integer location, v0;
hs_parse_args(L, hs_int(location), hs_int(v0));
glUniform1i(location, v0);
return 0;
}
int gl_uniform_4f(lua_State *L)
{
lua_Integer location;
lua_Number v0, v1, v2, v3;
hs_parse_args(L, hs_int(location), hs_num(v0), hs_num(v1), hs_num(v2), hs_num(v3));
glUniform4f(location, v0, v1, v2, v3);
return 0;
}
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