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#include "gl/glad/glad.h"
#include <GLFW/glfw3.h>
#include <lua.h>
#include <honeysuckle.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_4f(lua_State *L);
void setup_shader(lua_State *L, int gl_index)
{
int shader_types = hs_create_table(L,
hs_str_int("vertexShader", GL_VERTEX_SHADER),
hs_str_int("fragmentShader", GL_FRAGMENT_SHADER),
);
hs_create_table(L,
hs_str_cfunc("create", gl_create_shader),
hs_str_cfunc("setSource", gl_shader_set_source),
hs_str_cfunc("compile", gl_shader_compile),
hs_str_cfunc("delete", gl_shader_delete),
hs_str_cfunc("createProgram", gl_program_create),
hs_str_cfunc("attachShader", gl_program_attach_shader),
hs_str_cfunc("link", gl_program_link),
hs_str_cfunc("use", gl_program_use),
hs_str_cfunc("getUniformLocation", gl_uniform_get_location),
hs_str_cfunc("uniform4f", gl_uniform_4f),
hs_str_tbl("type", shader_types),
);
lua_setfield(L, gl_index, "shader");
}
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_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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