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#include <stdbool.h>
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <lua.h>
#include <lauxlib.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_1f(lua_State *L);
int gl_uniform_3f(lua_State *L);
int gl_uniform_4f(lua_State *L);
int gl_uniform_matrix_4fv(lua_State *L);
void setup_shader(lua_State *L, int gl_index)
{
struct honey_tbl_t tbl[] = {
/* functions */
H_FUNC("CreateShader", gl_create_shader),
H_FUNC("ShaderSource", gl_shader_set_source),
H_FUNC("CompileShader", gl_shader_compile),
H_FUNC("DeleteShader", gl_shader_delete),
H_FUNC("CreateProgram", gl_program_create),
H_FUNC("AttachShader", gl_program_attach_shader),
H_FUNC("LinkProgram", gl_program_link),
H_FUNC("UseProgram", gl_program_use),
H_FUNC("GetUniformLocation", gl_uniform_get_location),
H_FUNC("Uniform1i", gl_uniform_1i),
H_FUNC("Uniform1f", gl_uniform_1f),
H_FUNC("Uniform3f", gl_uniform_3f),
H_FUNC("Uniform4f", gl_uniform_4f),
H_FUNC("UniformMatrix4fv", gl_uniform_matrix_4fv),
/******** enums ********/
/* shader types */
H_INT("VERTEX_SHADER", GL_VERTEX_SHADER),
H_INT("FRAGMENT_SHADER", GL_FRAGMENT_SHADER),
H_END
};
create_table(L, tbl);
append_table(L, gl_index, lua_gettop(L));
lua_pop(L, 1);
}
int gl_create_shader(lua_State *L)
{
lua_Integer type = luaL_checkinteger(L, 1);
lua_Integer shader = glCreateShader(type);
lua_pushinteger(L, shader);
return 1;
}
int gl_shader_set_source(lua_State *L)
{
lua_Integer shader = luaL_checkinteger(L, 1);
const char *code = luaL_checkstring(L, 2);
glShaderSource(shader, 1, (const GLchar * const*)&code, NULL);
return 0;
}
int gl_shader_compile(lua_State *L)
{
lua_Integer shader = luaL_checkinteger(L, 1);
glCompileShader(shader);
int success; char log[1024];
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderInfoLog(shader, 1024, NULL, log);
luaL_error(L, "shader compilation failed: %s", log);
}
return 0;
}
int gl_shader_delete(lua_State *L)
{
lua_Integer shader = luaL_checkinteger(L, 1);
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;
program = luaL_checkinteger(L, 1);
shader = luaL_checkinteger(L, 2);
glAttachShader(program, shader);
return 0;
}
int gl_program_link(lua_State *L)
{
lua_Integer program = luaL_checkinteger(L, 1);
glLinkProgram(program);
int success; char log[1024];
glGetProgramiv(program, GL_LINK_STATUS, &success);
if (!success) {
glGetProgramInfoLog(program, 1024, NULL, log);
luaL_error(L, "shader linking failed: %s", log);
}
return 0;
}
int gl_program_use(lua_State *L)
{
lua_Integer program = luaL_checkinteger(L, 1);
glUseProgram(program);
return 0;
}
int gl_uniform_get_location(lua_State *L)
{
lua_Integer program = luaL_checkinteger(L, 1);
const char *name = luaL_checkstring(L, 2);
int location = glGetUniformLocation(program, (const GLchar*)name);
lua_pushinteger(L, location);
return 1;
}
int gl_uniform_1i(lua_State *L)
{
lua_Integer location, v0;
location = luaL_checkinteger(L, 1);
v0 = luaL_checkinteger(L, 2);
glUniform1i(location, v0);
return 0;
}
int gl_uniform_1f(lua_State *L)
{
int location = luaL_checkinteger(L, 1);
double value = luaL_checknumber(L, 2);
glUniform1f(location, value);
return 0;
}
int gl_uniform_3f(lua_State *L)
{
int location = luaL_checkinteger(L, 1);
double v0 = luaL_checknumber(L, 2);
double v1 = luaL_checknumber(L, 3);
double v2 = luaL_checknumber(L, 4);
glUniform3f(location, v0, v1, v2);
return 0;
}
int gl_uniform_4f(lua_State *L)
{
lua_Integer location = luaL_checkinteger(L, 1);
lua_Number v0 = luaL_checknumber(L, 2);
lua_Number v1 = luaL_checknumber(L, 3);
lua_Number v2 = luaL_checknumber(L, 4);
lua_Number v3 = luaL_checknumber(L, 5);
glUniform4f(location, v0, v1, v2, v3);
return 0;
}
int gl_uniform_matrix_4fv(lua_State *L)
{
lua_Integer location = luaL_checkinteger(L, 1);
bool transpose = lua_toboolean(L, 2);
float *value = lua_touserdata(L, 3);
glUniformMatrix4fv(location, 1, transpose, value);
return 0;
}
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