/** @file shader.h
 * 
 * @brief Functions to create, manipulate, and destroy GLSL shaders. 
 */

#ifndef HONEY_SHADER_H
#define HONEY_SHADER_H

#include "common.h"

extern int honey_shader_mt_ref;

/** @brief Push the shader table to the lua stack.
 */
void honey_setup_shader(lua_State* L);

/** @brief Create a new shader from source.
 *
 * @param[in] vertex_source The GLSL code for the vertex shader.
 * @param[in] fragment_source The GLSL code for the fragment shader.
 *
 * @returns OpenGL handle for the compiled shader.
 */
int honey_shader_new(lua_State* L);

/** @brief Set a shader as the current OpenGL shader.
 *
 * @param[in] shader The OpenGL handle to a shader, as generated by honey.shader.new
 *
 * @returns Nothing.
 */
int honey_shader_use(lua_State* L);

/** @brief Set an integer uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_int(lua_State* L);

/** @brief Set a float uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_float(lua_State* L);

/** @brief Set a vec3 uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_vec3(lua_State* L);

/** @brief Set a vec4 uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_vec4(lua_State* L);

/** @brief Set a mat3 uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_mat3(lua_State* L);

/** @brief Set a mat4 uniform on a shader.
 *
 * @param[in] shader The OpenGL shader handle.
 * @param[in] name The name of the shader uniform as a string.
 * @param[in] value The value to set the uniform to.
 *
 * @returns Nothing.
 */
int honey_shader_set_mat4(lua_State* L);

/** @brief Delete a shader.
 *
 * @param[in] shader An OpenGL shader handle.
 *
 * @returns Nothing.
 */
int honey_shader_delete(lua_State* L);

#endif