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/**********************************************************************************************
*
* raylib.lights - Some useful functions to deal with lights data
*
* CONFIGURATION:
*
* #define RLIGHTS_IMPLEMENTATION
* Generates the implementation of the library into the included file.
* If not defined, the library is in header only mode and can be included in other headers
* or source files without problems. But only ONE file should hold the implementation.
*
* LICENSE: zlib/libpng
*
* Copyright (c) 2017-2024 Victor Fisac (@victorfisac) and Ramon Santamaria (@raysan5)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose, including commercial
* applications, and to alter it and redistribute it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not claim that you
* wrote the original software. If you use this software in a product, an acknowledgment
* in the product documentation would be appreciated but is not required.
*
* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
* as being the original software.
*
* 3. This notice may not be removed or altered from any source distribution.
*
**********************************************************************************************/
#ifndef RLIGHTS_H
#define RLIGHTS_H
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#define MAX_LIGHTS 4 // Max dynamic lights supported by shader
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
// Light data
typedef struct {
int type;
bool enabled;
Vector3 position;
Vector3 target;
Color color;
float attenuation;
// Shader locations
int enabledLoc;
int typeLoc;
int positionLoc;
int targetLoc;
int colorLoc;
int attenuationLoc;
} Light;
// Light type
typedef enum {
LIGHT_DIRECTIONAL = 0,
LIGHT_POINT
} LightType;
#ifdef __cplusplus
extern "C" { // Prevents name mangling of functions
#endif
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
Light CreateLight(int type, Vector3 position, Vector3 target, Color color, Shader shader); // Create a light and get shader locations
void UpdateLightValues(Shader shader, Light light); // Send light properties to shader
#ifdef __cplusplus
}
#endif
#endif // RLIGHTS_H
/***********************************************************************************
*
* RLIGHTS IMPLEMENTATION
*
************************************************************************************/
#if defined(RLIGHTS_IMPLEMENTATION)
#include "raylib.h"
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
// ...
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
// ...
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
static int lightsCount = 0; // Current amount of created lights
//----------------------------------------------------------------------------------
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
// ...
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
// Create a light and get shader locations
Light CreateLight(int type, Vector3 position, Vector3 target, Color color, Shader shader)
{
Light light = { 0 };
if (lightsCount < MAX_LIGHTS)
{
light.enabled = true;
light.type = type;
light.position = position;
light.target = target;
light.color = color;
// NOTE: Lighting shader naming must be the provided ones
light.enabledLoc = GetShaderLocation(shader, TextFormat("lights[%i].enabled", lightsCount));
light.typeLoc = GetShaderLocation(shader, TextFormat("lights[%i].type", lightsCount));
light.positionLoc = GetShaderLocation(shader, TextFormat("lights[%i].position", lightsCount));
light.targetLoc = GetShaderLocation(shader, TextFormat("lights[%i].target", lightsCount));
light.colorLoc = GetShaderLocation(shader, TextFormat("lights[%i].color", lightsCount));
UpdateLightValues(shader, light);
lightsCount++;
}
return light;
}
// Send light properties to shader
// NOTE: Light shader locations should be available
void UpdateLightValues(Shader shader, Light light)
{
// Send to shader light enabled state and type
SetShaderValue(shader, light.enabledLoc, &light.enabled, SHADER_UNIFORM_INT);
SetShaderValue(shader, light.typeLoc, &light.type, SHADER_UNIFORM_INT);
// Send to shader light position values
float position[3] = { light.position.x, light.position.y, light.position.z };
SetShaderValue(shader, light.positionLoc, position, SHADER_UNIFORM_VEC3);
// Send to shader light target position values
float target[3] = { light.target.x, light.target.y, light.target.z };
SetShaderValue(shader, light.targetLoc, target, SHADER_UNIFORM_VEC3);
// Send to shader light color values
float color[4] = { (float)light.color.r/(float)255, (float)light.color.g/(float)255,
(float)light.color.b/(float)255, (float)light.color.a/(float)255 };
SetShaderValue(shader, light.colorLoc, color, SHADER_UNIFORM_VEC4);
}
#endif // RLIGHTS_IMPLEMENTATION
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