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/*******************************************************************************************
*
* raylib [shaders] example - fog
*
* NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
* OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
*
* NOTE: Shaders used in this example are #version 330 (OpenGL 3.3).
*
* This example has been created using raylib 2.5 (www.raylib.com)
* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
* Example contributed by Chris Camacho (@codifies) and reviewed by Ramon Santamaria (@raysan5)
*
* Chris Camacho (@codifies - http://bedroomcoders.co.uk/) notes:
*
* This is based on the PBR lighting example, but greatly simplified to aid learning...
* actually there is very little of the PBR example left!
* When I first looked at the bewildering complexity of the PBR example I feared
* I would never understand how I could do simple lighting with raylib however its
* a testement to the authors of raylib (including rlights.h) that the example
* came together fairly quickly.
*
* Copyright (c) 2019 Chris Camacho (@codifies) and Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#define RLIGHTS_IMPLEMENTATION
#include "rlights.h"
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h>
#endif
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
static Camera camera = { 0 };
static Model modelA = { 0 };
static Model modelB = { 0 };
static Model modelC = { 0 };
static Shader shader = { 0 };
static Texture texture = { 0 };
static int ambientLoc = 0;
static float fogDensity = 0.15f;
static int fogDensityLoc = 0;
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void); // Update and Draw one frame
//----------------------------------------------------------------------------------
// Program Main Entry Point
//----------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
SetConfigFlags(FLAG_MSAA_4X_HINT); // Enable Multi Sampling Anti Aliasing 4x (if available)
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - fog");
// Define the camera to look into our 3d world
camera.position = (Vector3){ 2.0f, 2.0f, 6.0f };
camera.target = (Vector3){ 0.0f, 0.5f, 0.0f };
camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
camera.fovy = 45.0f;
camera.type = CAMERA_PERSPECTIVE;
// Load models and texture
modelA = LoadModelFromMesh(GenMeshTorus(0.4f, 1.0f, 16, 32));
modelB = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
modelC = LoadModelFromMesh(GenMeshSphere(0.5f, 32, 32));
texture = LoadTexture("resources/texel_checker.png");
// Assign texture to default model material
modelA.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;
modelB.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;
modelC.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture = texture;
// Load shader and set up some uniforms
shader = LoadShader(TextFormat("resources/shaders/glsl%i/base_lighting.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/fog.fs", GLSL_VERSION));
shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocation(shader, "matModel");
shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
// Ambient light level
ambientLoc = GetShaderLocation(shader, "ambient");
SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);
fogDensityLoc = GetShaderLocation(shader, "fogDensity");
SetShaderValue(shader, fogDensityLoc, &fogDensity, SHADER_UNIFORM_FLOAT);
// NOTE: All models share the same shader
modelA.materials[0].shader = shader;
modelB.materials[0].shader = shader;
modelC.materials[0].shader = shader;
// Using just 1 point lights
CreateLight(LIGHT_POINT, (Vector3){ 0, 2, 6 }, Vector3Zero(), WHITE, shader);
SetCameraMode(camera, CAMERA_ORBITAL); // Set an orbital camera mode
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(UpdateDrawFrame, 60, 1);
#else
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
UpdateDrawFrame();
}
#endif
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadModel(modelA); // Unload the model A
UnloadModel(modelB); // Unload the model B
UnloadModel(modelC); // Unload the model C
UnloadTexture(texture); // Unload the texture
UnloadShader(shader); // Unload shader
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
//----------------------------------------------------------------------------------
// Module Functions Definitions
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
// Update
//----------------------------------------------------------------------------------
UpdateCamera(&camera); // Update camera
if (IsKeyDown(KEY_UP))
{
fogDensity += 0.001;
if (fogDensity > 1.0) fogDensity = 1.0;
}
if (IsKeyDown(KEY_DOWN))
{
fogDensity -= 0.001;
if (fogDensity < 0.0) fogDensity = 0.0;
}
SetShaderValue(shader, fogDensityLoc, &fogDensity, SHADER_UNIFORM_FLOAT);
// Rotate the torus
modelA.transform = MatrixMultiply(modelA.transform, MatrixRotateX(-0.025));
modelA.transform = MatrixMultiply(modelA.transform, MatrixRotateZ(0.012));
// Update the light shader with the camera view position
SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], &camera.position.x, SHADER_UNIFORM_VEC3);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(GRAY);
BeginMode3D(camera);
// Draw the three models
DrawModel(modelA, Vector3Zero(), 1.0f, WHITE);
DrawModel(modelB, (Vector3){ -2.6, 0, 0 }, 1.0f, WHITE);
DrawModel(modelC, (Vector3){ 2.6, 0, 0 }, 1.0f, WHITE);
for (int i = -20; i < 20; i += 2) DrawModel(modelA,(Vector3){ i, 0, 2 }, 1.0f, WHITE);
EndMode3D();
DrawText(TextFormat("Use KEY_UP/KEY_DOWN to change fog density [%.2f]", fogDensity), 10, 10, 20, RAYWHITE);
EndDrawing();
//----------------------------------------------------------------------------------
}
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