ADDED: shaders_basic_lighting

1 files changed, 184 insertions, 0 deletions

diff --git a/examples/shaders/shaders_basic_lighting.c b/examples/shaders/shaders_basic_lighting.c
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+/*******************************************************************************************
+*
+*   raylib [shaders] example - basic lighting
+*
+*   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_DESKTOP)
+    #define GLSL_VERSION            330
+#else   // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
+    #define GLSL_VERSION            100
+#endif
+
+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 - basic lighting");
+
+    // Define the camera to look into our 3d world
+    Camera camera = { 0 };
+    camera.position = (Vector3){ 2.0f, 2.0f, 6.0f };    // Camera position
+    camera.target = (Vector3){ 0.0f, 0.5f, 0.0f };      // Camera looking at point
+    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)
+    camera.fovy = 45.0f;                                // Camera field-of-view Y
+    camera.type = CAMERA_PERSPECTIVE;                   // Camera mode type
+
+    // Load models
+    Model modelA = LoadModelFromMesh(GenMeshTorus(0.4f, 1.0f, 16, 32));
+    Model modelB = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
+    Model modelC = LoadModelFromMesh(GenMeshSphere(0.5f, 32, 32));
+
+    // Load models texture
+    Texture texture = LoadTexture("resources/texel_checker.png");
+
+    // Assign texture to default model material
+    modelA.materials[0].maps[MAP_DIFFUSE].texture = texture;
+    modelB.materials[0].maps[MAP_DIFFUSE].texture = texture;
+    modelC.materials[0].maps[MAP_DIFFUSE].texture = texture;
+
+    Shader shader = LoadShader("resources/shaders/glsl330/basic_lighting.vs", 
+                               "resources/shaders/glsl330/basic_lighting.fs");
+    
+    // Get some shader loactions
+    shader.locs[LOC_MATRIX_MODEL] = GetShaderLocation(shader, "matModel");
+    shader.locs[LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
+
+    // ambient light level
+    int ambientLoc = GetShaderLocation(shader, "ambient");
+    SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, UNIFORM_VEC4);
+    
+    float angle = 6.282f;
+
+    // All models use the same shader
+    modelA.materials[0].shader = shader;
+    modelB.materials[0].shader = shader;
+    modelC.materials[0].shader = shader;
+
+    // Using 4 point lights, white, red, green and blue
+    Light lights[MAX_LIGHTS] = { 0 };
+    lights[0] = CreateLight(LIGHT_POINT, (Vector3){ 4, 2, 4 }, Vector3Zero(), WHITE, shader);
+    lights[1] = CreateLight(LIGHT_POINT, (Vector3){ 4, 2, 4 }, Vector3Zero(), RED, shader);
+    lights[2] = CreateLight(LIGHT_POINT, (Vector3){ 0, 4, 2 }, Vector3Zero(), GREEN, shader);
+    lights[3] = CreateLight(LIGHT_POINT, (Vector3){ 0, 4, 2 }, Vector3Zero(), BLUE, shader);
+
+    SetCameraMode(camera, CAMERA_ORBITAL);  // Set an orbital camera mode
+
+    SetTargetFPS(60);                       // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())            // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsKeyPressed(KEY_W)) { lights[0].enabled = !lights[0].enabled; }
+        if (IsKeyPressed(KEY_R)) { lights[1].enabled = !lights[1].enabled; }
+        if (IsKeyPressed(KEY_G)) { lights[2].enabled = !lights[2].enabled; }
+        if (IsKeyPressed(KEY_B)) { lights[3].enabled = !lights[3].enabled; }
+
+        UpdateCamera(&camera);              // Update camera
+
+        // Make the lights do differing orbits
+        angle -= 0.02;
+        lights[0].position.x = cosf(angle)*4.0f;
+        lights[0].position.z = sinf(angle)*4.0f;
+        lights[1].position.x = cosf(-angle*0.6f)*4.0f;
+        lights[1].position.z = sinf(-angle*0.6f)*4.0f;
+        lights[2].position.y = cosf(angle*0.2f)*4.0f;
+        lights[2].position.z = sinf(angle*0.2f)*4.0f;
+        lights[3].position.y = cosf(-angle*0.35f)*4.0f;
+        lights[3].position.z = sinf(-angle*0.35f)*4.0f;
+        
+        UpdateLightValues(shader, lights[0]);
+        UpdateLightValues(shader, lights[1]);
+        UpdateLightValues(shader, lights[2]);
+        UpdateLightValues(shader, lights[3]);
+
+        // 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
+        float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
+        SetShaderValue(shader, shader.locs[LOC_VECTOR_VIEW], cameraPos, UNIFORM_VEC3);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            BeginMode3D(camera);
+
+                // Draw the three models
+                DrawModel(modelA, Vector3Zero(), 1.0f, WHITE);
+                DrawModel(modelB, (Vector3){-1.6,0,0}, 1.0f, WHITE);
+                DrawModel(modelC, (Vector3){ 1.6,0,0}, 1.0f, WHITE);
+
+                // Draw markers to show where the lights are
+                if (lights[0].enabled) { DrawSphereEx(lights[0].position, 0.2f, 8, 8, WHITE); }
+                if (lights[1].enabled) { DrawSphereEx(lights[1].position, 0.2f, 8, 8, RED); }
+                if (lights[2].enabled) { DrawSphereEx(lights[2].position, 0.2f, 8, 8, GREEN); }
+                if (lights[3].enabled) { DrawSphereEx(lights[3].position, 0.2f, 8, 8, BLUE); }
+
+                DrawGrid(10, 1.0f);
+
+            EndMode3D();
+
+            DrawFPS(10, 10);
+            
+            DrawText("Keys RGB & W toggle lights", 10, 30, 20, DARKGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadModel(modelA);        // Unload the modelA
+    UnloadModel(modelB);        // Unload the modelB
+    UnloadModel(modelC);        // Unload the modelC
+    
+    UnloadTexture(texture);     // Unload the texture
+    UnloadShader(shader);       // Unload shader
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+