RENAMED: example: shaders_mesh_instancing

shaders_rlgl_mesh_instanced -> shaders_mesh_instancing

1 files changed, 222 insertions, 0 deletions

diff --git a/examples/shaders/shaders_mesh_instancing.c b/examples/shaders/shaders_mesh_instancing.c
new file mode 100644
index 00000000..95548234
--- /dev/null
+++ b/examples/shaders/shaders_mesh_instancing.c
@@ -0,0 +1,222 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - mesh instancing
+*
+*   This example has been created using raylib 3.7 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Example contributed by @seanpringle and reviewed by Max (@moliad) and Ramon Santamaria (@raysan5)
+*
+*   Copyright (c) 2020-2021 @seanpringle, Max (@moliad) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+
+#include "raylib.h"
+#include "raymath.h"
+
+#define RLIGHTS_IMPLEMENTATION
+#include "rlights.h"
+
+#include <stdlib.h>
+#include <math.h>
+
+#if defined(PLATFORM_DESKTOP)
+    #define GLSL_VERSION            330
+#else   // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
+    #define GLSL_VERSION            100
+#endif
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+    const int fps = 60;
+
+    SetConfigFlags(FLAG_MSAA_4X_HINT);  // Enable Multi Sampling Anti Aliasing 4x (if available)
+    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - mesh instancing");
+
+    int speed = 30;                 // Speed of jump animation
+    int groups = 2;                 // Count of separate groups jumping around
+    float amp = 10;                 // Maximum amplitude of jump
+    float variance = 0.8f;          // Global variance in jump height
+    float loop = 0.0f;              // Individual cube's computed loop timer
+    float x = 0.0f, y = 0.0f, z = 0.0f; // Used for various 3D coordinate & vector ops
+
+    // Define the camera to look into our 3d world
+    Camera camera = { 0 };
+    camera.position = (Vector3){ -125.0f, 125.0f, -125.0f };
+    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };
+    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
+    camera.fovy = 45.0f;
+    camera.projection = CAMERA_PERSPECTIVE;
+
+    const int instances = 10000;                                // Number of instances to display 
+    Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
+
+    Matrix *rotations = RL_MALLOC(instances*sizeof(Matrix));    // Rotation state of instances
+    Matrix *rotationsInc = RL_MALLOC(instances*sizeof(Matrix)); // Per-frame rotation animation of instances
+    Matrix *translations = RL_MALLOC(instances*sizeof(Matrix)); // Locations of instances
+
+    // Scatter random cubes around
+    for (int i = 0; i < instances; i++)
+    {
+        x = GetRandomValue(-50, 50);
+        y = GetRandomValue(-50, 50);
+        z = GetRandomValue(-50, 50);
+        translations[i] = MatrixTranslate(x, y, z); 
+
+        x = GetRandomValue(0, 360);
+        y = GetRandomValue(0, 360);
+        z = GetRandomValue(0, 360);
+        Vector3 axis = Vector3Normalize((Vector3){ x, y, z });
+        float angle = (float)GetRandomValue(0, 10)*DEG2RAD;
+
+        rotationsInc[i] = MatrixRotate(axis, angle);
+        rotations[i] = MatrixIdentity();
+    }
+
+    Matrix *transforms = RL_MALLOC(instances*sizeof(Matrix));   // Pre-multiplied transformations passed to rlgl
+
+    Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/base_lighting_instanced.vs", GLSL_VERSION), 
+                               TextFormat("resources/shaders/glsl%i/lighting.fs", GLSL_VERSION));
+
+    // Get some shader loactions
+    shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
+    shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
+    shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instance");
+
+    // Ambient light level
+    int ambientLoc = GetShaderLocation(shader, "ambient");
+    SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);
+
+    CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 50.0f, 50.0f, 0.0f }, Vector3Zero(), WHITE, shader);
+
+    // NOTE: We are assigning the intancing shader to material.shader
+    // to be used on mesh drawing with DrawMeshInstanced()
+    Material material = LoadMaterialDefault();
+    material.shader = shader;
+    material.maps[MATERIAL_MAP_DIFFUSE].color = RED;
+    
+    SetCameraMode(camera, CAMERA_ORBITAL);  // Set an orbital camera mode
+
+    int textPositionY = 300;
+    int framesCounter = 0;                  // Simple frames counter to manage animation
+
+    SetTargetFPS(fps);                      // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())            // Detect window close button or ESC key
+    {
+
+        // Update
+        //----------------------------------------------------------------------------------
+        textPositionY = 300;
+        framesCounter++;
+
+        if (IsKeyDown(KEY_UP)) amp += 0.5f;
+        if (IsKeyDown(KEY_DOWN)) amp = (amp <= 1)? 1.0f : (amp - 1.0f);
+        if (IsKeyDown(KEY_LEFT))  variance = (variance <= 0.0f)? 0.0f : (variance - 0.01f);
+        if (IsKeyDown(KEY_RIGHT)) variance = (variance >= 1.0f)? 1.0f : (variance + 0.01f);
+        if (IsKeyDown(KEY_ONE)) groups = 1;
+        if (IsKeyDown(KEY_TWO)) groups = 2;
+        if (IsKeyDown(KEY_THREE)) groups = 3;
+        if (IsKeyDown(KEY_FOUR)) groups = 4;
+        if (IsKeyDown(KEY_FIVE)) groups = 5;
+        if (IsKeyDown(KEY_SIX)) groups = 6;
+        if (IsKeyDown(KEY_SEVEN)) groups = 7;
+        if (IsKeyDown(KEY_EIGHT)) groups = 8;
+        if (IsKeyDown(KEY_NINE)) groups = 9;
+        if (IsKeyDown(KEY_W)) { groups = 7; amp = 25; speed = 18; variance = 0.70f; }
+            
+        if (IsKeyDown(KEY_EQUAL)) speed = (speed <= (fps*0.25f))? (fps*0.25f) : (speed*0.95f);
+        if (IsKeyDown(KEY_KP_ADD)) speed = (speed <= (fps*0.25f))? (fps*0.25f) : (speed*0.95f);
+            
+        if (IsKeyDown(KEY_MINUS)) speed = fmaxf(speed*1.02f, speed + 1);
+        if (IsKeyDown(KEY_KP_SUBTRACT)) speed = fmaxf(speed*1.02f, speed + 1);
+
+        // 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[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
+
+        // Apply per-instance transformations
+        for (int i = 0; i < instances; i++)
+        {
+            rotations[i] = MatrixMultiply(rotations[i], rotationsInc[i]);
+            transforms[i] = MatrixMultiply(rotations[i], translations[i]);
+            
+            // Get the animation cycle's framesCounter for this instance
+            loop = (float)((framesCounter + (int)(((float)(i%groups)/groups)*speed))%speed)/speed;
+            
+            // Calculate the y according to loop cycle
+            y = (sinf(loop*PI*2))*amp*((1 - variance) + (variance*(float)(i%(groups*10))/(groups*10)));
+            
+            // Clamp to floor
+            y = (y < 0)? 0.0f : y;
+            
+            transforms[i] = MatrixMultiply(transforms[i], MatrixTranslate(0.0f, y, 0.0f));
+        }
+        
+        UpdateCamera(&camera);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            BeginMode3D(camera);
+                DrawMeshInstanced(cube, material, transforms, instances);
+            EndMode3D();
+
+            DrawText("A CUBE OF DANCING CUBES!", 490, 10, 20, MAROON);
+            DrawText("PRESS KEYS:", 10, textPositionY, 20, BLACK);
+            
+            DrawText("1 - 9", 10, textPositionY += 25, 10, BLACK);  
+            DrawText(": Number of groups", 50, textPositionY , 10, BLACK);
+            DrawText(TextFormat(": %d", groups), 160, textPositionY , 10, BLACK);
+            
+            DrawText("UP", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": increase amplitude", 50, textPositionY, 10, BLACK);
+            DrawText(TextFormat(": %.2f", amp), 160, textPositionY , 10, BLACK);
+            
+            DrawText("DOWN", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": decrease amplitude", 50, textPositionY, 10, BLACK);
+            
+            DrawText("LEFT", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": decrease variance", 50, textPositionY, 10, BLACK);
+            DrawText(TextFormat(": %.2f", variance), 160, textPositionY , 10, BLACK);
+            
+            DrawText("RIGHT", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": increase variance", 50, textPositionY, 10, BLACK);
+            
+            DrawText("+/=", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": increase speed", 50, textPositionY, 10, BLACK);
+            DrawText(TextFormat(": %d = %f loops/sec", speed, ((float)fps / speed)), 160, textPositionY , 10, BLACK);
+            
+            DrawText("-", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": decrease speed", 50, textPositionY, 10, BLACK);
+            
+            DrawText("W", 10, textPositionY += 15, 10, BLACK);  
+            DrawText(": Wild setup!", 50, textPositionY, 10, BLACK);
+            
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}