148 lines
6.5 KiB
C
148 lines
6.5 KiB
C
/*******************************************************************************************
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*
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* raylib [shaders] example - Mesh instancing
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*
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* Example originally created with raylib 3.7, last time updated with raylib 4.2
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*
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* Example contributed by @seanpringle and reviewed by Max (@moliad) and Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2020-2023 @seanpringle, Max (@moliad) and Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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#define RLIGHTS_IMPLEMENTATION
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#include "rlights.h"
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#include <stdlib.h> // Required for: calloc(), free()
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#if defined(PLATFORM_DESKTOP)
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#define GLSL_VERSION 330
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#else // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
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#define GLSL_VERSION 100
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#endif
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#define MAX_INSTANCES 10000
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - mesh instancing");
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// Define the camera to look into our 3d world
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Camera camera = { 0 };
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camera.position = (Vector3){ -125.0f, 125.0f, -125.0f }; // Camera position
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camera.target = (Vector3){ 0.0f, 0.0f, 0.0f }; // Camera looking at point
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camera.up = (Vector3){ 0.0f, 1.0f, 0.0f }; // Camera up vector (rotation towards target)
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camera.fovy = 45.0f; // Camera field-of-view Y
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camera.projection = CAMERA_PERSPECTIVE; // Camera projection type
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// Define mesh to be instanced
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Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
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// Define transforms to be uploaded to GPU for instances
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Matrix *transforms = (Matrix *)RL_CALLOC(MAX_INSTANCES, sizeof(Matrix)); // Pre-multiplied transformations passed to rlgl
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// Translate and rotate cubes randomly
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for (int i = 0; i < MAX_INSTANCES; i++)
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{
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Matrix translation = MatrixTranslate((float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50));
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Vector3 axis = Vector3Normalize((Vector3){ (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360) });
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float angle = (float)GetRandomValue(0, 10)*DEG2RAD;
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Matrix rotation = MatrixRotate(axis, angle);
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transforms[i] = MatrixMultiply(rotation, translation);
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}
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// Load lighting shader
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Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/lighting_instancing.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/lighting.fs", GLSL_VERSION));
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// Get shader locations
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shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
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shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
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shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instanceTransform");
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// Set shader value: ambient light level
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int ambientLoc = GetShaderLocation(shader, "ambient");
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SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);
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// Create one light
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CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 50.0f, 50.0f, 0.0f }, Vector3Zero(), WHITE, shader);
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// NOTE: We are assigning the intancing shader to material.shader
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// to be used on mesh drawing with DrawMeshInstanced()
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Material matInstances = LoadMaterialDefault();
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matInstances.shader = shader;
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matInstances.maps[MATERIAL_MAP_DIFFUSE].color = RED;
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// Load default material (using raylib intenral default shader) for non-instanced mesh drawing
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// WARNING: Default shader enables vertex color attribute BUT GenMeshCube() does not generate vertex colors, so,
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// when drawing the color attribute is disabled and a default color value is provided as input for thevertex attribute
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Material matDefault = LoadMaterialDefault();
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matDefault.maps[MATERIAL_MAP_DIFFUSE].color = BLUE;
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(&camera, CAMERA_ORBITAL);
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// Update the light shader with the camera view position
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float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
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SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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BeginMode3D(camera);
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// Draw cube mesh with default material (BLUE)
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DrawMesh(cube, matDefault, MatrixTranslate(-10.0f, 0.0f, 0.0f));
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// Draw meshes instanced using material containing instancing shader (RED + lighting),
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// transforms[] for the instances should be provided, they are dynamically
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// updated in GPU every frame, so we can animate the different mesh instances
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DrawMeshInstanced(cube, matInstances, transforms, MAX_INSTANCES);
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// Draw cube mesh with default material (BLUE)
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DrawMesh(cube, matDefault, MatrixTranslate(10.0f, 0.0f, 0.0f));
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EndMode3D();
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DrawFPS(10, 10);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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RL_FREE(transforms); // Free transforms
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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