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256 lines
11 KiB
256 lines
11 KiB
/*******************************************************************************************
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*
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* raylib [shaders] example - shadowmap rendering
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*
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* Example complexity rating: [★★★★] 4/4
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*
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* Example originally created with raylib 5.0, last time updated with raylib 5.0
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*
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* Example contributed by TheManTheMythTheGameDev (@TheManTheMythTheGameDev) and reviewed by 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) 2023-2025 TheManTheMythTheGameDev (@TheManTheMythTheGameDev)
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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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#include "rlgl.h"
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#if defined(PLATFORM_DESKTOP)
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#define GLSL_VERSION 330
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#else // PLATFORM_ANDROID, PLATFORM_WEB
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#define GLSL_VERSION 100
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#endif
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#define SHADOWMAP_RESOLUTION 1024
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static RenderTexture2D LoadShadowmapRenderTexture(int width, int height);
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static void UnloadShadowmapRenderTexture(RenderTexture2D target);
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static void DrawScene(Model cube, Model robot);
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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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// Shadows are a HUGE topic, and this example shows an extremely simple implementation of the shadowmapping algorithm,
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// which is the industry standard for shadows. This algorithm can be extended in a ridiculous number of ways to improve
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// realism and also adapt it for different scenes. This is pretty much the simplest possible implementation
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SetConfigFlags(FLAG_MSAA_4X_HINT);
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - shadowmap rendering");
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Camera3D camera = (Camera3D){ 0 };
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camera.position = (Vector3){ 10.0f, 10.0f, 10.0f };
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camera.target = Vector3Zero();
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camera.projection = CAMERA_PERSPECTIVE;
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camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
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camera.fovy = 45.0f;
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Shader shadowShader = LoadShader(TextFormat("resources/shaders/glsl%i/shadowmap.vs", GLSL_VERSION),
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TextFormat("resources/shaders/glsl%i/shadowmap.fs", GLSL_VERSION));
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shadowShader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shadowShader, "viewPos");
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Vector3 lightDir = Vector3Normalize((Vector3){ 0.35f, -1.0f, -0.35f });
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Color lightColor = WHITE;
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Vector4 lightColorNormalized = ColorNormalize(lightColor);
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int lightDirLoc = GetShaderLocation(shadowShader, "lightDir");
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int lightColLoc = GetShaderLocation(shadowShader, "lightColor");
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SetShaderValue(shadowShader, lightDirLoc, &lightDir, SHADER_UNIFORM_VEC3);
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SetShaderValue(shadowShader, lightColLoc, &lightColorNormalized, SHADER_UNIFORM_VEC4);
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int ambientLoc = GetShaderLocation(shadowShader, "ambient");
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float ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
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SetShaderValue(shadowShader, ambientLoc, ambient, SHADER_UNIFORM_VEC4);
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int lightVPLoc = GetShaderLocation(shadowShader, "lightVP");
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int shadowMapLoc = GetShaderLocation(shadowShader, "shadowMap");
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int shadowMapResolution = SHADOWMAP_RESOLUTION;
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SetShaderValue(shadowShader, GetShaderLocation(shadowShader, "shadowMapResolution"), &shadowMapResolution, SHADER_UNIFORM_INT);
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Model cube = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
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cube.materials[0].shader = shadowShader;
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Model robot = LoadModel("resources/models/robot.glb");
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for (int i = 0; i < robot.materialCount; i++) robot.materials[i].shader = shadowShader;
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int animCount = 0;
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ModelAnimation *robotAnimations = LoadModelAnimations("resources/models/robot.glb", &animCount);
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RenderTexture2D shadowMap = LoadShadowmapRenderTexture(SHADOWMAP_RESOLUTION, SHADOWMAP_RESOLUTION);
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// For the shadowmapping algorithm, we will be rendering everything from the light's point of view
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Camera3D lightCamera = { 0 };
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lightCamera.position = Vector3Scale(lightDir, -15.0f);
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lightCamera.target = Vector3Zero();
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lightCamera.projection = CAMERA_ORTHOGRAPHIC; // Use an orthographic projection for directional lights
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lightCamera.up = (Vector3){ 0.0f, 1.0f, 0.0f };
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lightCamera.fovy = 20.0f;
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int frameCounter = 0;
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// Store the light matrices
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Matrix lightView = { 0 };
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Matrix lightProj = { 0 };
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Matrix lightViewProj = { 0 };
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int textureActiveSlot = 10; // Can be anything 0 to 15, but 0 will probably be taken up
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SetTargetFPS(60);
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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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float deltaTime = GetFrameTime();
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Vector3 cameraPos = camera.position;
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SetShaderValue(shadowShader, shadowShader.locs[SHADER_LOC_VECTOR_VIEW], &cameraPos, SHADER_UNIFORM_VEC3);
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UpdateCamera(&camera, CAMERA_ORBITAL);
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frameCounter++;
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frameCounter %= (robotAnimations[0].frameCount);
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UpdateModelAnimation(robot, robotAnimations[0], frameCounter);
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// Move light with arrow keys
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const float cameraSpeed = 0.05f;
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if (IsKeyDown(KEY_LEFT))
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{
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if (lightDir.x < 0.6f) lightDir.x += cameraSpeed*60.0f*deltaTime;
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}
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if (IsKeyDown(KEY_RIGHT))
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{
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if (lightDir.x > -0.6f) lightDir.x -= cameraSpeed*60.0f*deltaTime;
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}
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if (IsKeyDown(KEY_UP))
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{
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if (lightDir.z < 0.6f) lightDir.z += cameraSpeed*60.0f*deltaTime;
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}
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if (IsKeyDown(KEY_DOWN))
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{
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if (lightDir.z > -0.6f) lightDir.z -= cameraSpeed*60.0f*deltaTime;
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}
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lightDir = Vector3Normalize(lightDir);
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lightCamera.position = Vector3Scale(lightDir, -15.0f);
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SetShaderValue(shadowShader, lightDirLoc, &lightDir, SHADER_UNIFORM_VEC3);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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// PASS 01: Render all objects into the shadowmap render texture
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// We record all the objects' depths (as rendered from the light source's point of view) in a buffer
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// Anything that is "visible" to the light is in light, anything that isn't is in shadow
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// We can later use the depth buffer when rendering everything from the player's point of view
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// to determine whether a given point is "visible" to the light
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BeginTextureMode(shadowMap);
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ClearBackground(WHITE);
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BeginMode3D(lightCamera);
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lightView = rlGetMatrixModelview();
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lightProj = rlGetMatrixProjection();
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DrawScene(cube, robot);
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EndMode3D();
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EndTextureMode();
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lightViewProj = MatrixMultiply(lightView, lightProj);
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// PASS 02: Draw the scene into main framebuffer, using the generated shadowmap
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BeginDrawing();
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ClearBackground(RAYWHITE);
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SetShaderValueMatrix(shadowShader, lightVPLoc, lightViewProj);
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rlEnableShader(shadowShader.id);
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rlActiveTextureSlot(textureActiveSlot);
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rlEnableTexture(shadowMap.depth.id);
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rlSetUniform(shadowMapLoc, &textureActiveSlot, SHADER_UNIFORM_INT, 1);
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BeginMode3D(camera);
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DrawScene(cube, robot); // Draw the same exact things as we drew in the shadowmap!
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EndMode3D();
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DrawText("Use the arrow keys to rotate the light!", 10, 10, 30, RED);
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DrawText("Shadows in raylib using the shadowmapping algorithm!", screenWidth - 280, screenHeight - 20, 10, GRAY);
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EndDrawing();
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if (IsKeyPressed(KEY_F)) TakeScreenshot("shaders_shadowmap.png");
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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UnloadShader(shadowShader);
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UnloadModel(cube);
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UnloadModel(robot);
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UnloadModelAnimations(robotAnimations, animCount);
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UnloadShadowmapRenderTexture(shadowMap);
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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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// Load render texture for shadowmap projection
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// NOTE: Load framebuffer with only a texture depth attachment,
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// no color attachment required for shadowmap
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static RenderTexture2D LoadShadowmapRenderTexture(int width, int height)
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{
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RenderTexture2D target = { 0 };
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target.id = rlLoadFramebuffer(); // Load an empty framebuffer
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target.texture.width = width;
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target.texture.height = height;
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if (target.id > 0)
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{
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rlEnableFramebuffer(target.id);
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// Create depth texture
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// NOTE: No need a color texture attachment for the shadowmap
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target.depth.id = rlLoadTextureDepth(width, height, false);
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target.depth.width = width;
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target.depth.height = height;
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target.depth.format = 19; // DEPTH_COMPONENT_24BIT?
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target.depth.mipmaps = 1;
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// Attach depth texture to FBO
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rlFramebufferAttach(target.id, target.depth.id, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_TEXTURE2D, 0);
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// Check if fbo is complete with attachments (valid)
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if (rlFramebufferComplete(target.id)) TRACELOG(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", target.id);
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rlDisableFramebuffer();
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}
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else TRACELOG(LOG_WARNING, "FBO: Framebuffer object can not be created");
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return target;
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}
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// Unload shadowmap render texture from GPU memory (VRAM)
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static void UnloadShadowmapRenderTexture(RenderTexture2D target)
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{
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if (target.id > 0)
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{
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// NOTE: Depth texture/renderbuffer is automatically
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// queried and deleted before deleting framebuffer
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rlUnloadFramebuffer(target.id);
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}
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}
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// Draw full scene projecting shadows
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// NOTE: Required to be called several time to generate shadowmap
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static void DrawScene(Model cube, Model robot)
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{
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DrawModelEx(cube, Vector3Zero(), (Vector3) { 0.0f, 1.0f, 0.0f }, 0.0f, (Vector3) { 10.0f, 1.0f, 10.0f }, BLUE);
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DrawModelEx(cube, (Vector3) { 1.5f, 1.0f, -1.5f }, (Vector3) { 0.0f, 1.0f, 0.0f }, 0.0f, Vector3One(), WHITE);
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DrawModelEx(robot, (Vector3) { 0.0f, 0.5f, 0.0f }, (Vector3) { 0.0f, 1.0f, 0.0f }, 0.0f, (Vector3) { 1.0f, 1.0f, 1.0f }, RED);
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}
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