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+/*******************************************************************************************
+*
+* raylib [shaders] example - Shadowmap
+*
+* Example originally created with raylib 5.0, last time updated with raylib 5.0
+*
+* Example contributed by @TheManTheMythTheGameDev and reviewed by Ramon Santamaria (@raysan5)
+*
+* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+* BSD-like license that allows static linking with closed source software
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+#include "rlgl.h"
+
+#if defined(PLATFORM_DESKTOP)
+#define GLSL_VERSION 330
+#else // PLATFORM_ANDROID, PLATFORM_WEB
+#define GLSL_VERSION 120
+#endif
+
+#define SHADOWMAP_RESOLUTION 1024
+
+RenderTexture2D LoadShadowmapRenderTexture(int width, int height);
+void UnloadShadowmapRenderTexture(RenderTexture2D target);
+void DrawScene(Model cube, Model robot);
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+ // Initialization
+ //--------------------------------------------------------------------------------------
+ const int screenWidth = 800;
+ const int screenHeight = 450;
+
+ SetConfigFlags(FLAG_MSAA_4X_HINT);
+ // Shadows are a HUGE topic, and this example shows an extremely simple implementation of the shadowmapping algorithm,
+ // which is the industry standard for shadows. This algorithm can be extended in a ridiculous number of ways to improve
+ // realism and also adapt it for different scenes. This is pretty much the simplest possible implementation.
+ InitWindow(screenWidth, screenHeight, "raylib [shaders] example - shadowmap");
+
+ Camera3D cam = (Camera3D){ 0 };
+ cam.position = (Vector3){ 10.0f, 10.0f, 10.0f };
+ cam.target = Vector3Zero();
+ cam.projection = CAMERA_PERSPECTIVE;
+ cam.up = (Vector3){ 0.0f, 1.0f, 0.0f };
+ cam.fovy = 45.0f;
+
+ Shader shadowShader = LoadShader(TextFormat("resources/shaders/glsl%i/shadowmap.vs", GLSL_VERSION),
+ TextFormat("resources/shaders/glsl%i/shadowmap.fs", GLSL_VERSION));
+ shadowShader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shadowShader, "viewPos");
+ Vector3 lightDir = Vector3Normalize((Vector3){ 0.35f, -1.0f, -0.35f });
+ Color lightColor = WHITE;
+ Vector4 lightColorNormalized = ColorNormalize(lightColor);
+ int lightDirLoc = GetShaderLocation(shadowShader, "lightDir");
+ int lightColLoc = GetShaderLocation(shadowShader, "lightColor");
+ SetShaderValue(shadowShader, lightDirLoc, &lightDir, SHADER_UNIFORM_VEC3);
+ SetShaderValue(shadowShader, lightColLoc, &lightColorNormalized, SHADER_UNIFORM_VEC4);
+ int ambientLoc = GetShaderLocation(shadowShader, "ambient");
+ float ambient[4] = {0.1f, 0.1f, 0.1f, 1.0f};
+ SetShaderValue(shadowShader, ambientLoc, ambient, SHADER_UNIFORM_VEC4);
+ int lightVPLoc = GetShaderLocation(shadowShader, "lightVP");
+ int shadowMapLoc = GetShaderLocation(shadowShader, "shadowMap");
+ int shadowMapResolution = SHADOWMAP_RESOLUTION;
+ SetShaderValue(shadowShader, GetShaderLocation(shadowShader, "shadowMapResolution"), &shadowMapResolution, SHADER_UNIFORM_INT);
+
+ Model cube = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
+ cube.materials[0].shader = shadowShader;
+ Model robot = LoadModel("resources/models/robot.glb");
+ for (int i = 0; i < robot.materialCount; i++)
+ {
+ robot.materials[i].shader = shadowShader;
+ }
+ int animCount = 0;
+ ModelAnimation* robotAnimations = LoadModelAnimations("resources/models/robot.glb", &animCount);
+
+ RenderTexture2D shadowMap = LoadShadowmapRenderTexture(SHADOWMAP_RESOLUTION, SHADOWMAP_RESOLUTION);
+ // For the shadowmapping algorithm, we will be rendering everything from the light's point of view
+ Camera3D lightCam = (Camera3D){ 0 };
+ lightCam.position = Vector3Scale(lightDir, -15.0f);
+ lightCam.target = Vector3Zero();
+ // Use an orthographic projection for directional lights
+ lightCam.projection = CAMERA_ORTHOGRAPHIC;
+ lightCam.up = (Vector3){ 0.0f, 1.0f, 0.0f };
+ lightCam.fovy = 20.0f;
+
+ SetTargetFPS(60);
+ //--------------------------------------------------------------------------------------
+ int fc = 0;
+
+ // Main game loop
+ while (!WindowShouldClose()) // Detect window close button or ESC key
+ {
+ // Update
+ //----------------------------------------------------------------------------------
+ float dt = GetFrameTime();
+
+ Vector3 cameraPos = cam.position;
+ SetShaderValue(shadowShader, shadowShader.locs[SHADER_LOC_VECTOR_VIEW], &cameraPos, SHADER_UNIFORM_VEC3);
+ UpdateCamera(&cam, CAMERA_ORBITAL);
+
+ fc++;
+ fc %= (robotAnimations[0].frameCount);
+ UpdateModelAnimation(robot, robotAnimations[0], fc);
+
+ const float cameraSpeed = 0.05f;
+ if (IsKeyDown(KEY_LEFT))
+ {
+ if (lightDir.x < 0.6f)
+ lightDir.x += cameraSpeed * 60.0f * dt;
+ }
+ if (IsKeyDown(KEY_RIGHT))
+ {
+ if (lightDir.x > -0.6f)
+ lightDir.x -= cameraSpeed * 60.0f * dt;
+ }
+ if (IsKeyDown(KEY_UP))
+ {
+ if (lightDir.z < 0.6f)
+ lightDir.z += cameraSpeed * 60.0f * dt;
+ }
+ if (IsKeyDown(KEY_DOWN))
+ {
+ if (lightDir.z > -0.6f)
+ lightDir.z -= cameraSpeed * 60.0f * dt;
+ }
+ lightDir = Vector3Normalize(lightDir);
+ lightCam.position = Vector3Scale(lightDir, -15.0f);
+ SetShaderValue(shadowShader, lightDirLoc, &lightDir, SHADER_UNIFORM_VEC3);
+
+ // Draw
+ //----------------------------------------------------------------------------------
+ BeginDrawing();
+
+ // First, render all objects into the shadowmap
+ // The idea is, we record all the objects' depths (as rendered from the light source's point of view) in a buffer
+ // Anything that is "visible" to the light is in light, anything that isn't is in shadow
+ // We can later use the depth buffer when rendering everything from the player's point of view
+ // to determine whether a given point is "visible" to the light
+
+ // Record the light matrices for future use!
+ Matrix lightView;
+ Matrix lightProj;
+ BeginTextureMode(shadowMap);
+ ClearBackground(WHITE);
+ BeginMode3D(lightCam);
+ lightView = rlGetMatrixModelview();
+ lightProj = rlGetMatrixProjection();
+ DrawScene(cube, robot);
+ EndMode3D();
+ EndTextureMode();
+ Matrix lightViewProj = MatrixMultiply(lightView, lightProj);
+
+ ClearBackground(RAYWHITE);
+
+ SetShaderValueMatrix(shadowShader, lightVPLoc, lightViewProj);
+
+ rlEnableShader(shadowShader.id);
+ int slot = 10; // Can be anything 0 to 15, but 0 will probably be taken up
+ rlActiveTextureSlot(10);
+ rlEnableTexture(shadowMap.depth.id);
+ rlSetUniform(shadowMapLoc, &slot, SHADER_UNIFORM_INT, 1);
+
+ BeginMode3D(cam);
+
+ // Draw the same exact things as we drew in the shadowmap!
+ DrawScene(cube, robot);
+
+ EndMode3D();
+
+ DrawText("Shadows in raylib using the shadowmapping algorithm!", screenWidth - 320, screenHeight - 20, 10, GRAY);
+ DrawText("Use the arrow keys to rotate the light!", 10, 10, 30, RED);
+
+ EndDrawing();
+
+ if (IsKeyPressed(KEY_F))
+ {
+ TakeScreenshot("shaders_shadowmap.png");
+ }
+ //----------------------------------------------------------------------------------
+ }
+
+ // De-Initialization
+ //--------------------------------------------------------------------------------------
+
+ UnloadShader(shadowShader);
+ UnloadModel(cube);
+ UnloadModel(robot);
+ UnloadModelAnimations(robotAnimations, animCount);
+ UnloadShadowmapRenderTexture(shadowMap);
+
+ CloseWindow(); // Close window and OpenGL context
+ //--------------------------------------------------------------------------------------
+
+ return 0;
+}
+
+RenderTexture2D LoadShadowmapRenderTexture(int width, int height)
+{
+ RenderTexture2D target = { 0 };
+
+ target.id = rlLoadFramebuffer(); // Load an empty framebuffer
+ target.texture.width = width;
+ target.texture.height = height;
+
+ if (target.id > 0)
+ {
+ rlEnableFramebuffer(target.id);
+
+ // Create depth texture
+ // We don't need a color texture for the shadowmap
+ target.depth.id = rlLoadTextureDepth(width, height, false);
+ target.depth.width = width;
+ target.depth.height = height;
+ target.depth.format = 19; //DEPTH_COMPONENT_24BIT?
+ target.depth.mipmaps = 1;
+
+ // Attach depth texture to FBO
+ rlFramebufferAttach(target.id, target.depth.id, RL_ATTACHMENT_DEPTH, RL_ATTACHMENT_TEXTURE2D, 0);
+
+ // Check if fbo is complete with attachments (valid)
+ if (rlFramebufferComplete(target.id)) TRACELOG(LOG_INFO, "FBO: [ID %i] Framebuffer object created successfully", target.id);
+
+ rlDisableFramebuffer();
+ }
+ else TRACELOG(LOG_WARNING, "FBO: Framebuffer object can not be created");
+
+ return target;
+}
+
+// Unload shadowmap render texture from GPU memory (VRAM)
+void UnloadShadowmapRenderTexture(RenderTexture2D target)
+{
+ if (target.id > 0)
+ {
+ // NOTE: Depth texture/renderbuffer is automatically
+ // queried and deleted before deleting framebuffer
+ rlUnloadFramebuffer(target.id);
+ }
+}
+
+void DrawScene(Model cube, Model robot)
+{
+ DrawModelEx(cube, Vector3Zero(), (Vector3) { 0.0f, 1.0f, 0.0f }, 0.0f, (Vector3) { 10.0f, 1.0f, 10.0f }, BLUE);
+ DrawModelEx(cube, (Vector3) { 1.5f, 1.0f, -1.5f }, (Vector3) { 0.0f, 1.0f, 0.0f }, 0.0f, Vector3One(), WHITE);
+ 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);
+}