simple cascade shadows test

res/shaders/entity.glslf

@@ -1,3 +1,4 @@
+in float a_distance;
 in vec4 a_color;
 in vec2 a_texCoord;
 in vec3 a_position;
@@ -17,13 +18,9 @@ uniform vec3 u_fogColor;
 uniform float u_fogFactor;
 uniform float u_fogCurve;
 uniform bool u_alphaClip;
-
-uniform sampler2DShadow u_shadows;
 uniform vec3 u_sunDir;
-uniform int u_shadowsRes;
 
 uniform bool u_enableShadows;
-uniform mat4 u_shadowsMatrix;
 
 #include <shadows>
 

res/shaders/lib/shadows.glsl

@@ -1,17 +1,12 @@
 #ifndef SHADOWS_GLSL_
 #define SHADOWS_GLSL_
 
-float sample_shadow(vec3 uv, vec3 xy) {
-    float color = 0.0;
-    vec3 off1 = vec3(1.3846153846) * xy;
-    vec3 off2 = vec3(3.2307692308) * xy;
-    color += texture(u_shadows, uv) * 0.2270270270;
-    color += texture(u_shadows, uv + (off1 / u_shadowsRes)) * 0.3162162162;
-    color += texture(u_shadows, uv - (off1 / u_shadowsRes)) * 0.3162162162;
-    color += texture(u_shadows, uv + (off2 / u_shadowsRes)) * 0.0702702703;
-    color += texture(u_shadows, uv - (off2 / u_shadowsRes)) * 0.0702702703;
-    return color;
-}
+uniform sampler2DShadow u_shadows;
+uniform sampler2DShadow u_wideShadows;
+uniform int u_shadowsRes;
+uniform bool u_blurShadows;
+uniform mat4 u_shadowsMatrix;
+uniform mat4 u_wideShadowsMatrix;
 
 float calc_shadow() {
     float shadow = 1.0;
@@ -21,20 +16,32 @@ float calc_shadow() {
         projCoords = projCoords * 0.5 + 0.5;
         projCoords.z -= 0.0001;
 
+        vec4 wmpos = u_wideShadowsMatrix * vec4(a_modelpos.xyz + a_realnormal * 0.2, 1.0);
+        vec3 wprojCoords = wmpos.xyz / wmpos.w;
+        wprojCoords = wprojCoords * 0.5 + 0.5;
+        wprojCoords.z -= 0.0001;
+
         shadow = 0.0;
         
         if (dot(a_realnormal, u_sunDir) < 0.0) {
-            const vec3 offsets[4] = vec3[4](
-                vec3(0.5, 0.5, 0.0),
-                vec3(-0.5, 0.5, 0.0),
-                vec3(0.5, -0.5, 0.0),
-                vec3(-0.5, -0.5, 0.0)
-            );
-            for (int i = 0; i < 4; i++) {
-                shadow += texture(u_shadows, projCoords.xyz + offsets[i] / u_shadowsRes);
+            if (u_blurShadows) {
+                const vec3 offsets[4] = vec3[4](
+                    vec3(0.5, 0.5, 0.0),
+                    vec3(-0.5, 0.5, 0.0),
+                    vec3(0.5, -0.5, 0.0),
+                    vec3(-0.5, -0.5, 0.0)
+                );
+                for (int i = 0; i < 4; i++) {
+                    shadow += texture(u_shadows, projCoords.xyz + offsets[i] / u_shadowsRes);
+                }
+                shadow /= 4;
+            } else {
+                if (a_distance > 32.0) {
+                    shadow = texture(u_wideShadows, wprojCoords.xyz);
+                } else {
+                    shadow = texture(u_shadows, projCoords.xyz);
+                }
             }
-            shadow /= 4;
-            //shadow = sample_shadow(projCoords, normalize(vec3(1.0, 1.0, 0.0)) * 0.5);
             shadow = shadow * 0.5 + 0.5;
         } else {
             shadow = 0.5;

res/shaders/main.glslf

@@ -2,6 +2,7 @@ layout (location = 0) out vec4 f_color;
 layout (location = 1) out vec4 f_position;
 layout (location = 2) out vec4 f_normal;
 
+in float a_distance;
 in vec4 a_torchLight;
 in vec3 a_skyLight;
 in vec2 a_texCoord;
@@ -14,9 +15,7 @@ in vec4 a_modelpos;
 
 uniform sampler2D u_texture0;
 uniform samplerCube u_skybox;
-uniform sampler2DShadow u_shadows;
 uniform vec3 u_sunDir;
-uniform int u_shadowsRes;
 
 // flags
 uniform bool u_alphaClip;
@@ -24,8 +23,6 @@ uniform bool u_debugLights;
 uniform bool u_debugNormals;
 uniform bool u_enableShadows;
 
-uniform mat4 u_shadowsMatrix;
-
 #include <shadows>
 
 void main() {

src/graphics/render/WorldRenderer.cpp

@@ -132,11 +132,18 @@ void WorldRenderer::setupWorldShader(
 
     if (shadows) {
         shader.uniformMatrix("u_shadowsMatrix", shadowCamera.getProjView());
+        shader.uniformMatrix("u_wideShadowsMatrix", wideShadowCamera.getProjView());
         shader.uniform3f("u_sunDir", shadowCamera.front);
         shader.uniform1i("u_shadowsRes", shadowMap->getResolution());
+
         glActiveTexture(GL_TEXTURE4);
         shader.uniform1i("u_shadows", 4);
         glBindTexture(GL_TEXTURE_2D, shadowMap->getDepthMap());
+
+        glActiveTexture(GL_TEXTURE5);
+        shader.uniform1i("u_wideShadows", 5);
+        glBindTexture(GL_TEXTURE_2D, wideShadowMap->getDepthMap());
+
         glActiveTexture(GL_TEXTURE0);
     }
 
@@ -337,15 +344,21 @@ void WorldRenderer::renderHands(
     skybox->unbind();
 }
 
-void WorldRenderer::generateShadowsMap(const Camera& camera, const DrawContext& pctx) {
+void WorldRenderer::generateShadowsMap(
+    const Camera& camera,
+    const DrawContext& pctx,
+    ShadowMap& shadowMap,
+    Camera& shadowCamera,
+    float scale
+) {
     auto& shadowsShader = assets.require<Shader>("shadows");
 
     auto world = level.getWorld();
     const auto& worldInfo = world->getInfo();
 
     const auto& settings = engine.getSettings();
-    int resolution = shadowMap->getResolution();
-    float shadowMapScale = 0.1f / (1 << glm::max(0L, settings.graphics.shadowsQuality.get()));
+    int resolution = shadowMap.getResolution();
+    float shadowMapScale = 0.1f / (1 << glm::max(0L, settings.graphics.shadowsQuality.get())) * scale;
     float shadowMapSize = resolution * shadowMapScale;
 
     glm::vec3 basePos = glm::floor(camera.position / 500.0f) * 500.0f;
@@ -386,10 +399,10 @@ void WorldRenderer::generateShadowsMap(const Camera& camera, const DrawContext&
         sctx.setDepthTest(true);
         sctx.setCullFace(true);
         sctx.setViewport({resolution, resolution});
-        shadowMap->bind();
+        shadowMap.bind();
         setupWorldShader(shadowsShader, shadowCamera, settings, 0.0f);
         chunks->drawChunksShadowsPass(shadowCamera, shadowsShader);
-        shadowMap->unbind();
+        shadowMap.unbind();
     }
 }
 
@@ -413,16 +426,19 @@ void WorldRenderer::draw(
     const auto& settings = engine.getSettings();
     gbufferPipeline = settings.graphics.advancedRender.get();
     int shadowsQuality = settings.graphics.shadowsQuality.get();
-    int resolution = 1024 << shadowsQuality;
+    int resolution = 512 << shadowsQuality;
     if (shadowsQuality > 0 && !shadows) {
         shadowMap = std::make_unique<ShadowMap>(resolution);
+        wideShadowMap = std::make_unique<ShadowMap>(resolution);
         shadows = true;
     } else if (shadowsQuality == 0) {
         shadowMap.reset();
+        wideShadowMap.reset();
         shadows = false;
     }
     if (shadows && shadowMap->getResolution() != resolution) {
         shadowMap = std::make_unique<ShadowMap>(resolution);
+        wideShadowMap = std::make_unique<ShadowMap>(resolution);
     }
 
     const auto& worldInfo = world->getInfo();
@@ -438,8 +454,12 @@ void WorldRenderer::draw(
     chunks->update();
 
     static int frameid = 0;
-    if (shadows && frameid % 2 == 0) {
-        generateShadowsMap(camera, pctx);
+    if (shadows) {
+        if (frameid % 2 == 0) {
+            generateShadowsMap(camera, pctx, *shadowMap, shadowCamera, 1.0f);
+        } else {
+            generateShadowsMap(camera, pctx, *wideShadowMap, wideShadowCamera, 8.0f);
+        }
     }
     frameid++;
 

src/graphics/render/WorldRenderer.hpp

@@ -48,8 +48,10 @@ class WorldRenderer {
     std::unique_ptr<ChunksRenderer> chunks;
     std::unique_ptr<Skybox> skybox;
     std::unique_ptr<ShadowMap> shadowMap;
+    std::unique_ptr<ShadowMap> wideShadowMap;
     Weather weather {};
     Camera shadowCamera;
+    Camera wideShadowCamera;
     
     float timer = 0.0f;
     bool debug = false;
@@ -78,7 +80,13 @@ class WorldRenderer {
         float fogFactor
     );
 
-    void generateShadowsMap(const Camera& camera, const DrawContext& pctx);
+    void generateShadowsMap(
+        const Camera& camera,
+        const DrawContext& pctx,
+        ShadowMap& shadowMap,
+        Camera& shadowCamera,
+        float scale
+    );
 public:
     std::unique_ptr<ParticlesRenderer> particles;
     std::unique_ptr<TextsRenderer> texts;