Stabilize shadows and soften foliage shadow casting

include/rendering/m2_renderer.hpp

@@ -158,6 +158,11 @@ public:
      */
     void render(const Camera& camera, const glm::mat4& view, const glm::mat4& projection);
 
+    /**
+     * Render depth-only pass for shadow casting
+     */
+    void renderShadow(GLuint shadowShaderProgram);
+
     /**
      * Render smoke particles (call after render())
      */

include/rendering/renderer.hpp

@@ -180,6 +180,8 @@ private:
     uint32_t shadowDepthTex = 0;
     uint32_t shadowShaderProgram = 0;
     glm::mat4 lightSpaceMatrix = glm::mat4(1.0f);
+    glm::vec3 shadowCenter = glm::vec3(0.0f);
+    bool shadowCenterInitialized = false;
 
     void initShadowMap();
     void renderShadowPass();