add directional light component and skylight component, add PCSS and hard shadow

Editor/assets/shaders/BloomBlend.glsl

@@ -0,0 +1,63 @@
+#type vertex
+#version 430
+
+layout(location = 0) in vec3 a_Position;
+layout(location = 1) in vec2 a_TexCoord;
+
+out vec2 v_TexCoord;
+
+void main()
+{
+    vec4 position = vec4(a_Position.xy, 0.0, 1.0);
+    v_TexCoord = a_TexCoord;
+    gl_Position = position;
+}
+
+#type fragment
+#version 430
+
+layout(location = 0) out vec4 o_Color;
+
+in vec2 v_TexCoord;
+
+uniform sampler2D u_SceneTexture;
+uniform sampler2D u_BloomTexture;
+
+uniform float u_Exposure;
+uniform bool u_EnableBloom;
+
+void main()
+{
+#if 1
+    const float gamma     = 2.2;
+    const float pureWhite = 1.0;
+
+    // Tonemapping
+    vec3 color = texture(u_SceneTexture, v_TexCoord).rgb;
+    if (u_EnableBloom)
+    {
+        vec3 bloomColor = texture(u_BloomTexture, v_TexCoord).rgb;
+        color += bloomColor;
+    }
+
+    // Reinhard tonemapping
+    float luminance = dot(color, vec3(0.2126, 0.7152, 0.0722));
+    float mappedLuminance = (luminance * (1.0 + luminance / (pureWhite * pureWhite))) / (1.0 + luminance);
+
+    // Scale color by ratio of average luminances.
+    vec3 mappedColor = (mappedLuminance / luminance) * color* u_Exposure;
+
+    // Gamma correction.
+    o_Color = vec4(color, 1.0);
+#else
+    const float gamma = 2.2;
+    vec3 hdrColor = texture(u_SceneTexture, v_TexCoord).rgb;
+    vec3 bloomColor = texture(u_BloomTexture, v_TexCoord).rgb;
+    hdrColor += bloomColor; // additive blending
+    // tone mapping
+    vec3 result = vec3(1.0) - exp(-hdrColor * u_Exposure);
+    // also gamma correct while we're at it
+    result = pow(result, vec3(1.0 / gamma));
+    o_Color = vec4(result, 1.0);
+#endif
+}