Add a bloom example

Author: Jaedan

CMakeLists.txt

@@ -28,6 +28,7 @@ add_executable(SDL_gpu_examples
     Examples/TriangleMSAA.c
     Examples/Cubemap.c
     Examples/WindowResize.c
+    Examples/Bloom.c
 )
 
 target_include_directories(SDL_gpu_examples PRIVATE . spirv)

Content/Shaders/Compiled/Bloom.vert.spv

@@ -0,0 +1,11 @@
+#version 450
+
+layout (location = 0) in vec3 Position;
+layout (location = 1) in vec2 TexCoord;
+layout (location = 0) out vec2 outTexCoord;
+
+void main()
+{
+	outTexCoord = TexCoord;
+	gl_Position = vec4(Position, 1);
+}

Content/Shaders/Compiled/BloomBlend.frag.spv

@@ -0,0 +1,19 @@
+#version 450
+
+layout (location = 0) in vec2 TexCoord;
+layout (location = 0) out vec4 FragColor;
+layout (set = 2, binding = 0) uniform sampler2D Scene;
+layout (set = 2, binding = 1) uniform sampler2D Blur;
+layout (set = 3, binding = 0) uniform UniformBlock
+{
+    float Exposure;
+};
+
+void main()
+{
+    vec3 color = texture(Scene, TexCoord).rgb;
+    vec3 blurColor = texture(Blur, TexCoord).rgb;
+    color += blurColor;
+
+    FragColor = vec4(color, 1.0);
+}

Content/Shaders/Compiled/BloomExtract.frag.spv

@@ -0,0 +1,14 @@
+#version 450
+
+layout (location = 0) in vec2 TexCoord;
+layout (location = 0) out vec4 FragColor;
+layout (set = 2, binding = 0) uniform sampler2D Sampler;
+
+void main()
+{
+	FragColor = texture(Sampler, TexCoord);
+
+	float brightness = dot(FragColor.rgb, vec3(0.2126, 0.7152, 0.0722));
+	if (brightness < 1.0)
+		FragColor = vec4(0.0, 0.0, 0.0, 0.0);
+}

Content/Shaders/Compiled/GaussianBlur.frag.spv

@@ -0,0 +1,29 @@
+#version 450
+
+layout (location = 0) in vec2 TexCoord;
+layout (location = 0) out vec4 FragColor;
+layout (set = 2, binding = 0) uniform sampler2D Sampler;
+layout (set = 3, binding = 0) uniform UniformBlock
+{
+    bool Horizontal;
+};
+
+float Weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
+
+void main()
+{
+    vec2 tex_offset = 1.0 / textureSize(Sampler, 0); // gets size of single texel
+    vec3 result = texture(Sampler, TexCoord).rgb * Weight[0]; // current fragment's contribution
+    if (Horizontal) {
+        for (int i = 1; i < 5; ++i) {
+            result += texture(Sampler, TexCoord + vec2(tex_offset.x * i, 0.0)).rgb * Weight[i];
+            result += texture(Sampler, TexCoord - vec2(tex_offset.x * i, 0.0)).rgb * Weight[i];
+        }
+    } else {
+        for (int i = 1; i < 5; ++i) {
+            result += texture(Sampler, TexCoord + vec2(0.0, tex_offset.y * i)).rgb * Weight[i];
+            result += texture(Sampler, TexCoord - vec2(0.0, tex_offset.y * i)).rgb * Weight[i];
+        }
+    }
+    FragColor = vec4(result, 1.0);
+}