Different scene, toon shading and separate parameters for color input attachment

android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.3'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }

data/shaders/inputattachments/attachmentread.frag

@@ -4,16 +4,30 @@ layout (input_attachment_index = 0, binding = 0) uniform subpassInput inputColor
 layout (input_attachment_index = 1, binding = 1) uniform subpassInput inputDepth;
 
 layout (binding = 2) uniform UBO {
+	vec2 brightnessContrast;
 	vec2 range;
 	int attachmentIndex;
 } ubo;
 
 layout (location = 0) out vec4 outColor;
 
+vec3 brightnessContrast(vec3 color, float brightness, float contrast) {
+	return (color - 0.5) * contrast + 0.5 + brightness;
+}
+
 void main() 
 {
-	// Read values from previous sub pass
-	vec3 col = ubo.attachmentIndex == 0 ? subpassLoad(inputColor).rgb : subpassLoad(inputDepth).rrr;
-
-	outColor.rgb = ((col - ubo.range[0]) * 1.0 / (ubo.range[1] - ubo.range[0]));
+	// Apply brightness and contrast filer to color input
+	if (ubo.attachmentIndex == 0) {
+		// Read color from previous color input attachment
+		vec3 color = subpassLoad(inputColor).rgb;
+		outColor.rgb = brightnessContrast(color, ubo.brightnessContrast[0], ubo.brightnessContrast[1]);
+	}
+
+	// Visualize depth input range
+	if (ubo.attachmentIndex == 1) {
+		// Read depth from previous depth input attachment
+		float depth = subpassLoad(inputDepth).r;
+		outColor.rgb = vec3((depth - ubo.range[0]) * 1.0 / (ubo.range[1] - ubo.range[0]));
+	}
 }

data/shaders/inputattachments/attachmentwrite.frag

@@ -1,11 +1,23 @@
 #version 450
 
 layout (location = 0) in vec3 inColor;
+layout (location = 1) in vec3 inNormal;
+layout (location = 2) in vec3 inViewVec;
+layout (location = 3) in vec3 inLightVec;
 
 layout (location = 0) out vec4 outColor;
 
 void main() 
 {
-	outColor = vec4(inColor, 0.0);
+	// Toon shading color attachment output
+	float intensity = dot(normalize(inNormal), normalize(inLightVec));
+	float shade = 1.0;
+	shade = intensity < 0.5 ? 0.75 : shade;
+	shade = intensity < 0.35 ? 0.6 : shade;
+	shade = intensity < 0.25 ? 0.5 : shade;
+	shade = intensity < 0.1 ? 0.25 : shade;
+
+	outColor.rgb = inColor * 3.0 * shade;
+
 	// Depth attachment does not need to be explicitly written
 }

data/shaders/inputattachments/attachmentwrite.vert

@@ -1,9 +1,6 @@
 #version 450
 
-#extension GL_ARB_separate_shader_objects : enable
-#extension GL_ARB_shading_language_420pack : enable
-
-layout (location = 0) in vec4 inPos;
+layout (location = 0) in vec3 inPos;
 layout (location = 1) in vec3 inColor;
 layout (location = 2) in vec3 inNormal;
 
@@ -14,6 +11,9 @@ layout (binding = 0) uniform UBO {
 } ubo;
 
 layout (location = 0) out vec3 outColor;
+layout (location = 1) out vec3 outNormal;
+layout (location = 2) out vec3 outViewVec;
+layout (location = 3) out vec3 outLightVec;
 
 out gl_PerVertex {
 	vec4 gl_Position;
@@ -21,6 +21,9 @@ out gl_PerVertex {
 
 void main() 
 {
-	gl_Position = ubo.projection * ubo.view * ubo.model * inPos;
+	gl_Position = ubo.projection * ubo.view * ubo.model * vec4(inPos, 1.0);
 	outColor = inColor;
+	outNormal = inNormal;
+	outLightVec = vec3(0.0f, 5.0f, 15.0f) - inPos;
+	outViewVec = -inPos.xyz;		
 }

examples/inputattachments/inputattachments.cpp

@@ -36,7 +36,6 @@ public:
 		vks::VERTEX_COMPONENT_POSITION,
 		vks::VERTEX_COMPONENT_COLOR,
 		vks::VERTEX_COMPONENT_NORMAL,
-		vks::VERTEX_COMPONENT_UV,
 	});
 
 	vks::Model scene;
@@ -48,6 +47,7 @@ public:
 	} uboMatrices;
 
 	struct UBOParams {
+		glm::vec2 brightnessContrast = glm::vec2(0.5f, 1.8f);
 		glm::vec2 range = glm::vec2(0.6f, 1.0f);
 		int32_t attachmentIndex = 1;
 	} uboParams;
@@ -68,7 +68,6 @@ public:
 	} pipelineLayouts;
 
 	struct {
-		VkDescriptorSet attachmentWrite;
 		VkDescriptorSet attachmentRead;
 	} descriptorSets;
 
@@ -93,12 +92,9 @@ public:
 	{
 		title = "Input attachments";
 		camera.type = Camera::CameraType::firstperson;
-		camera.movementSpeed = 5.0f;
-#ifndef __ANDROID__
-		camera.rotationSpeed = 0.25f;
-#endif  
-		camera.setPosition(glm::vec3(-3.2f, 1.0f, 5.9f));
-		camera.setRotation(glm::vec3(0.5f, 210.05f, 0.0f));
+		camera.movementSpeed = 2.5f;
+		camera.setPosition(glm::vec3(1.65f, 1.75f, -6.15f));
+		camera.setRotation(glm::vec3(-12.75f, 380.0f, 0.0f));
 		camera.setPerspective(60.0f, (float)width / (float)height, 0.1f, 256.0f);
 		settings.overlay = true;
 	}
@@ -219,6 +215,7 @@ public:
 		std::array<VkAttachmentDescription, 3> attachments{};
 
 		// Swap chain image color attachment
+		// Will be transitioned to present layout
 		attachments[0].format = swapChain.colorFormat;
 		attachments[0].samples = VK_SAMPLE_COUNT_1_BIT;
 		attachments[0].loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
@@ -229,6 +226,9 @@ public:
 		attachments[0].finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
 
 		// Input attachments
+		// These will be written in the first subpass, transitioned to input attachments 
+		// and then read in the secod subpass
+
 		// Color
 		attachments[1].format = this->attachments.color.format;
 		attachments[1].samples = VK_SAMPLE_COUNT_1_BIT;
@@ -380,7 +380,7 @@ public:
 
 			/*
 				Second sub pass
-				Reads from the attachments via input attachments
+				Render a full screen quad, reading from the previously written attachments via input attachments
 			*/
 			{
 				vks::debugmarker::beginRegion(drawCmdBuffers[i], "Subpass 1: Reading attachments", glm::vec4(1.0f, 1.0f, 1.0f, 1.0f));
@@ -402,7 +402,7 @@ public:
 
 	void loadAssets()
 	{
-		scene.loadFromFile(getAssetPath() + "models/samplebuilding.dae", vertexLayout, 1.0f, vulkanDevice, queue);
+		scene.loadFromFile(getAssetPath() + "models/treasure_smooth.dae", vertexLayout, 1.0f, vulkanDevice, queue);
 	}
 
 	void setupDescriptors()
@@ -521,7 +521,6 @@ public:
 			vks::initializers::vertexInputAttributeDescription(0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0),					// Location 0: Position	
 			vks::initializers::vertexInputAttributeDescription(0, 1, VK_FORMAT_R32G32B32_SFLOAT, sizeof(float) * 3),	// Location 1: Color
 			vks::initializers::vertexInputAttributeDescription(0, 2, VK_FORMAT_R32G32B32_SFLOAT, sizeof(float) * 6),	// Location 2: Normal
-			vks::initializers::vertexInputAttributeDescription(0, 3, VK_FORMAT_R32G32_SFLOAT, sizeof(float) * 9),		// Location 3: UV
 		};
 
 		VkPipelineVertexInputStateCreateInfo vertexInputStateCI = vks::initializers::pipelineVertexInputStateCreateInfo();
@@ -624,9 +623,22 @@ public:
 	virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay)
 	{
 		if (overlay->header("Settings")) {
-			if (overlay->comboBox("Attachment", &uboParams.attachmentIndex, { "color", "depth" })) {
+			overlay->text("Input attachment");
+			if (overlay->comboBox("##attachment", &uboParams.attachmentIndex, { "color", "depth" })) {
 				updateUniformBuffers();
 			}
+			switch (uboParams.attachmentIndex) {
+			case 0:
+				overlay->text("Brightness");
+				if (overlay->sliderFloat("##b", &uboParams.brightnessContrast[0], 0.0f, 2.0f)) {
+					updateUniformBuffers();
+				}
+				overlay->text("Contrast");
+				if (overlay->sliderFloat("##c", &uboParams.brightnessContrast[1], 0.0f, 4.0f)) {
+					updateUniformBuffers();
+				}
+				break;
+			case 1:
 				overlay->text("Visible range");
 				if (overlay->sliderFloat("min", &uboParams.range[0], 0.0f, uboParams.range[1])) {
 					updateUniformBuffers();
@@ -634,6 +646,8 @@ public:
 				if (overlay->sliderFloat("max", &uboParams.range[1], uboParams.range[0], 1.0f)) {
 					updateUniformBuffers();
 				}
+				break;
+			}
 		}
 	}
 };