Pass depth range to depth map visualization shader

Fixes #895

data/shaders/glsl/shadowmapping/quad.frag

@@ -6,10 +6,21 @@ layout (location = 0) in vec2 inUV;
 
 layout (location = 0) out vec4 outFragColor;
 
+layout (binding = 0) uniform UBO 
+{
+	mat4 projection;
+	mat4 view;
+	mat4 model;
+	mat4 lightSpace;
+	vec4 lightPos;
+	float zNear;
+	float zFar;
+} ubo;
+
 float LinearizeDepth(float depth)
 {
-  float n = 1.0; // camera z near
-  float f = 128.0; // camera z far
+  float n = ubo.zNear;
+  float f = ubo.zFar;
   float z = depth;
   return (2.0 * n) / (f + n - z * (f - n));	
 }

data/shaders/glsl/shadowmapping/scene.vert

@@ -11,7 +11,9 @@ layout (binding = 0) uniform UBO
 	mat4 view;
 	mat4 model;
 	mat4 lightSpace;
-	vec3 lightPos;
+	vec4 lightPos;
+	float zNear;
+	float zFar;
 } ubo;
 
 layout (location = 0) out vec3 outNormal;
@@ -20,11 +22,6 @@ layout (location = 2) out vec3 outViewVec;
 layout (location = 3) out vec3 outLightVec;
 layout (location = 4) out vec4 outShadowCoord;
 
-out gl_PerVertex 
-{
-    vec4 gl_Position;   
-};
-
 const mat4 biasMat = mat4( 
 	0.5, 0.0, 0.0, 0.0,
 	0.0, 0.5, 0.0, 0.0,
@@ -40,7 +37,7 @@ void main()
 	
     vec4 pos = ubo.model * vec4(inPos, 1.0);
     outNormal = mat3(ubo.model) * inNormal;
-    outLightVec = normalize(ubo.lightPos - inPos);
+    outLightVec = normalize(ubo.lightPos.xyz - inPos);
     outViewVec = -pos.xyz;			
 
 	outShadowCoord = ( biasMat * ubo.lightSpace * ubo.model ) * vec4(inPos, 1.0);	

data/shaders/hlsl/shadowmapping/quad.frag

@@ -3,10 +3,23 @@
 Texture2D textureColor : register(t1);
 SamplerState samplerColor : register(s1);
 
+struct UBO
+{
+	float4x4 projection;
+	float4x4 view;
+	float4x4 model;
+	float4x4 lightSpace;
+	float4 lightPos;
+	float zNear;
+	float zFar;
+};
+
+cbuffer ubo : register(b0) { UBO ubo; }
+
 float LinearizeDepth(float depth)
 {
-  float n = 1.0; // camera z near
-  float f = 128.0; // camera z far
+  float n = ubo.zNear;
+  float f = ubo.zFar;
   float z = depth;
   return (2.0 * n) / (f + n - z * (f - n));
 }

data/shaders/hlsl/shadowmapping/scene.vert

@@ -14,7 +14,9 @@ struct UBO
 	float4x4 view;
 	float4x4 model;
 	float4x4 lightSpace;
-	float3 lightPos;
+	float4 lightPos;
+	float zNear;
+	float zFar;
 };
 
 cbuffer ubo : register(b0) { UBO ubo; }
@@ -45,7 +47,7 @@ VSOutput main(VSInput input)
 
     float4 pos = mul(ubo.model, float4(input.Pos, 1.0));
     output.Normal = mul((float3x3)ubo.model, input.Normal);
-    output.LightVec = normalize(ubo.lightPos - input.Pos);
+    output.LightVec = normalize(ubo.lightPos.xyz - input.Pos);
     output.ViewVec = -pos.xyz;
 
 	output.ShadowCoord = mul(biasMat, mul(ubo.lightSpace, mul(ubo.model, float4(input.Pos, 1.0))));

examples/shadowmapping/shadowmapping.cpp

@@ -56,7 +56,10 @@ public:
 		glm::mat4 view;
 		glm::mat4 model;
 		glm::mat4 depthBiasMVP;
-		glm::vec3 lightPos;
+		glm::vec4 lightPos;
+		// Used for depth map visualization
+		float zNear;
+		float zFar;
 	} uboVSscene;
 
 	struct {
@@ -384,7 +387,7 @@ public:
 		// Shared pipeline layout for all pipelines used in this sample
 		std::vector<VkDescriptorSetLayoutBinding> setLayoutBindings = {
 			// Binding 0 : Vertex shader uniform buffer
-			vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT, 0),
+			vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, VK_SHADER_STAGE_VERTEX_BIT | VK_SHADER_STAGE_FRAGMENT_BIT, 0),
 			// Binding 1 : Fragment shader image sampler (shadow map)
 			vks::initializers::descriptorSetLayoutBinding(VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, VK_SHADER_STAGE_FRAGMENT_BIT, 1)
 		};
@@ -409,6 +412,8 @@ public:
 		VkDescriptorSetAllocateInfo allocInfo = vks::initializers::descriptorSetAllocateInfo(descriptorPool, &descriptorSetLayout, 1);
 		VK_CHECK_RESULT(vkAllocateDescriptorSets(device, &allocInfo, &descriptorSets.debug));
 		writeDescriptorSets = {
+			// Binding 0 : Parameters uniform buffer
+			vks::initializers::writeDescriptorSet(descriptorSets.debug, VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, 0, &uniformBuffers.scene.descriptor),
 			// Binding 1 : Fragment shader texture sampler
 		    vks::initializers::writeDescriptorSet(descriptorSets.debug, VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, 1, &shadowMapDescriptor)
 		};
@@ -542,8 +547,10 @@ public:
 		uboVSscene.projection = camera.matrices.perspective;
 		uboVSscene.view = camera.matrices.view;
 		uboVSscene.model = glm::mat4(1.0f);
-		uboVSscene.lightPos = lightPos;
+		uboVSscene.lightPos = glm::vec4(lightPos, 1.0f);
 		uboVSscene.depthBiasMVP = uboOffscreenVS.depthMVP;
+		uboVSscene.zNear = zNear;
+		uboVSscene.zFar = zFar;
 		memcpy(uniformBuffers.scene.mapped, &uboVSscene, sizeof(uboVSscene));
 	}