Allow shader to define the depth compare operator

openVulkanoCpp/Scene/Prefabs/ArBackgroundDrawable.cpp

@@ -25,6 +25,7 @@ namespace OpenVulkano::Scene
 		m_shader.AddShaderProgram(ShaderProgramType::FRAGMENT, "Shader/background");
 		m_shader.AddDescriptorSetLayoutBinding(UniformBuffer::DESCRIPTOR_SET_LAYOUT_BINDING);
 		m_shader.AddDescriptorSetLayoutBinding(Texture::DESCRIPTOR_SET_LAYOUT_BINDING);
+		m_shader.depthCompareOp = CompareOp::LESS_OR_EQUAL;
 		SetShader(&m_shader);
 		m_intrinsicsBuffer.Init(sizeof(Math::CameraIntrinsicWithResolution), &FALLBACK_INTRINSICS);
 		m_intrinsicsBuffer.updateFrequency = UpdateFrequency::Always;

openVulkanoCpp/Scene/Shader/Shader.hpp

@@ -40,6 +40,18 @@ namespace OpenVulkano::Scene
 		PATCH_LIST
 	};
 
+	enum class CompareOp : uint32_t
+	{
+		NEVER = 0,
+		LESS = 1,
+		EQUAL = 2,
+		LESS_OR_EQUAL = 3,
+		GREATER = 4,
+		NOT_EQUAL = 5,
+		GREATER_OR_EQUAL = 6,
+		ALWAYS = 7
+	};
+
 	struct ShaderProgram
 	{
 		ShaderProgramType type;
@@ -77,6 +89,7 @@ namespace OpenVulkano::Scene
 		Topology topology = Topology::TRIANGLE_LIST;
 		CullMode cullMode = CullMode::BACK;
 		ICloseable* renderShader = nullptr;
+		CompareOp depthCompareOp = CompareOp::LESS;
 		bool alphaBlend = false; // TODO allow fine control over blending
 		bool depthTest = true;
 		bool depthWrite = true;

openVulkanoCpp/Shader/background.vert

@@ -27,10 +27,9 @@ layout(set = 2, binding = 0) uniform RealCameraData
 layout(location = 0) out vec2 textureCoordinates;
 layout(location = 1) out float scaleOut;
 
-const float FLOAT_MAX_LESS_THAN_1 = 0.999999940395355224609;
 // Background plane positions are in clipped space
 const vec4 PLANE[4] = vec4[](
-        vec4(1, -1, FLOAT_MAX_LESS_THAN_1, 1), vec4(-1, -1, FLOAT_MAX_LESS_THAN_1, 1), vec4(1, 1, FLOAT_MAX_LESS_THAN_1, 1), vec4(-1, 1, FLOAT_MAX_LESS_THAN_1, 1)
+        vec4(1, -1, 1, 1), vec4(-1, -1, 1, 1), vec4(1, 1, 1, 1), vec4(-1, 1, 1, 1)
     );
 const vec2 TEX_COORDS[4] = vec2[](
         vec2(1, 0), vec2(0, 0), vec2(1, 1), vec2(0, 1)

openVulkanoCpp/Vulkan/Scene/VulkanShader.cpp

@@ -80,7 +80,7 @@ namespace OpenVulkano::Vulkan
 		vk::PipelineRasterizationStateCreateInfo rasterizer = {};
 		rasterizer.cullMode = static_cast<vk::CullModeFlagBits>(shader->cullMode);
 		vk::PipelineMultisampleStateCreateInfo msaa = {};
-		vk::PipelineDepthStencilStateCreateInfo depth = { {}, shader->depthTest, shader->depthWrite, vk::CompareOp::eLess };
+		vk::PipelineDepthStencilStateCreateInfo depth = { {}, shader->depthTest, shader->depthWrite, static_cast<vk::CompareOp>(shader->depthCompareOp) };
 		depth.maxDepthBounds = 1;
 		vk::PipelineColorBlendAttachmentState colorBlendAttachment = {};
 		colorBlendAttachment.colorWriteMask = vk::ColorComponentFlagBits::eA | vk::ColorComponentFlagBits::eB | vk::ColorComponentFlagBits::eG | vk::ColorComponentFlagBits::eR;