Add demo/test for many primitives hitting the same pixel in one drawcall

util/test/demos/CMakeLists.txt

@@ -87,6 +87,7 @@ set(VULKAN_SRC
         vk/vk_test.cpp
         vk/vk_test.h
         vk/vk_adv_cbuffer_zoo.cpp
+        vk/vk_blend.cpp
         vk/vk_buffer_truncation.cpp
         vk/vk_cbuffer_zoo.cpp
         vk/vk_compute_only.cpp

util/test/demos/demos.vcxproj

@@ -296,6 +296,7 @@
     <ClCompile Include="main.cpp" />
     <ClCompile Include="test_common.cpp" />
     <ClCompile Include="texture_zoo.cpp" />
+    <ClCompile Include="vk\vk_blend.cpp" />
     <ClCompile Include="vk\vk_compute_only.cpp" />
     <ClCompile Include="vk\vk_custom_border_color.cpp" />
     <ClCompile Include="vk\vk_dedicated_allocation.cpp" />

util/test/demos/demos.vcxproj.filters

@@ -673,6 +673,9 @@
     <ClCompile Include="d3d12\d3d12_template.cpp">
       <Filter>D3D12\demos</Filter>
     </ClCompile>
+    <ClCompile Include="vk\vk_blend.cpp">
+      <Filter>Vulkan\demos</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="D3D11">

util/test/demos/vk/vk_blend.cpp

@@ -0,0 +1,219 @@
+/******************************************************************************
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019-2023 Baldur Karlsson
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ ******************************************************************************/
+
+#include "vk_test.h"
+
+RD_TEST(VK_Blend, VulkanGraphicsTest)
+{
+  static constexpr const char *Description =
+      "Draws a triangle repeatedly to test blending within a single drawcall";
+
+  const DefaultA2V TemplateTriangleRed[3] = {
+      {Vec3f(-0.5f, -0.5f, 0.0f), Vec4f(1 / 255.f, 0.0f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
+      {Vec3f(0.0f, 0.5f, 0.0f), Vec4f(1 / 255.f, 0.0f, 0.0f, 1.0f), Vec2f(0.0f, 1.0f)},
+      {Vec3f(0.5f, -0.5f, 0.0f), Vec4f(1 / 255.f, 0.0f, 0.0f, 1.0f), Vec2f(1.0f, 0.0f)},
+  };
+  const int TRIANGLES_RED_INDEX = 0;
+  const int NUM_TRIANGLES_RED = 16;
+  const DefaultA2V TemplateTriangleGreen[3] = {
+      {Vec3f(-0.5f, -0.5f, 0.0f), Vec4f(0.0f, 1 / 255.f, 0.0f, 1.0f), Vec2f(0.0f, 0.0f)},
+      {Vec3f(0.0f, 0.5f, 0.0f), Vec4f(0.0f, 1 / 255.f, 0.0f, 1.0f), Vec2f(0.0f, 1.0f)},
+      {Vec3f(0.5f, -0.5f, 0.0f), Vec4f(0.0f, 1 / 255.f, 0.0f, 1.0f), Vec2f(1.0f, 0.0f)},
+  };
+  const int TRIANGLES_GREEN_INDEX = TRIANGLES_RED_INDEX + NUM_TRIANGLES_RED;
+  const int NUM_TRIANGLES_GREEN = 255;
+  const DefaultA2V TemplateTriangleBlue[3] = {
+      {Vec3f(-0.5f, -0.5f, 0.0f), Vec4f(0.0f, 0.0f, 1 / 255.f, 1.0f), Vec2f(0.0f, 0.0f)},
+      {Vec3f(0.0f, 0.5f, 0.0f), Vec4f(0.0f, 0.0f, 1 / 255.f, 1.0f), Vec2f(0.0f, 1.0f)},
+      {Vec3f(0.5f, -0.5f, 0.0f), Vec4f(0.0f, 0.0f, 1 / 255.f, 1.0f), Vec2f(1.0f, 0.0f)},
+  };
+  const int TRIANGLES_BLUE_INDEX = TRIANGLES_GREEN_INDEX + NUM_TRIANGLES_GREEN;
+  const int NUM_TRIANGLES_BLUE = 512;
+
+  const int NUM_TRIANGLES_TOTAL = TRIANGLES_BLUE_INDEX + NUM_TRIANGLES_BLUE;
+
+  int main()
+  {
+    // initialise, create window, create context, etc
+    if(!Init())
+      return 3;
+
+    VkPipelineLayout layout = createPipelineLayout(vkh::PipelineLayoutCreateInfo());
+
+    std::vector<DefaultA2V> triangles;
+    triangles.reserve(3 * NUM_TRIANGLES_TOTAL);
+    for(int i = 0; i < NUM_TRIANGLES_RED; i++)
+    {
+      triangles.push_back(TemplateTriangleRed[0]);
+      triangles.push_back(TemplateTriangleRed[1]);
+      triangles.push_back(TemplateTriangleRed[2]);
+    }
+    for(int i = 0; i < NUM_TRIANGLES_GREEN; i++)
+    {
+      triangles.push_back(TemplateTriangleGreen[0]);
+      triangles.push_back(TemplateTriangleGreen[1]);
+      triangles.push_back(TemplateTriangleGreen[2]);
+    }
+    for(int i = 0; i < NUM_TRIANGLES_BLUE; i++)
+    {
+      triangles.push_back(TemplateTriangleBlue[0]);
+      triangles.push_back(TemplateTriangleBlue[1]);
+      triangles.push_back(TemplateTriangleBlue[2]);
+    }
+
+    AllocatedBuffer vb(this, vkh::BufferCreateInfo(sizeof(DefaultA2V) * 3 * NUM_TRIANGLES_TOTAL,
+                                                   VK_BUFFER_USAGE_VERTEX_BUFFER_BIT |
+                                                       VK_BUFFER_USAGE_TRANSFER_DST_BIT),
+                       VmaAllocationCreateInfo({0, VMA_MEMORY_USAGE_CPU_TO_GPU}));
+
+    vb.upload(triangles.data(), sizeof(DefaultA2V) * 3 * NUM_TRIANGLES_TOTAL);
+
+    AllocatedImage img(
+        this,
+        vkh::ImageCreateInfo(mainWindow->scissor.extent.width, mainWindow->scissor.extent.height, 0,
+                             VK_FORMAT_R32G32B32A32_SFLOAT,
+                             VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
+                                 VK_IMAGE_USAGE_TRANSFER_DST_BIT),
+        VmaAllocationCreateInfo({0, VMA_MEMORY_USAGE_GPU_ONLY}));
+
+    VkImageView imgview = createImageView(
+        vkh::ImageViewCreateInfo(img.image, VK_IMAGE_VIEW_TYPE_2D, VK_FORMAT_R32G32B32A32_SFLOAT));
+
+    vkh::RenderPassCreator renderPassCreateInfo;
+
+    renderPassCreateInfo.attachments.push_back(vkh::AttachmentDescription(
+        VK_FORMAT_R32G32B32A32_SFLOAT, VK_IMAGE_LAYOUT_GENERAL, VK_IMAGE_LAYOUT_GENERAL));
+
+    renderPassCreateInfo.addSubpass({VkAttachmentReference({0, VK_IMAGE_LAYOUT_GENERAL})});
+
+    VkRenderPass renderPass = createRenderPass(renderPassCreateInfo);
+
+    VkFramebuffer framebuffer = createFramebuffer(
+        vkh::FramebufferCreateInfo(renderPass, {imgview}, mainWindow->scissor.extent));
+
+    vkh::GraphicsPipelineCreateInfo pipeCreateInfo;
+
+    pipeCreateInfo.layout = layout;
+    pipeCreateInfo.renderPass = renderPass;
+
+    VkPipelineColorBlendAttachmentState colorBlendAttachment = {};
+    colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT |
+                                          VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
+    colorBlendAttachment.blendEnable = VK_TRUE;
+    colorBlendAttachment.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+    colorBlendAttachment.dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
+    colorBlendAttachment.colorBlendOp = VK_BLEND_OP_ADD;
+    colorBlendAttachment.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
+    colorBlendAttachment.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
+    colorBlendAttachment.alphaBlendOp = VK_BLEND_OP_ADD;
+    pipeCreateInfo.colorBlendState.attachments = {colorBlendAttachment};
+
+    pipeCreateInfo.vertexInputState.vertexBindingDescriptions = {vkh::vertexBind(0, DefaultA2V)};
+    pipeCreateInfo.vertexInputState.vertexAttributeDescriptions = {
+        vkh::vertexAttr(0, 0, DefaultA2V, pos), vkh::vertexAttr(1, 0, DefaultA2V, col),
+        vkh::vertexAttr(2, 0, DefaultA2V, uv),
+    };
+
+    pipeCreateInfo.stages = {
+        CompileShaderModule(VKDefaultVertex, ShaderLang::glsl, ShaderStage::vert, "main"),
+        CompileShaderModule(VKDefaultPixel, ShaderLang::glsl, ShaderStage::frag, "main"),
+    };
+
+    VkPipeline pipe = createGraphicsPipeline(pipeCreateInfo);
+
+    while(Running())
+    {
+      VkCommandBuffer cmd = GetCommandBuffer();
+
+      vkBeginCommandBuffer(cmd, vkh::CommandBufferBeginInfo());
+
+      StartUsingBackbuffer(cmd, VK_ACCESS_TRANSFER_WRITE_BIT, VK_IMAGE_LAYOUT_GENERAL);
+
+      vkh::cmdPipelineBarrier(cmd, {
+                                       vkh::ImageMemoryBarrier(0, VK_ACCESS_TRANSFER_WRITE_BIT,
+                                                               VK_IMAGE_LAYOUT_UNDEFINED,
+                                                               VK_IMAGE_LAYOUT_GENERAL, img.image),
+                                   });
+
+      pushMarker(cmd, "Clear");
+      vkCmdClearColorImage(cmd, img.image, VK_IMAGE_LAYOUT_GENERAL,
+                           vkh::ClearColorValue(0.0f, 0.0f, 0.0f, 1.0f), 1,
+                           vkh::ImageSubresourceRange());
+
+      popMarker(cmd);
+
+      vkCmdBeginRenderPass(cmd,
+                           vkh::RenderPassBeginInfo(renderPass, framebuffer, mainWindow->scissor),
+                           VK_SUBPASS_CONTENTS_INLINE);
+
+      vkCmdBindPipeline(cmd, VK_PIPELINE_BIND_POINT_GRAPHICS, pipe);
+      vkCmdSetViewport(cmd, 0, 1, &mainWindow->viewport);
+      vkCmdSetScissor(cmd, 0, 1, &mainWindow->scissor);
+      vkh::cmdBindVertexBuffers(cmd, 0, {vb.buffer}, {0});
+      pushMarker(cmd, "Red: groups of repeated draws");
+      for(int i = 1; i <= NUM_TRIANGLES_RED; i *= 2)
+      {
+        vkCmdDraw(cmd, 3 * i, 1, TRIANGLES_RED_INDEX, 0);
+      }
+      setMarker(cmd, "End of red");
+      popMarker(cmd);
+      pushMarker(cmd, "Green: 255 (the maximum we can handle) in a single drawcall");
+      vkCmdDraw(cmd, 3 * NUM_TRIANGLES_GREEN, 1, 3 * TRIANGLES_GREEN_INDEX, 0);
+      popMarker(cmd);
+      pushMarker(cmd, "Blue: 512 (more than the maximum) in a single drawcall");
+      vkCmdDraw(cmd, 3 * NUM_TRIANGLES_BLUE, 1, 3 * TRIANGLES_BLUE_INDEX, 0);
+      popMarker(cmd);
+
+      vkCmdEndRenderPass(cmd);
+
+      pushMarker(cmd, "Clear");
+      vkCmdClearColorImage(cmd, img.image, VK_IMAGE_LAYOUT_GENERAL,
+                           vkh::ClearColorValue(0.0f, 0.0f, 0.0f, 1.0f), 1,
+                           vkh::ImageSubresourceRange());
+      popMarker(cmd);
+
+      vkCmdBeginRenderPass(cmd,
+                           vkh::RenderPassBeginInfo(renderPass, framebuffer, mainWindow->scissor),
+                           VK_SUBPASS_CONTENTS_INLINE);
+
+      pushMarker(cmd, "All of the above in a single drawcall");
+      vkCmdDraw(cmd, 3 * NUM_TRIANGLES_TOTAL, 1, 3 * TRIANGLES_RED_INDEX, 0);
+      popMarker(cmd);
+
+      setMarker(cmd, "Test End");
+
+      vkCmdEndRenderPass(cmd);
+
+      FinishUsingBackbuffer(cmd, VK_ACCESS_TRANSFER_WRITE_BIT, VK_IMAGE_LAYOUT_GENERAL);
+
+      vkEndCommandBuffer(cmd);
+
+      SubmitAndPresent({cmd});
+    }
+
+    return 0;
+  }
+};
+
+REGISTER_TEST();