From b79473a8818fc57162c925e0ad9922b6da277e16 Mon Sep 17 00:00:00 2001
From: Zack Buhman <zack@buhman.org>
Date: Thu, 30 Apr 2026 15:43:28 -0500
Subject: [PATCH] minecraft: texture sampling

---
 Makefile                    |   2 +-
 data/minecraft/terrain2.dds | Bin 0 -> 22020 bytes
 data/minecraft/terrain2.png | Bin 0 -> 12659 bytes
 filenames.txt               |   2 +
 include/minecraft/vulkan.h  |  21 ++++-
 shader/minecraft.hlsl       |  19 ++++-
 src/main.cpp                |   4 +-
 src/minecraft/vulkan.cpp    | 148 ++++++++++++++++++++++++++++++++++--
 8 files changed, 185 insertions(+), 11 deletions(-)
 create mode 100644 data/minecraft/terrain2.dds
 create mode 100644 data/minecraft/terrain2.png

diff --git a/Makefile b/Makefile
index a801336..e3cc623 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ CFLAGS += -I./data
 CFLAGS += -I../SDL3-dist/include
 CFLAGS += -fpic
 
-FLAGS += -fstack-protector -fstack-protector-all -fno-omit-frame-pointer -fsanitize=address
+#FLAGS += -fstack-protector -fstack-protector-all -fno-omit-frame-pointer -fsanitize=address
 
 LDFLAGS += -lm
 ifeq ($(UNAME),Linux)
diff --git a/data/minecraft/terrain2.dds b/data/minecraft/terrain2.dds
new file mode 100644
index 0000000000000000000000000000000000000000..796b72700cbc4834e6761d370f668ad657cc1e1d
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/filenames.txt b/filenames.txt
index 923aef2..fb4c619 100644
--- a/filenames.txt
+++ b/filenames.txt
@@ -33,3 +33,5 @@ data/minecraft/midnightmeadow/region.0.-1.instance.cfg
 data/minecraft/midnightmeadow/region.-1.-1.instance.cfg
 data/minecraft/midnightmeadow/global.dump
 data/minecraft/midnightmeadow/global.lights.vtx
+
+data/minecraft/terrain2.dds
diff --git a/include/minecraft/vulkan.h b/include/minecraft/vulkan.h
index e2a1b95..772221a 100644
--- a/include/minecraft/vulkan.h
+++ b/include/minecraft/vulkan.h
@@ -19,7 +19,7 @@ namespace minecraft::vulkan {
     static constexpr uint32_t maxFrames = 2;
     static constexpr uint32_t perFrameDescriptorCount = 1;
     static constexpr uint32_t uniformBufferDescriptorCount = maxFrames * perFrameDescriptorCount;
-    static constexpr uint32_t bindingCount = uniformBufferDescriptorCount + 0;
+    static constexpr uint32_t bindingCount = uniformBufferDescriptorCount + 3;
 
     static constexpr int perVertexSize = (3 + 3 + 2) * 2;
     static constexpr int perInstanceSize = (3 + 1 + 3 + 1) * 2;
@@ -43,6 +43,9 @@ namespace minecraft::vulkan {
     VkFormat colorFormat;
     VkFormat depthFormat;
 
+    VkSampler linearSampler;
+    VkImageView shadowDepthImageView;
+
     //
     // method initialized
     //
@@ -54,8 +57,16 @@ namespace minecraft::vulkan {
 
     VkDescriptorPool descriptorPool{ VK_NULL_HANDLE };
 
-    VkDescriptorSetLayout descriptorSetLayouts[1]; // unrelated to maxFrames, unrelated to descriptorCount
+    VkDescriptorSetLayout descriptorSetLayouts[2]; // unrelated to maxFrames, unrelated to descriptorCount
     VkDescriptorSet descriptorSets0[maxFrames];
+    VkDescriptorSet descriptorSet1;
+
+    struct Image {
+      VkImage image;
+      VkDeviceMemory memory;
+      VkImageView imageView;
+    };
+    Image terrainImage;
 
     struct {
       VkDeviceMemory memory;
@@ -76,7 +87,9 @@ namespace minecraft::vulkan {
                        VkPhysicalDeviceProperties physicalDeviceProperties,
                        VkPhysicalDeviceMemoryProperties physicalDeviceMemoryProperties,
                        VkFormat colorFormat,
-                       VkFormat depthFormat);
+                       VkFormat depthFormat,
+                       VkSampler linearSampler,
+                       VkImageView shadowDepthImageView);
     void init();
     void load_vertex_index_buffer(char const * vertex_filename,
                                   char const * index_filename);
@@ -89,6 +102,8 @@ namespace minecraft::vulkan {
     void transfer_transforms(XMMATRIX const & projection,
                              XMMATRIX const & view,
                              uint32_t frameIndex);
+    void load_image(char const * filename,
+                    Image & image);
 
     void draw(VkCommandBuffer commandBuffer,
               uint32_t frameIndex);
diff --git a/shader/minecraft.hlsl b/shader/minecraft.hlsl
index 7f2cb4f..924020b 100644
--- a/shader/minecraft.hlsl
+++ b/shader/minecraft.hlsl
@@ -14,6 +14,7 @@ struct VSInput
 struct VSOutput
 {
   float4 Position : SV_POSITION;
+  float4 Texture : TEXCOORD0;
 };
 
 struct Scene
@@ -28,17 +29,33 @@ struct Scene
 // set 0: per-frame
 [[vk::binding(0, 0)]] ConstantBuffer<Scene> Scene;
 
+// set 1: constant
+[[vk::binding(0, 1)]] SamplerState LinearSampler;
+[[vk::binding(1, 1)]] Texture2DArray ShadowTexture;
+[[vk::binding(2, 1)]] Texture2D TerrainTexture;
+
+float2 yf(float2 v, float scale)
+{
+  return float2(v.x, 1.0 - v.y) * scale;
+}
+
 [shader("vertex")]
 VSOutput VSMain(VSInput input)
 {
   VSOutput output = (VSOutput)0;
   float4 Position = float4(input.Position.xyz + input.BlockPosition, 1.0);
   output.Position = mul(Scene.Projection, mul(Scene.View, Position));
+
+  float2 textureOffset = float2(input.TextureID % 8, input.TextureID / 8) * 16;
+  output.Texture = float4(yf(input.Texture.xy, 16), textureOffset);
   return output;
 }
 
 [shader("pixel")]
 float4 PSMain(VSOutput input) : SV_TARGET
 {
-  return float4(1, 0, 0, 1);
+  float2 texture = input.Texture.xy + input.Texture.zw;
+  float4 color = TerrainTexture.Load(int3(texture, 0)).xyzw;
+
+  return float4(color.xyz, 1);
 }
diff --git a/src/main.cpp b/src/main.cpp
index a93791f..a9ea530 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -609,7 +609,9 @@ int main()
                                 physicalDeviceProperties,
                                 physicalDeviceMemoryProperties,
                                 surfaceFormat.format,
-                                depthFormat);
+                                depthFormat,
+                                textureSamplers[0],
+                                shadowDepthImageViewDepth);
   minecraft_state.init();
 
   //////////////////////////////////////////////////////////////////////
diff --git a/src/minecraft/vulkan.cpp b/src/minecraft/vulkan.cpp
index 90d5b43..cc97b0b 100644
--- a/src/minecraft/vulkan.cpp
+++ b/src/minecraft/vulkan.cpp
@@ -29,7 +29,9 @@ namespace minecraft::vulkan {
                              VkPhysicalDeviceProperties physicalDeviceProperties,
                              VkPhysicalDeviceMemoryProperties physicalDeviceMemoryProperties,
                              VkFormat colorFormat,
-                             VkFormat depthFormat)
+                             VkFormat depthFormat,
+                             VkSampler linearSampler,
+                             VkImageView shadowDepthImageView)
   {
     this->instance = instance;
     this->device = device;
@@ -41,12 +43,16 @@ namespace minecraft::vulkan {
 
     this->colorFormat = colorFormat;
     this->depthFormat = depthFormat;
+
+    this->linearSampler = linearSampler;
+    this->shadowDepthImageView = shadowDepthImageView;
   }
 
   void vulkan::init()
   {
     load_vertex_index_buffer("data/minecraft/per_vertex.vtx", "data/minecraft/configuration.idx");
     load_shader();
+    load_image("data/minecraft/terrain2.dds", terrainImage);
     create_uniform_buffers();
     create_descriptor_sets();
     write_descriptor_sets();
@@ -142,7 +148,7 @@ namespace minecraft::vulkan {
   {
     VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo{
       .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
-      .setLayoutCount = 1,
+      .setLayoutCount = 2,
       .pSetLayouts = descriptorSetLayouts,
       //.pushConstantRangeCount = 0,
       //.pPushConstantRanges = nullptr
@@ -388,6 +394,49 @@ namespace minecraft::vulkan {
     assert(offsetsIndex == uniformBufferDescriptorCount);
   }
 
+  //////////////////////////////////////////////////////////////////////
+  // images
+  //////////////////////////////////////////////////////////////////////
+
+  void vulkan::load_image(char const * filename,
+                          Image & image)
+  {
+    VkCommandBuffer commandBuffer{};
+    VkCommandBufferAllocateInfo commandBufferAllocateInfo{
+      .sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO,
+      .commandPool = commandPool,
+      .commandBufferCount = 1
+    };
+    VK_CHECK(vkAllocateCommandBuffers(device, &commandBufferAllocateInfo, &commandBuffer));
+
+    VkFenceCreateInfo fenceCreateInfo{
+      .sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO
+    };
+    VkFence fence{};
+    VK_CHECK(vkCreateFence(device, &fenceCreateInfo, nullptr, &fence));
+
+    // load
+
+    createImageFromFilenameDDS(device,
+                               queue,
+                               commandBuffer,
+                               fence,
+                               physicalDeviceProperties.limits.nonCoherentAtomSize,
+                               physicalDeviceMemoryProperties,
+                               filename,
+                               &image.image,
+                               &image.memory,
+                               &image.imageView);
+
+    // cleanup
+
+    vkDestroyFence(device, fence, nullptr);
+    vkFreeCommandBuffers(device,
+                         commandPool,
+                         1,
+                         &commandBuffer);
+  }
+
   //////////////////////////////////////////////////////////////////////
   // descriptor sets
   //////////////////////////////////////////////////////////////////////
@@ -397,16 +446,24 @@ namespace minecraft::vulkan {
     //
     // pool
     //
-    constexpr int descriptorPoolSizesCount = 1;
+    constexpr int descriptorPoolSizesCount = 3;
     VkDescriptorPoolSize descriptorPoolSizes[descriptorPoolSizesCount]{
       {
         .type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
         .descriptorCount = (maxFrames * 1),
       },
+      { // linear sampler
+        .type = VK_DESCRIPTOR_TYPE_SAMPLER,
+        .descriptorCount = 1,
+      },
+      {
+        .type = VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,
+        .descriptorCount = 1 + 1, // +1 for shadow sampler
+      }
     };
     VkDescriptorPoolCreateInfo descriptorPoolCreateInfo{
       .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO,
-      .maxSets = maxFrames,
+      .maxSets = maxFrames + 1,
       .poolSizeCount = descriptorPoolSizesCount,
       .pPoolSizes = descriptorPoolSizes
     };
@@ -446,6 +503,48 @@ namespace minecraft::vulkan {
       };
       VK_CHECK(vkAllocateDescriptorSets(device, &descriptorSetAllocateInfo, descriptorSets0));
     }
+
+    //
+    // uniform buffer descriptor set layout/allocation (set 1, constant)
+    //
+    {
+      constexpr int bindingCount = 3;
+      VkDescriptorSetLayoutBinding descriptorSetLayoutBindings[bindingCount]{
+        {
+          .binding = 0,
+          .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLER,
+          .descriptorCount = 1,
+          .stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT
+        },
+        { // shadow sampled image
+          .binding = 1,
+          .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,
+          .descriptorCount = 1,
+          .stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT
+        },
+        { // terrain sampled image
+          .binding = 2,
+          .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,
+          .descriptorCount = 1,
+          .stageFlags = VK_SHADER_STAGE_FRAGMENT_BIT
+        }
+      };
+
+      VkDescriptorSetLayoutCreateInfo descriptorSetLayoutCreateInfo{
+        .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
+        .bindingCount = bindingCount,
+        .pBindings = descriptorSetLayoutBindings
+      };
+      VK_CHECK(vkCreateDescriptorSetLayout(device, &descriptorSetLayoutCreateInfo, nullptr, &descriptorSetLayouts[1]));
+
+      VkDescriptorSetAllocateInfo descriptorSetAllocateInfo{
+        .sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
+        .descriptorPool = descriptorPool,
+        .descriptorSetCount = 1,
+        .pSetLayouts = &descriptorSetLayouts[1]
+      };
+      VK_CHECK(vkAllocateDescriptorSets(device, &descriptorSetAllocateInfo, &descriptorSet1));
+    }
   }
 
   //////////////////////////////////////////////////////////////////////
@@ -459,6 +558,7 @@ namespace minecraft::vulkan {
 
     VkDescriptorBufferInfo sceneDescriptorBufferInfos[maxFrames];
 
+    // set0 bindings
     for (uint32_t i = 0; i < maxFrames; i++) {
       sceneDescriptorBufferInfos[i] = {
         .buffer = shaderDataDevice.frame[i].sceneBuffer,
@@ -475,6 +575,43 @@ namespace minecraft::vulkan {
       };
     }
 
+    // set1 bindings
+    VkDescriptorImageInfo samplerDescriptorImageInfo = {
+      .sampler = linearSampler,
+    };
+    writeDescriptorSets[writeIndex++] = {
+      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
+      .dstSet = descriptorSet1,
+      .dstBinding = 0,
+      .descriptorCount = 1,
+      .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLER,
+      .pImageInfo = &samplerDescriptorImageInfo
+    };
+    VkDescriptorImageInfo shadowDepthDescriptorImageInfo = {
+      .imageView = shadowDepthImageView,
+      .imageLayout = VK_IMAGE_LAYOUT_READ_ONLY_OPTIMAL
+    };
+    writeDescriptorSets[writeIndex++] = {
+      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
+      .dstSet = descriptorSet1,
+      .dstBinding = 1,
+      .descriptorCount = 1,
+      .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,
+      .pImageInfo = &shadowDepthDescriptorImageInfo
+    };
+    VkDescriptorImageInfo terrainDescriptorImageInfo = {
+      .imageView = terrainImage.imageView,
+      .imageLayout = VK_IMAGE_LAYOUT_READ_ONLY_OPTIMAL
+    };
+    writeDescriptorSets[writeIndex++] = {
+      .sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET,
+      .dstSet = descriptorSet1,
+      .dstBinding = 2,
+      .descriptorCount = 1,
+      .descriptorType = VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE,
+      .pImageInfo = &terrainDescriptorImageInfo
+    };
+
     assert(writeIndex == bindingCount);
     vkUpdateDescriptorSets(device, writeIndex, writeDescriptorSets, 0, nullptr);
   }
@@ -529,11 +666,12 @@ namespace minecraft::vulkan {
   {
     VkDescriptorSet descriptorSets[2] = {
       descriptorSets0[frameIndex],
+      descriptorSet1,
     };
     vkCmdBindDescriptorSets(commandBuffer,
                             VK_PIPELINE_BIND_POINT_GRAPHICS,
                             pipelineLayout,
-                            0, 1, descriptorSets,
+                            0, 2, descriptorSets,
                             0, nullptr);
 
     vkCmdBindIndexBuffer(commandBuffer, vertexIndex.buffer, vertexIndex.indexOffset, VK_INDEX_TYPE_UINT16);