Added new shaders, modified logs messages, continued the tutorial.

shaders/gradient_color.comp

@@ -0,0 +1,29 @@
+#version 460
+
+layout (local_size_x = 16, local_size_y = 16) in;
+
+layout(rgba16f,set = 0, binding = 0) uniform image2D image;
+
+//push constants block
+layout( push_constant ) uniform constants
+{
+ vec4 data1;
+ vec4 data2;
+ vec4 data3;
+ vec4 data4;
+} PushConstants;
+
+void main() {
+  ivec2 texelCoord = ivec2(gl_GlobalInvocationID.xy);
+
+  ivec2 size = imageSize(image);
+
+  vec4 topColor = PushConstants.data1;
+  vec4 bottomColor = PushConstants.data2;
+
+  if(texelCoord.x < size.x && texelCoord.y < size.y) {
+    float blend = float(texelCoord.y)/(size.y);
+
+    imageStore(image, texelCoord, mix(topColor,bottomColor, blend));
+  }
+}

shaders/sky.comp

@@ -0,0 +1,91 @@
+#version 450
+layout (local_size_x = 16, local_size_y = 16) in;
+layout(rgba16f,set = 0, binding = 0) uniform image2D image;
+
+// License Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
+
+//push constants block
+layout( push_constant ) uniform constants
+{
+ vec4 data1;
+ vec4 data2;
+ vec4 data3;
+ vec4 data4;
+} PushConstants;
+
+// Return random noise in the range [0.0, 1.0], as a function of x.
+float Noise2d( in vec2 x )
+{
+    float xhash = cos( x.x * 37.0 );
+    float yhash = cos( x.y * 57.0 );
+    return fract( 415.92653 * ( xhash + yhash ) );
+}
+
+// Convert Noise2d() into a "star field" by stomping everthing below fThreshhold to zero.
+float NoisyStarField( in vec2 vSamplePos, float fThreshhold )
+{
+    float StarVal = Noise2d( vSamplePos );
+    if ( StarVal >= fThreshhold )
+        StarVal = pow( (StarVal - fThreshhold)/(1.0 - fThreshhold), 6.0 );
+    else
+        StarVal = 0.0;
+    return StarVal;
+}
+
+// Stabilize NoisyStarField() by only sampling at integer values.
+float StableStarField( in vec2 vSamplePos, float fThreshhold )
+{
+    // Linear interpolation between four samples.
+    // Note: This approach has some visual artifacts.
+    // There must be a better way to "anti alias" the star field.
+    float fractX = fract( vSamplePos.x );
+    float fractY = fract( vSamplePos.y );
+    vec2 floorSample = floor( vSamplePos );
+    float v1 = NoisyStarField( floorSample, fThreshhold );
+    float v2 = NoisyStarField( floorSample + vec2( 0.0, 1.0 ), fThreshhold );
+    float v3 = NoisyStarField( floorSample + vec2( 1.0, 0.0 ), fThreshhold );
+    float v4 = NoisyStarField( floorSample + vec2( 1.0, 1.0 ), fThreshhold );
+
+    float StarVal =   v1 * ( 1.0 - fractX ) * ( 1.0 - fractY )
+        			+ v2 * ( 1.0 - fractX ) * fractY
+        			+ v3 * fractX * ( 1.0 - fractY )
+        			+ v4 * fractX * fractY;
+	return StarVal;
+}
+
+void mainImage( out vec4 fragColor, in vec2 fragCoord )
+{
+  vec2 iResolution = imageSize(image);
+  // Sky Background Color
+  //vec3 vColor = vec3( 0.1, 0.2, 0.4 ) * fragCoord.y / iResolution.y;
+  vec3 vColor = PushConstants.data1.xyz * fragCoord.y / iResolution.y;
+
+  // Note: Choose fThreshhold in the range [0.99, 0.9999].
+  // Higher values (i.e., closer to one) yield a sparser starfield.
+  float StarFieldThreshhold = PushConstants.data1.w;//0.97;
+
+  // Stars with a slow crawl.
+  float xRate = 0.2;
+  float yRate = -0.06;
+  vec2 vSamplePos = fragCoord.xy + vec2( xRate * float( 1 ), yRate * float( 1 ) );
+  float StarVal = StableStarField( vSamplePos, StarFieldThreshhold );
+  vColor += vec3( StarVal );
+
+  fragColor = vec4(vColor, 1.0);
+}
+
+
+
+void main()
+{
+	vec4 value = vec4(0.0, 0.0, 0.0, 1.0);
+    ivec2 texelCoord = ivec2(gl_GlobalInvocationID.xy);
+	ivec2 size = imageSize(image);
+    if(texelCoord.x < size.x && texelCoord.y < size.y)
+    {
+        vec4 color;
+        mainImage(color,texelCoord);
+
+        imageStore(image, texelCoord, color);
+    }
+}

src/Engine/engine/callbacks.h

@@ -17,7 +17,7 @@ class Callback {
 
 void Callback::keyboardCallback(GLFWwindow* window, int key, int scancode, int action, int mods) {
   #ifdef DEBUG
-  fmt::println("Key pressed, key {}", key);
+  fmt::println("[Engine:Info] Key pressed, key {}", key);
   #endif
 }
 

src/Engine/engine/engine.h

@@ -2,6 +2,8 @@
 #define ENGINE_H
 // Normal header
 
+// Current progress
+// 3 - Graphics Pipeline - Setting up the render pipeline
 
 #include "descriptors.h" // Required for public interface custom allocator
 #include "Common/Types.h"
@@ -44,7 +46,7 @@ class Engine {
     //========== Class Members ==========
     bool        _isInitialized  { false };
     int         _frameNumber    { 0 };
-    VkExtent2D  _windowExtent   { 1700, 900 };
+    VkExtent2D  _windowExtent   { 1920, 1080 };
 
     GLFWwindow  *window         { nullptr };
 
@@ -204,6 +206,7 @@ void Engine::init() {
   #ifdef DEBUG
   fmt::println("[Engine:Init] Initializing the engine...");
   fmt::println("[Engine:Info] Current engine version {}", BUILD_ID);
+  fmt::println("[Engine:Info] Compiled on {} at {}", __DATE__ ,__TIME__);
   #endif
 
   glfwInit();
@@ -427,6 +430,11 @@ void Engine::run() {
   while (!glfwWindowShouldClose(window)) {
     glfwPollEvents();
 
+    int w, h;
+    glfwGetFramebufferSize(window, &w, &h);
+
+    if (w != _windowExtent.width || h != _windowExtent.height ) { _requestResize = true; };
+
     if (_requestResize) {resizeSwapchain();};
 
     if (glfwGetWindowAttrib(window, GLFW_ICONIFIED)) {
@@ -1096,7 +1104,7 @@ void Engine::buildImgui() {
   // Main ImGui things
   ImGui::ShowDemoWindow();
 
-  if(ImGui::Begin("background")) {
+  if(ImGui::Begin("Background Shader control")) {
     ComputeEffect& selected = backgroundEffects[currentBackgroundEffect];
 
     ImGui::Text(
@@ -1318,7 +1326,7 @@ void Engine::resizeSwapchain() {
   destroySwapchain();
 
   int w, h;
-  glfwGetWindowSize(window, &w, &h);
+  glfwGetFramebufferSize(window, &w, &h);
 
   _windowExtent.width = w;
   _windowExtent.height = h;

src/Engine/engine/initializers.h

@@ -69,6 +69,12 @@ namespace vkinit {
     VkRenderingAttachmentInfo* colorAttachment,
     VkRenderingAttachmentInfo* depthAttachment
   );
+
+  VkPipelineShaderStageCreateInfo pipelineShaderStageCreateInfo(
+    VkShaderStageFlagBits stage,
+    VkShaderModule shaderModule,
+    const char * entry = "main"
+  );
 }
 
 
@@ -303,6 +309,24 @@ namespace vkinit {
     };
     return renderInfo;
   }
+
+  VkPipelineShaderStageCreateInfo pipelineShaderStageCreateInfo(
+    VkShaderStageFlagBits stage,
+    VkShaderModule shaderModule,
+    const char * entry
+  ) {
+    VkPipelineShaderStageCreateInfo info {
+      .sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+      .pNext = nullptr,
+
+      .stage = stage,
+      .module = shaderModule,
+
+      .pName = entry
+    };
+
+    return info;
+  }
 }
 #endif
 #endif

src/Engine/engine/pipelines.h

@@ -17,6 +17,36 @@ namespace vkutil {
   );
 };
 
+class PipelineBuilder {
+  public:
+    std::vector<VkPipelineShaderStageCreateInfo>    _shaderStages;
+
+    VkPipelineInputAssemblyStateCreateInfo          _inputAssembly;
+    VkPipelineRasterizationStateCreateInfo          _rasterizer;
+    VkPipelineColorBlendAttachmentState             _colorBlendAttachment;
+    VkPipelineMultisampleStateCreateInfo            _multisampling;
+    VkPipelineLayout                                _pipelineLayout;
+    VkPipelineDepthStencilStateCreateInfo           _depthStencil;
+    VkPipelineRenderingCreateInfo                   _renderInfo;
+
+    PipelineBuilder() { clear(); }
+
+    void clear();
+
+    VkPipeline buildPipeline(
+      VkDevice device
+    );
+
+    void setShaders(
+      VkShaderModule vertexShader,
+      VkShaderModule fragmentShader
+    );
+
+    void setInputTopology(
+      VkPrimitiveTopology topology
+    );
+};
+
 #endif
 
 #ifdef PIPELINES_IMPL
@@ -29,12 +59,11 @@ namespace vkutil {
 // Custom imports
 #include "initializers.h"
 
-namespace vkutil {
+bool vkutil::loadShaderModule(
-  bool loadShaderModule(
   const char* filePath,
   VkDevice device,
   VkShaderModule* outShaderModule
-  ) {
+) {
   #ifdef DEBUG
   fmt::println("[Engine:Utils] Loading shader located at {}...", filePath);
   #endif
@@ -88,9 +117,153 @@ namespace vkutil {
   #endif
 
   return true;
+}
+
+void PipelineBuilder::clear() {
+  #ifdef DEBUG
+  fmt::println("[PipelineBuilder] Clearing pipeline...");
+  #endif
+  // Clear structs
+  _inputAssembly = {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO
+  };
+
+  _rasterizer = {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO
+  };
+
+  _colorBlendAttachment = {};
+
+  _multisampling = {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO
+  };
+
+  _pipelineLayout = {};
+
+  _depthStencil = {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO
+  };
+
+  _renderInfo = {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_RENDERING_CREATE_INFO
+  };
+
+  _shaderStages.clear();
+
+  #ifdef DEBUG
+  fmt::println("[PipelineBuilder] Pipeline cleared !");
+  #endif
+}
+
+VkPipeline PipelineBuilder::buildPipeline (
+  VkDevice device
+) {
+  #ifdef DEBUG
+  fmt::println("[PipelineBuilder] Building rasterisation pipeline...");
+  #endif
+  // Make the viewport state from our stored viewport and scissor
+  // This makes it that it won't support multiple viewports or scissors
+  VkPipelineViewportStateCreateInfo viewportState {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO,
+    .pNext = nullptr,
+
+    .viewportCount = 1,
+    .scissorCount  = 1
+  };
+
+  // Setup placeholder color blending.
+  // Need to be changed when using transparent objects, which we aren't rn
+  // The blending is "no blend", but we write it to the color attachment
+  VkPipelineColorBlendStateCreateInfo colorBlending {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO,
+    .pNext = nullptr,
+
+    .logicOpEnable = VK_FALSE,
+    .logicOp = VK_LOGIC_OP_COPY,
+    .attachmentCount = 1,
+    .pAttachments = &_colorBlendAttachment
+  };
+  // Completely clear VertexInputStateCreateInfo, as we have no need for it
+  VkPipelineVertexInputStateCreateInfo _vertexInputInfo {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO
+  };
+
+  // Dynamic Viewport
+  VkDynamicState state[] = {
+    VK_DYNAMIC_STATE_VIEWPORT,
+    VK_DYNAMIC_STATE_SCISSOR
+  };
+
+  VkPipelineDynamicStateCreateInfo dynamicInfo {
+    .sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO,
+    .dynamicStateCount = 2,
+     .pDynamicStates = &state[0]
+  };
+
+  // Build the pipeline
+  // Uses all the class members info structs
+  VkGraphicsPipelineCreateInfo pipelineInfo {
+    .sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO,
+    .pNext = &_renderInfo,
+
+    .stageCount = (uint32_t)_shaderStages.size(),
+    .pStages = _shaderStages.data(),
+
+    .pVertexInputState = &_vertexInputInfo,
+    .pInputAssemblyState = &_inputAssembly,
+    .pViewportState = &viewportState,
+    .pRasterizationState = &_rasterizer,
+    .pMultisampleState = &_multisampling,
+    .pDepthStencilState = &_depthStencil,
+    .pColorBlendState = &colorBlending,
+    .pDynamicState = &dynamicInfo,
+
+    .layout = _pipelineLayout
+  };
+
+  // Check the creation of the pipeline
+  // I don't use the VK_CHECK()
+  // 'cause there might be pipeline-specific options
+  VkPipeline newPipeline;
+
+  if(
+    vkCreateGraphicsPipelines(
+      device,
+      VK_NULL_HANDLE,
+      1,
+      &pipelineInfo,
+      nullptr,
+      &newPipeline
+    ) != VK_SUCCESS
+  ) {
+    fmt::println("[PipelineBuilder] Failed to create pipeline !");
+    return VK_NULL_HANDLE; // Graphics pipeline failed to be created
+  } else {
+    return newPipeline;
   }
-};
 
+}
+
+void PipelineBuilder::setShaders(
+  VkShaderModule vertexShader,
+  VkShaderModule fragmentShader
+) {
+  _shaderStages.clear();
+
+  _shaderStages.push_back(
+    vkinit::pipelineShaderStageCreateInfo(
+      VK_SHADER_STAGE_VERTEX_BIT,
+      vertexShader
+    )
+  );
+
+  _shaderStages.push_back(
+    vkinit::pipelineShaderStageCreateInfo(
+      VK_SHADER_STAGE_FRAGMENT_BIT,
+      fragmentShader
+    )
+  );
+}
 
 #endif
 #endif