Shaders now compile all the way to OpenGL

CMakeLists.txt

@@ -25,6 +25,7 @@ set(DAWN_TEMP_DIR "${DAWN_BUILD_DIR}/temp")
 
 # Options
 option(DAWN_ENABLE_PHYSICS "Enable Physics" OFF)
+option(DAWN_DEBUG_SHADERS "Enable Debug Shaders" ON)
 
 # Initialize Project First.
 project(Dawn

assets/shaders/hello-world.slang

@@ -1,11 +1,7 @@
-struct MVP {
+struct Uniforms {
   float4x4 projection;
   float4x4 view;
   float4x4 model;
-}
-
-struct Uniforms {
-  MVP mvp;
   float4 u_Color;
   bool u_HasTexture;
   Sampler2D u_Texture;
@@ -29,9 +25,10 @@ float4 someFunction(float4 color) {
   return color * float4(0.5, 0.5, 0.5, 1.0);
 }
 
+uniform ParameterBlock<Uniforms> uniforms;
+
 [shader("vertex")]
 VertexStageOutput vertexMain(
-  uniform ParameterBlock<Uniforms> uniforms,
   AssembledVertex assembledVertex
 ) {
   VertexStageOutput output;
@@ -42,7 +39,7 @@ VertexStageOutput vertexMain(
 
   output.sv_position = mul(
     float4(position, 1.0),
-    mul(uniforms.mvp.model, mul(uniforms.mvp.view, uniforms.mvp.projection))
+    mul(uniforms.model, mul(uniforms.view, uniforms.projection))
   );
 
   return output;
@@ -50,7 +47,6 @@ VertexStageOutput vertexMain(
 
 [shader("fragment")]
 Fragment fragmentMain(
-  uniform ParameterBlock<Uniforms> uniforms,
   float2 uv: UV
 ) : SV_Target {
   Fragment output;

src/dawn/CMakeLists.txt

@@ -19,6 +19,12 @@ target_include_directories(${DAWN_TARGET_NAME}
     ${CMAKE_CURRENT_LIST_DIR}
 )
 
+# Definitions
+target_compile_definitions(${DAWN_TARGET_NAME}
+  PUBLIC
+    DAWN_DEBUG_SHADERS=$<BOOL:${DAWN_DEBUG_SHADERS}>
+)
+
 # Subdirs
 add_subdirectory(assert)
 add_subdirectory(asset)

src/dawn/asset/AssetLoader.cpp

@@ -20,6 +20,8 @@ AssetLoader::AssetLoader(
 {
   assertNotNull(assetManager, "AssetManager cannot be null");
   assertTrue(name.size() > 0, "Name cannot be empty");
+
+  std::cout << "Loading: " << name << std::endl;
 }
 
 std::shared_ptr<AssetManager> AssetLoader::getAssetManager() {
@@ -36,4 +38,5 @@ void AssetLoader::loadImmediately() {
 
 AssetLoader::~AssetLoader() {
   this->loaded = false;
+  std::cout << "Unloading: " << name << std::endl;
 }

src/dawn/asset/loader/ShaderLoader.cpp

@@ -8,6 +8,10 @@
 #include "asset/AssetManager.hpp"
 #include "game/Game.hpp"
 
+#if DAWN_DEBUG_SHADERS
+  #include <fstream>
+#endif
+
 using namespace Dawn;
 
 const std::string ShaderLoader::ASSET_TYPE = "shader";
@@ -91,9 +95,21 @@ void ShaderLoader::updateSync() {
     }
 
     // Get the stage information
-    auto entryPointReflection = layout->getEntryPointByIndex(0);
+    auto entryPointReflection = layout->getEntryPointByIndex(i);
     auto stage = entryPointReflection->getStage();
 
+    // Write out to file for debugging
+    #if DAWN_DEBUG_SHADERS
+      std::filesystem::path filePath =
+        "debug/shaders/" + this->name + "/" + std::to_string(i) + ".glsl"
+      ;
+      std::filesystem::create_directories(filePath.parent_path());
+      std::cout << "Writing shader to " << filePath << std::endl;
+      std::ofstream file(filePath);
+      file << (const char*)blob->getBufferPointer();
+      file.close();
+    #endif
+
     // Create the shader entry
     auto shaderStage = std::make_shared<ShaderStage>();
     shaderStage->init(

src/dawn/component/display/material/Material.cpp

@@ -9,6 +9,7 @@
 using namespace Dawn;
 
 void Material::onInit() {
+  this->initShaderPrograms();
 }
 
 void Material::onDispose() {

src/dawn/component/display/material/Material.hpp

@@ -12,9 +12,13 @@ namespace Dawn {
     public SceneComponent,
     public IRenderableComponent
   {
-    private:
-
     protected:
+      /**
+       * Load the shaders for this material.
+       */
+      virtual void initShaderPrograms(
+        
+      ) = 0;
 
     public:
       void onInit() override;

src/dawn/component/display/material/SimpleTexturedMaterial.cpp

@@ -6,9 +6,14 @@
 #include "SimpleTexturedMaterial.hpp"
 #include "util/JSON.hpp"
 #include "asset/loader/TextureLoader.hpp"
+#include "asset/loader/ShaderLoader.hpp"
 
 using namespace Dawn;
 
+void SimpleTexturedMaterial::initShaderPrograms() {
+  this->shader = getGame()->assetManager->get<ShaderLoader>("shaders/hello-world.slang")->getShader();
+}
+
 void SimpleTexturedMaterial::load(std::shared_ptr<SceneLoadContext> ctx) {
   if(ctx->data.contains("color")) {
     this->setColor(JSON::color(ctx->data["color"]));
@@ -27,13 +32,13 @@ struct Color SimpleTexturedMaterial::getColor() {
 }
 
 std::shared_ptr<Texture> SimpleTexturedMaterial::getTexture() {
-  return this->texture;
+  return this->data.texture;
 }
 
 void SimpleTexturedMaterial::setTexture(
   const std::shared_ptr<Texture> texture
 ) {
-  this->texture = texture;
+  this->data.texture = texture;
 }
 
 void SimpleTexturedMaterial::setColor(const struct Color color) {
@@ -59,10 +64,13 @@ std::vector<std::shared_ptr<RenderPass>> SimpleTexturedMaterial::getPasses(
   // }
 
   return {
-    // createRenderPass<SimpleTexturedShader, struct SimpleTexturedShaderData>(
+    std::make_shared<RenderPass>(
-    //   *this,
+      *this,
-    //   data,
+      nullptr,// Get mesh automatically.
-    //   textures
+      MeshDrawMode::TRIANGLES,// Move this later.
-    // )
+      0,// Move this later.
+      -1,// Move this later.
+      this->shader
+    )
   };
 }

src/dawn/component/display/material/SimpleTexturedMaterial.hpp

@@ -15,14 +15,16 @@ namespace Dawn {
     glm::mat4 projection;
     glm::mat4 view;
     bool hasTexture;
+    std::shared_ptr<Texture> texture;
   };
 
   class SimpleTexturedMaterial : public Material {
     private:
       struct SimpleTexturedMaterialShaderData data;
-      std::shared_ptr<Texture> texture;
+      std::shared_ptr<ShaderProgram> shader;
 
     protected:
+      void initShaderPrograms() override;
 
     public:
       void load(std::shared_ptr<SceneLoadContext> ctx) override;

src/dawn/display/pass/RenderPass.cpp

@@ -13,12 +13,14 @@ RenderPass::RenderPass(
   const std::shared_ptr<Mesh> mesh,
   const enum MeshDrawMode drawMode,
   const int32_t indiceStart,
-  const int32_t indiceCount
+  const int32_t indiceCount,
+  const std::shared_ptr<ShaderProgram> shaderProgram
 ) :
   mesh(mesh),
   drawMode(drawMode),
   indiceStart(indiceStart),
-  indiceCount(indiceCount)
+  indiceCount(indiceCount),
+  shaderProgram(shaderProgram)
 {
   // Need mesh?
   if(!this->mesh) {
@@ -28,5 +30,9 @@ RenderPass::RenderPass(
 }
 
 void RenderPass::draw() {
-  mesh->draw(drawMode, indiceStart, indiceCount);
+  // mesh->draw(drawMode, indiceStart, indiceCount);
+}
+
+RenderPass::~RenderPass() {
+  
 }

src/dawn/display/pass/RenderPass.hpp

@@ -6,11 +6,13 @@
 #pragma once
 #include "display/mesh/Mesh.hpp"
 #include "scene/SceneComponent.hpp"
+#include "display/shader/ShaderProgram.hpp"
 
 namespace Dawn {
   class RenderPass {
     private:
       std::shared_ptr<Mesh> mesh;
+      std::shared_ptr<ShaderProgram> shaderProgram;
       const enum MeshDrawMode drawMode;
       const int32_t indiceStart;
       const int32_t indiceCount;
@@ -20,18 +22,21 @@ namespace Dawn {
        * Constructs a new RenderPass.
        * 
        * @param self Self component instance that is creating this render pass.
-       * @param d The data to use for this render pass.
        * @param mesh The mesh to use for this render pass.
        * @param drawMode The draw mode to use for this render pass.
        * @param indiceStart The indice to start drawing from.
        * @param indiceCount The number of indices to draw.
+       * @param shaderProgram The shader program to use for this render pass.
        */
       RenderPass(
         SceneComponent &self,
+
         const std::shared_ptr<Mesh> mesh,
         const enum MeshDrawMode drawMode,
         const int32_t indiceStart,
-        const int32_t indiceCount
+        const int32_t indiceCount,
+        
+        const std::shared_ptr<ShaderProgram> shaderProgram
       );
 
       /**

src/dawn/display/shader/IShaderProgram.hpp

@@ -14,13 +14,22 @@ namespace Dawn {
 
     public:
       /**
-       * Initialize the IShaderProgram2 object
+       * Initialize the ShaderProgram. In your render hosts' implementation
+       * this would initialize the shader on your GPU and ideally set the
+       * initial values for uniforms and objects.
        * 
-       * @param stages The list of shader stages to initialize with.
+       * Provided stages will already be "initialized" (at least as far as the
+       * engine is concerned), and should be ready to be used. If your render
+       * host needs the program to be initialized prior to the stages you will
+       * need to modify how stages are initialized, this is by design as we are
+       * loading the shader code and "initializing" the stages before we create
+       * and initialize the program which will use and link the stages.
+       * 
+       * @param stages The stages to use in this program.
        */
       virtual void init(
         const std::vector<std::shared_ptr<ShaderStage>> &stages
-      ) = 0;
+      );
 
       /**
        * Destroy the IShaderProgram2 object

src/dawn/display/shader/ShaderManagerSlangFileSystem.cpp

@@ -46,7 +46,6 @@ SlangResult ShaderManagerSlangFileSystem::loadFile(
   
   if(!String::endsWith(path, ".slang")) return SLANG_E_NOT_FOUND;
 
-  std::cout << "Loading: " << path << std::endl;
   auto loader = shaderManager->getGame()->assetManager->get<StringLoader>(path);
   loader->loadImmediately();
 
@@ -54,7 +53,6 @@ SlangResult ShaderManagerSlangFileSystem::loadFile(
   blob->str = loader->data;
   *outBlob = blob;
 
-  std::cout << "Loaded: " << path << std::endl;
   return SLANG_OK;
 }
 

src/dawnopengl/display/shader/ShaderProgram.cpp

@@ -4,14 +4,54 @@
 // https://opensource.org/licenses/MIT
 
 #include "ShaderProgram.hpp"
+#include "assert/assert.hpp"
+#include "assert/assertgl.hpp"
+
 
 using namespace Dawn;
 
 void ShaderProgram::init(
   const std::vector<std::shared_ptr<ShaderStage>> &stages
 ) {
+  assertTrue(this->id == -1, "ShaderProgram already initialized?");
+
   IShaderProgram::init(stages);
+
+  // Create the program
+  this->id = glCreateProgram();
+  assertNoGLError();
+
+  // Attach all the shader stages
+  for(auto stage : stages) {
+    glAttachShader(this->id, stage->id);
+    assertNoGLError();
+  }
+
+  // Link and verify the program
+  glLinkProgram(this->id);
+  assertNoGLError();
+
+  GLint status;
+  glGetProgramiv(this->id, GL_LINK_STATUS, &status);
+  assertNoGLError();
+
+  if(!status) {
+    // Failed to link
+    GLint logLength;
+    glGetProgramiv(this->id, GL_INFO_LOG_LENGTH, &logLength);
+    assertNoGLError();
+
+    GLchar *log = new GLchar[logLength];
+    glGetProgramInfoLog(this->id, logLength, NULL, log);
+    assertNoGLError();
+    assertUnreachable("Failed to link shader program:\n%s", log);
+  }
 }
 
 ShaderProgram::~ShaderProgram() {
+  // Delete the shader program
+  if(this->id != -1) {
+    glDeleteProgram(this->id);
+    assertNoGLError();
+  }
 }

src/dawnopengl/display/shader/ShaderProgram.hpp

@@ -5,9 +5,13 @@
 
 #pragma once
 #include "display/shader/IShaderProgram.hpp"
+#include "dawnopengl.hpp"
 
 namespace Dawn {
   class ShaderProgram : public IShaderProgram {
+    private:
+      GLuint id = -1;
+
     public:
       void init(
         const std::vector<std::shared_ptr<ShaderStage>> &stages

src/dawnopengl/display/shader/ShaderStage.cpp

@@ -4,6 +4,8 @@
 // https://opensource.org/licenses/MIT
 
 #include "ShaderStage.hpp"
+#include "assert/assert.hpp"
+#include "assert/assertgl.hpp"
 
 using namespace Dawn;
 
@@ -11,7 +13,56 @@ void ShaderStage::init(
   const SlangStage &stage,
   const std::string &code
 ) {
+  assertTrue(this->id == -1, "ShaderStage already initialized?");
+
+  // Determine GL Shader type from slang shader type.
+  switch(stage) {
+    case SlangStage::SLANG_STAGE_VERTEX:
+      shaderType = GL_VERTEX_SHADER;
+      break;
+
+    case SlangStage::SLANG_STAGE_FRAGMENT:
+      shaderType = GL_FRAGMENT_SHADER;
+      break;
+
+    default:
+      assertUnreachable("Unknown Slang Shader type\n");
+      break;
+  }
+
+  // Initialize the shader.
+  this->id = glCreateShader(shaderType);
+  assertNoGLError();
+
+  // Compile
+  const char_t* cSource = code.c_str();
+  glShaderSource(this->id, 1, &cSource, nullptr);
+  assertNoGLError();
+
+  glCompileShader(this->id);
+  assertNoGLError();
+
+  // Validate shader compiled successfully.
+  GLint status;
+  glGetShaderiv(this->id, GL_COMPILE_STATUS, &status);
+  assertNoGLError();
+
+  if(!status) {
+    // Failed to compile
+    GLint logLength;
+    glGetShaderiv(this->id, GL_INFO_LOG_LENGTH, &logLength);
+    assertNoGLError();
+
+    GLchar *log = new GLchar[logLength];
+    glGetShaderInfoLog(this->id, logLength, NULL, log);
+    assertNoGLError();
+    assertUnreachable("Failed to compile shader stage %i:\n%s", shaderType, log);
+  }
 }
 
 ShaderStage::~ShaderStage() {
+  if(this->id != -1) {
+    glDeleteShader(this->id);
+    assertNoGLError();
+  }
 }

src/dawnopengl/display/shader/ShaderStage.hpp

@@ -5,14 +5,24 @@
 
 #pragma once
 #include "display/shader/IShaderStage.hpp"
+#include "dawnopengl.hpp"
 
 namespace Dawn {
+  class ShaderProgram;
+
   class ShaderStage : public IShaderStage {
+    protected:
+      GLenum shaderType;
+      GLuint id = -1;
+
     public:
       void init(
         const SlangStage &stage,
         const std::string &code
       ) override;
+      
       ~ShaderStage();
+      
+      friend class ShaderProgram;
   };
 }

src/dawnrpg/game/Game.cpp

@@ -5,11 +5,9 @@
 
 #include "Game.hpp"
 #include "component/SceneComponentRegistry.hpp"
-
 #include "component/RPGEntity.hpp"
 #include "component/RPGPlayer.hpp"
 #include "component/RPGMap.hpp"
-#include "asset/loader/ShaderLoader.hpp"
 
 using namespace Dawn;
 
@@ -26,9 +24,6 @@ std::string Game::getInitialScene() {
 void Game::initManagers() {
   this->rpgManager = std::make_shared<RPGManager>();
   this->rpgManager->init(shared_from_this());
-
-  auto sl = assetManager->get<ShaderLoader>("shaders/hello-world.slang");
-  sl->loadImmediately();
 }
 
 Game::~Game() {