Stuff I've fixed so far.

src/dawnopengl/display/RenderManager.cpp

@@ -14,13 +14,12 @@ RenderManager::RenderManager(DawnGame *game) :
   backBuffer(*this),
   renderPipeline(this)
 {
-  this->simpleShader = new SimpleTexturedShader();
   this->uiShader = new UIShader();
 }
 
 void RenderManager::init() {
   this->renderPipeline.init();
-  this->simpleShader->compile();
+  this->simpleShader.compile();
   this->uiShader->compile();
 
   // Prepare the initial values
@@ -38,10 +37,6 @@ RenderPipeline * RenderManager::getRenderPipeline() {
   return &this->renderPipeline;
 }
 
-Shader * RenderManager::getDefaultShader() {
-  return this->simpleShader;
-}
-
 UIShader * RenderManager::getUIShader() {
   return this->uiShader;
 }
@@ -67,6 +62,5 @@ void RenderManager::update() {
 }
 
 RenderManager::~RenderManager() {
-  delete this->simpleShader;
   delete this->uiShader;
 }

src/dawnopengl/display/RenderManager.hpp

@@ -16,7 +16,7 @@ namespace Dawn {
 
     public:
       BackBufferRenderTarget backBuffer;
-      SimpleTexturedShader *simpleShader;
+      SimpleTexturedShader simpleShader;
       UIShader *uiShader;
 
       /**
@@ -26,7 +26,6 @@ namespace Dawn {
       
       RenderTarget * getBackBuffer() override;
       RenderPipeline * getRenderPipeline() override;
-      Shader * getDefaultShader() override;
       UIShader * getUIShader() override;
       void setRenderFlags(renderflag_t renderFlags) override;
       void init() override;

src/dawnopengl/display/shader/SimpleTexturedShader.cpp

@@ -0,0 +1,43 @@
+// Copyright (c) 2023 Dominic Masters
+// 
+// This software is released under the MIT License.
+// https://opensource.org/licenses/MIT
+
+#include "SimpleTexturedShader.hpp"
+
+using namespace Dawn;
+
+void SimpleTexturedShader::compile() {
+  this->program.compile();
+}
+
+std::vector<struct ShaderPass> SimpleTexturedShader::getItemPasses(
+  MeshRenderer *mesh, Material *material
+) {
+  SimpleTexturedMaterial *simpleMaterial = dynamic_cast<SimpleTexturedMaterial*>(material);
+  assertNotNull(simpleMaterial);
+
+  struct ShaderPass onlyPass;
+  onlyPass.shaderProgram = &program;
+  onlyPass.colorValues[program.paramColor] = simpleMaterial->color;
+  onlyPass.matrixValues[program.paramModel] = mesh->transform->getWorldTransform();
+
+  if(simpleMaterial->texture != nullptr) {
+    onlyPass.boolValues[program.paramHasTexture] = true;
+    onlyPass.textureSlots[0] = simpleMaterial->texture;
+    onlyPass.textureValues[program.paramTexture] = 0;
+  } else {
+    onlyPass.boolValues[program.paramHasTexture] = false;
+  }
+
+  std::vector<struct ShaderPass> passes;
+  passes.push_back(onlyPass);
+  return passes;
+}
+
+void SimpleTexturedShader::setGlobalParameters(
+  glm::mat4 cameraProjection, glm::mat4 cameraView
+) {
+  this->program.setMatrix(this->program.paramProjection, cameraProjection);
+  this->program.setMatrix(this->program.paramView, cameraView);
+}

src/dawnopengl/display/shader/SimpleTexturedShader.hpp

@@ -6,6 +6,7 @@
 #pragma once
 #include "display/shader/Shader.hpp"
 #include "SimpleTexturedShaderProgram.hpp"
+#include "scene/components/display/material/SimpleTexturedMaterial.hpp"
 
 namespace Dawn {
   class SimpleTexturedShader : public Shader {
@@ -13,21 +14,14 @@ namespace Dawn {
       SimpleTexturedShaderProgram program;
 
     public:
-      void compile() override {
-        this->program.compile();
-      }
+      void compile() override;
 
       std::vector<struct ShaderPass> getItemPasses(
-        MeshRenderer *mesh,
-        Material *material
-      ) override {
-        return std::vector<struct ShaderPass>();
-      }
+        MeshRenderer *mesh, Material *material
+      ) override;
 
       void setGlobalParameters(
-        glm::mat4 cameraProjection,
-        glm::mat4 cameraView
-      ) override {
-      }
+        glm::mat4 cameraProjection, glm::mat4 cameraView
+      ) override;
   };
 }

src/dawnopengl/scene/components/display/material/SimpleTexturedMaterial.cpp

@@ -4,6 +4,7 @@
 // https://opensource.org/licenses/MIT
 
 #include "SimpleTexturedMaterial.hpp"
+#include "game/DawnGame.hpp"
 
 using namespace Dawn;
 
@@ -13,5 +14,5 @@ SimpleTexturedMaterial::SimpleTexturedMaterial(SceneItem *i) :
 }
 
 Shader * SimpleTexturedMaterial::getShader() {
-  return this->shader;
+  return &this->getGame()->renderManager.simpleShader;
 }

src/dawnopengl/scene/components/display/material/SimpleTexturedMaterial.hpp

@@ -4,13 +4,11 @@
 // https://opensource.org/licenses/MIT
 
 #pragma once
-#include "display/shader/SimpleTexturedShader.hpp"
 #include "scene/components/display/Material.hpp"
 
 namespace Dawn {
   class SimpleTexturedMaterial : public Material {
     public:
-      SimpleTexturedShader *shader = nullptr;
       Texture *texture = nullptr;
       struct Color color = COLOR_WHITE;