Stuff I've fixed so far.

src/dawn/display/RenderPipeline.cpp

@@ -78,7 +78,7 @@ void RenderPipeline::renderSceneCamera(Scene *scene, Camera *camera) {
 
   // Create a new render ID. Long story short this is a really dirty way of 
   // not sending parameters to shaders more than we need.
-  this->renderId++;
+  this->renderId--;
 
   // Get the list of things to render first.
   std::vector<struct RenderPipelineItem> pipelineItems;
@@ -106,6 +106,9 @@ void RenderPipeline::renderSceneCamera(Scene *scene, Camera *camera) {
       item.mesh = mesh;
       item.pass = *itPass;
 
+      // Validate the pass
+      assertNotNull(item.pass.shaderProgram);
+
       // Do we need to get the W Vector?
       if(item.pass.needsW) {
         assertUnreachable();// TODO: Add distance from camera for W vector.
@@ -169,13 +172,16 @@ void RenderPipeline::renderSceneCamera(Scene *scene, Camera *camera) {
 
     // Bind the program.
     if(boundProgram != item.pass.shaderProgram) {
-      boundProgram->bind();
       boundProgram = item.pass.shaderProgram;
+      boundProgram->bind();
     }
 
     // Bind the textures to the slots
     auto itTextureSlot = item.pass.textureSlots.begin();
     while(itTextureSlot != item.pass.textureSlots.end()) {
+      // Assert texture isn't null, just don't include it.
+      assertNotNull(itTextureSlot->second);
+
       if(boundTextures[itTextureSlot->first] != itTextureSlot->second) {
         itTextureSlot->second->bind(itTextureSlot->first);
         boundTextures[itTextureSlot->first] = itTextureSlot->second;

src/dawn/display/RenderPipeline.hpp

@@ -22,7 +22,7 @@ namespace Dawn {
 
   class RenderPipeline {
     private:
-      int_fast16_t renderId;
+      int_fast16_t renderId = -1;
 
     public:
       RenderManager *renderManager;

src/dawn/display/_RenderManager.hpp

@@ -52,14 +52,6 @@ namespace Dawn {
        */
       virtual RenderPipeline * getRenderPipeline() = 0;
 
-      /**
-       * Returns the default shader, the default shader will be applied to the
-       * materials first.
-       * 
-       * @return Reference to the default shader.
-       */
-      virtual Shader * getDefaultShader() = 0;
-
       /**
        * Returns the UI Shader used by the game's UI engine.
        * 

src/dawn/display/shader/Shader.hpp

@@ -11,9 +11,9 @@ namespace Dawn {
   class Material;
 
   struct ShaderPass {
-    ShaderProgram *shaderProgram;
-    int32_t orderShader;
-    bool_t needsW;
+    ShaderProgram *shaderProgram = nullptr;
+    int32_t orderShader = 0;
+    bool_t needsW = false;
     
     // Parameters
     std::map<shaderparameter_t, struct Color> colorValues;
@@ -29,7 +29,7 @@ namespace Dawn {
 
   class Shader {
     public:
-      int_fast16_t renderId;
+      int_fast16_t renderId = 0;
 
       /**
        * Compile all programs for this shader. This amy not remain forever as I