Background test

src/dawn/display/RenderPipeline.cpp

@@ -126,10 +126,10 @@ void RenderPipeline::renderUI(
   
   // Clear / Bind / Update the render target.
   renderTarget->bind();
-  renderTarget->clear(
-    RENDER_TARGET_CLEAR_FLAG_DEPTH |
-    RENDER_TARGET_CLEAR_FLAG_COLOR
-  );
+  // renderTarget->clear(
+  //   RENDER_TARGET_CLEAR_FLAG_DEPTH |
+  //   RENDER_TARGET_CLEAR_FLAG_COLOR
+  // );
   this->renderManager->setRenderFlags(
     RENDER_MANAGER_RENDER_FLAG_BLEND
   );

src/dawn/display/Transform.cpp

@@ -5,6 +5,7 @@
 
 #include "Transform.hpp"
 #include "scene/SceneItem.hpp"
+#include "util/mathutils.hpp"
 
 using namespace Dawn;
 
@@ -69,6 +70,16 @@ void Transform::lookAt(glm::vec3 pos, glm::vec3 look, glm::vec3 up) {
   this->setWorldTransform(glm::lookAt(pos, look, up));
 }
 
+float_t Transform::lookAtPixelPerfect(
+  glm::vec3 position, glm::vec3 look, float_t viewportHeight, float_t fov
+) {
+  float_t z = (
+    tanf((mathDeg2Rad(180.0f) - fov) / 2.0f) *
+    (viewportHeight/2.0f)
+  );
+  this->lookAt(glm::vec3(position.x, position.y, position.z + z), look);
+  return z;
+}
 
 glm::vec3 Transform::getLocalPosition() {
   return this->localPosition;

src/dawn/display/Transform.hpp

@@ -60,6 +60,20 @@ namespace Dawn {
       void lookAt(glm::vec3 position, glm::vec3 look);
       void lookAt(glm::vec3 position, glm::vec3 look, glm::vec3 up);
 
+      /**
+       * Shorthand combined for lookAt and perspectivePixelPerfectDistance
+       * to allow you to create pixel perfect lookAt camera view matricies.
+       * 
+       * @param position Position of the camera. Z is for an offset.
+       * @param look Position in world space this transform looks at.
+       * @param viewportHeight Height of the viewport.
+       * @param fov Field of view (in radians).
+       * @return The Z distance that was calculated.
+       */
+      float_t lookAtPixelPerfect(
+        glm::vec3 position, glm::vec3 look, float_t viewportHeight, float_t fov
+      );
+
       /**
        * Returns the local position (position relative to "my parent").
        * @return The 3D local position in parent-relative space.