Qt3D Renderer Submission: Difference between revisions

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=Qt3D Renderer Submission=
[[Category:Developing_with_Qt::Qt3D]]<br />[toc align_right=&quot;yes&amp;quot; depth=&quot;3&amp;quot;]


==OpenGL Rendering==
= Qt3D Renderer Submission =


The actual OpenGL Rendering takes place in the RenderThread context.<br /> The thread is woken up when a RenderQueue is completed.
== OpenGL Rendering ==
 
The actual OpenGL Rendering takes place in the RenderThread context.<br />The thread is woken up when a RenderQueue is completed.


The rendering goes as follow :
The rendering goes as follow :
Line 12: Line 14:
** Clear the scene
** Clear the scene
** For each RenderCommand in the RenderView
** For each RenderCommand in the RenderView
*** Create and bind the RenderCommand’s <span class="caps">VAO</span> if it doesn’t already exists for a given MeshData
*** Create and bind the RenderCommand's VAO if it doesn't already exists for a given MeshData
*** Bind the OpenGLProgram to use for the given Material/RenderPass/Technique
*** Bind the OpenGLProgram to use for the given Material/RenderPass/Technique
*** Set the attributes
*** Set the attributes
*** Release the <span class="caps">VAO</span>
*** Release the VAO
*** Set the DrawState to be used for the current Material/RenderPass/Technique
*** Set the DrawState to be used for the current Material/RenderPass/Technique
*** Set the Mesh matrix
*** Set the Mesh matrix
*** Set the Mesh Material
*** Set the Mesh Material
*** Set the uniforms for the given Material
*** Set the uniforms for the given Material
*** Bind the <span class="caps">VAO</span>
*** Bind the VAO
*** OpenGL draw call
*** OpenGL draw call
*** Release and Destroy <span class="caps">VAO</span>
*** Release and Destroy VAO
 
There is room for quite a few improvements here. That includes, sorting RenderCommands by Shader, OpenGL states and Uniform bindings. Later on we will also focus on OpenGL 4 features such as Indirect drawing commands.This will be done in the course of the following weeks and documented.
 
===Categories:===
 
* [[:Category:Developing with Qt|Developing_with_Qt]]
** [[:Category:Developing with Qt::Qt3D|Qt3D]]

Revision as of 10:14, 24 February 2015


[toc align_right="yes&quot; depth="3&quot;]

Qt3D Renderer Submission

OpenGL Rendering

The actual OpenGL Rendering takes place in the RenderThread context.
The thread is woken up when a RenderQueue is completed.

The rendering goes as follow :

  • For each RenderView in the Frame queue
    • Set the Viewport
    • Set the Camera
    • Clear the scene
    • For each RenderCommand in the RenderView
      • Create and bind the RenderCommand's VAO if it doesn't already exists for a given MeshData
      • Bind the OpenGLProgram to use for the given Material/RenderPass/Technique
      • Set the attributes
      • Release the VAO
      • Set the DrawState to be used for the current Material/RenderPass/Technique
      • Set the Mesh matrix
      • Set the Mesh Material
      • Set the uniforms for the given Material
      • Bind the VAO
      • OpenGL draw call
      • Release and Destroy VAO
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