OPENGL 4.3 SUPPORT IS REQUIRED CODE
OPENGL 4.3 SUPPORT IS REQUIRED SERIES

OPENGL 4.3 SUPPORT IS REQUIRED CODE

The complete source code for this example is available at: Most of the rendering function is just setting uniform variables and could be replaced with the use of a uniform buffer. GlDrawArrays( GL_PATCHES, 0, m_patchCount )

Shader->setUniformValue( " material.shininess", 10.0f ) Shader->setUniformValue( " material.Ks" ,

Shader->setUniformValue( " material.Kd" , Shader->setUniformValue( " material.Ka" , Shader->setUniformValue( " light.intensity" , Shader->setUniformValue( " light.position", lightDirection ) QVector4D lightDirection = worldToEyeNormal * worldLightDirection QMatrix4x4 worldToEyeNormal( normalMatrix ) QVector4D worldLightDirection( sinf( m_sunTheta * degToRad ), Shader->setUniformValue( " mvp", mvp ) Shader->setUniformValue( " normalMatrix", normalMatrix ) Shader->setUniformValue( " worldNormalMatrix", worldNormalMatrix ) Shader->setUniformValue( " modelViewMatrix", modelViewMatrix ) Shader->setUniformValue( " modelMatrix", m_modelMatrix ) QMatrix4x4 mvp = m_camera->projectionMatrix() * modelViewMatrix QMatrix3x3 normalMatrix = modelViewMatrix.normalMatrix() QMatrix3x3 worldNormalMatrix = m_modelMatrix.normalMatrix() QMatrix4x4 modelViewMatrix = viewMatrix * m_modelMatrix QMatrix4x4 viewMatrix = m_camera->viewMatrix() Pass in the usual transformation matrices Shader->setUniformValue( " verticalScale", m_verticalScale ) Shader->setUniformValue( " horizontalScale", m_horizontalScale ) Set the horizontal and vertical scales applied Set the fragment shader display mode subroutine QOpenGLShaderProgramPtr shader = m_material->shader() GlClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) In fact the entire rendering function for this example is: void TerrainTessellationScene::render()

Texture blending controlled by terrain height, slope, and fragment distanceДЄs you can see this is quite some features but we have moved much work to the GPU.

GLSL subroutines to quickly change rendering style without changing shader program.

Wireframe included in single pass using geometry shader.

Dynamic tessellation levels determined by screen-space error.View frustum clipping performed on GPU (needs improvement to remove artifacts).Rendered with GL_PATCHES as we are using tessellation shaders.Terrain heightmap texture used to render large terrain region in just one function call!.This gives a small taste of what can easily be done using these two great APIs together: An exampleДЇor now here is a video of an example written using Qt 5.1 (dev branch) and OpenGL. If all goes to plan then Qt3D will be released along with Qt 5.2. Although not part of the Qt3D module, the improvements described here form a good part of the foundations upon which we will build the Qt3D renderer. I know many people have been asking about the status of Qt3D. We are very keen to see OpenGL support in Qt continue to improve and will continue to work to do so.

Some of the items on the radar include Textures, Texture Images, Samplers, Occlusion Queries, Transform feedback objects, Uniform Buffer Objects, Shader Storage Buffer Objects and Shader Program Pipeline Objects, Object labels for debug output There is still much to do and we will continue adding more enablers to make it easier and safer to write OpenGL code as we move towards Qt 5.2. For the futureДЄs we have seen, Qt 5.1 adds a great deal new functionality and enablers around OpenGL. The availability of Geometry, Tessellation stage and Compute shaders really opens the doors for some interesting effects and order of magnitude improvements in performance over what is possible with plain OpenGL 2.x. Tessellation Control and Tessellation Evaluation Shaders (requires OpenGL 4.0)ДЄs long as your platform has support for the required OpenGL version, then Qt 5.1 will work there.Qt 5.1 will include support for all shader stages supported by OpenGL: In Qt 5.0 the QOpenGLShader and QOpenGLShaderProgram classes only had support for Vertex and Fragment shaders.

OPENGL 4.3 SUPPORT IS REQUIRED SERIES

Earlier articles in this series are available at: This article concludes our series on what is new in Qt 5.1 with respect to OpenGL.

Opengl 4.3 support is required