OpenGL with Qt 5. Qt Developer Days, Berlin Presented by Sean Harmer. Produced by Klarälvdalens Datakonsult AB
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1 Qt Developer Days, Berlin 2012 Presented by Sean Harmer Produced by Klarälvdalens Datakonsult AB Material based on Qt 5.0, created on November 9, 2012
2 QtQuick 2 and OpenGL The Future Module: 2/18
3 QtQuick 2 and OpenGL The Future Module: 3/18
4 What is OpenGL? Family of APIs for 2D and 3D rendering Very flexible Massive computational power Industry standard Cross-platform Actively developed Extensible What is OpenGL? 4/18
5 What is it used for? What is OpenGL used/good for? Computer Aided Design Content creation Data visualisation Games Image processing Simulation 5/18
6 Hello Triangle Example Application setup Window creation Context creation Build an OpenGL pipeline Prepare geometry Feed data Ḍemo opengl/shader-fundamentals/ex_basic_usage 6/18
7 Simplified OpenGL Pipeline 7/18
8 Application Tasks Create window and OpenGL context Create per-vertex data Configure OpenGL state Create shader programs Create Vertex Buffer Objects (VBOs)... Create the pipeline and configure it Kickoff the drawing! Update AI, physics, application state, make coffee... 8/18
9 Shader Interfaces cont'd. 9/18
10 Shaders can have constant variables: const float pi = ; const vec2 resolution = vec2( , ); VBOs can hold per-vertex attributes: Varying Degrees of Change m_colors.create(); m_colors.setusagepattern( QOpenGLBuffer::StaticDraw ); m_colors.bind(); m_colors.allocate( colordata, 3 * 3 * sizeof( float ) ); What about in between these extremes? Ḍemo opengl/shader-fundamentals/ex_shader_uniform 10/18
11 Gui vs Widgets QOpenGL* vs QGL* Rule of thumb: Prefer QOpenGL* 11/18
12 Summary OpenGL windows and contexts Pipeline is programmable via shaders Shaders are compiled and linked Use Vertex Buffer Objects (VBOs) for speed Enable VBOs to match Vertex Shader interface Draw with gldrawarrays() or gldrawelements() Shader programs are configurable via uniform variables 12/18
13 QtQuick 2 and OpenGL The Future Module: QtQuick 2 and OpenGL 13/18
14 QtQuick 2 built on top of OpenGL renderer QDeclarativeView (QQ1) QQuickView (QQ2) Much in common... Can we integrate it? Several approaches OpenGL underlay OpenGL overlay Framebuffer Objects Custom QtQuick2 Items ShaderEffect item QtQuick 2 and OpenGL Ḍemo opengl/qtquick2-integration/ex_basic_integration Ḍemo opengl/qtquick2-integration/ex_updates QtQuick 2 and OpenGL 14/18
15 QtQuick 2/OpenGL Integration Don't clear! Receive notification Borrow the QtQuick2 OpenGL context Set state and draw stuff Reset state Return context in condition we found it No Vertex Buffer Objects bound No Index Buffer bound No Shader Program bound Restore texture unit configuration Don't forget sampler objects! QtQuick 2 and OpenGL 15/18
16 QtQuick 2 built on OpenGL 2.x (or OpenGL ES 2) Must be compatible with QtQuick 2's needs Compatibility Profile QSurfaceFormat and QWindow::setFormat() Same rules apply Now we can take advantage of new features! Export objects/types to QML Using a Custom Context Ḍemo opengl/qtquick2-integration/ex_custom_context Ḍemo opengl/qtquick2-integration/ex_qq2ui Ḍemo opengl/qtquick2-integration/ex_qq2ui_uniforms QtQuick 2 and OpenGL 16/18
17 QtQuick 2 and OpenGL The Future Module: The Future 17/18
18 Version functions and extensions Vertex Array Objects (VAOs) Transform feedback objects Texture/Sampler objects Geometry, Tessellation, and Compute Shader support Atomic counters, fences Query objects - timing, occlusion Debugging/profiling support... Qt 5.1 and Beyond The Future 18/18
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