Mali GPU User Interface Engine Application Development Guide

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Tutorial on Drawing 3D ShapesExample 4-4 Setting the hello_world projection...// The camera position, target and up vector for use when creating the view matrixfloat cameraAngle = 45.0f;vec3 camPos = calculateCamPos(4.0f, cameraAngle);vec3 camTarget = vec3(0.0f, 0.0f, 0.0f);vec3 upVector = vec3(0.0f, 1.0f, 0.0f);// Set up the view and projection matrices and multiply them to get the// modelviewprojection matrix.mat4 world = mat4::identity();mat4 proj = mat4::perspective(35.0f, 1.0f, 0.1f, 20.0f);mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 wvpMatrix = proj * view;...context->setProgram(helloWorldProgram);glEnable(GL_DEPTH_TEST);6. The do loop checks for keyboard input and either rotates the object or changes the cameraposition. See Example 4-5.Example 4-5 Processing hello_world input and changing the view...do{// Exit the application if escape pressedif (keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)){return 0;}// Rotate object or cameraif (keyboard->getSpecialKeyState(Keyboard::KEY_SPACE)){if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){camPos = calculateCamPos(4.0f, ++cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){camPos = calculateCamPos(4.0f, --cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}}else{if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){world *= mat4::rotation(1.0f, vec3(0.0f, 1.0f, 0.0f));}if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){world *= mat4::rotation(-1.0f, vec3(0.0f, 1.0f, 0.0f));ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-4ID070710Non-Confidential - Draft - Beta
Tutorial on Drawing 3D Shapes...}}7. The projection has been calculated based on the keyboard input and can be redrawn. SeeExample 4-6.Example 4-6 Redrawing the hello_world view...// Recalculate modelviewprojection matrix in case it has been altered (rotation)wvpMatrix = proj * view * world;context->setUniformMatrix("WORLD_VIEW_PROJECTION", wvpMatrix);glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);}// Draw the objectcontext->drawArrays(GL_TRIANGLE_STRIP, 0, 2);context->drawArrays(GL_TRIANGLE_STRIP, 4, 2);context->drawArrays(GL_TRIANGLE_STRIP, 8, 2);context->drawArrays(GL_TRIANGLE_STRIP, 12, 2);context->drawArrays(GL_TRIANGLE_STRIP, 16, 2);context->drawArrays(GL_TRIANGLE_STRIP, 20, 2);}while ( context->update() );}catch (Exception &e){printf(e.getMessage().getCharString());}8. Rebuild the project and run it. Figure 4-1 shows the shape:9. Press the left or right arrows and observe that the object rotates.Figure 4-1 The Hello World shape10. Press and hold the spacebar while pressing the left or right arrows and observe that thecamera position changes.ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-5ID070710Non-Confidential - Draft - Beta
Page 1 and 2: MaliGPU User Interface EngineVersio
Page 3 and 4: ContentsMali GPU User Interface Eng
Page 5 and 6: List of TablesMali GPU User Interfa
Page 7 and 8: List of FiguresFigure 4-17 Environm
Page 9 and 10: PrefaceAbout this bookThis is the M
Page 11 and 12: PrefaceFeedbackARM welcomes feedbac
Page 13 and 14: Introduction1.1 About the Mali GPU
Page 15 and 16: IntroductionProxygetLoader()LoaderA
Page 17 and 18: Chapter 2Tutorial on the System Cla
Page 19 and 20: Tutorial on the System Classes2.2 C
Page 21 and 22: Tutorial on the System ClassesFigur
Page 23 and 24: Tutorial on the System ClassesDrawi
Page 29 and 30: Chapter 3Tutorial on Drawing 2D Sha
Page 31 and 32: Tutorial on Drawing 2D Shapes...con
Page 33 and 34: Tutorial on Drawing 2D ShapesFor ea
Page 36 and 37: Tutorial on Drawing 2D ShapesExampl
Page 38 and 39: Tutorial on Drawing 2D Shapes...ele
Page 42 and 43: Tutorial on Drawing 2D ShapesFigure
Page 44 and 45: Tutorial on Drawing 3D Shapes4.1 Dr
Page 48 and 49: Tutorial on Drawing 3D Shapes4.2 Co
Page 50 and 51: Tutorial on Drawing 3D Shapes4.3 Te
Page 52 and 53: Tutorial on Drawing 3D Shapesvec3 c
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Tutorial on the Lotion User Interfa
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Chapter 6Tutorial on Constructing C
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Tutorial on Constructing Custom Sha
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Appendix AMatrix and Vector Operati
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Matrix and Vector Operationsmat4 pe
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GlossaryThis glossary describes som
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GlossaryShader LibraryVertex shader
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Mali GPU User Interface Engine Application Development Guide

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