Mali GPU User Interface Engine Application Development Guide

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Tutorial on Drawing 3D Shapesfloat nDotL = max(dot(normal, lightVector), 0.0);vec3 diffuse = DIFFUSE_LIGHT * nDotL;float specPow = 0.0;if (nDotL > 0.0) // are there any specular reflections?{vec3 cameraVector = normalize(vCameraVector);// calculate how much specular light will be reflectedvec3 reflectVector = reflect(-cameraVector, normal);specPow = pow(max(dot(reflectVector, lightVector), 0.0), 4.0);}// calculate the specular light based on the light value and the reflection valuevec3 specular = SPECULAR_LIGHT * specPow;}// sum all of the light sources togethergl_FragColor = vec4(AMBIENT_LIGHT, 1.0) * color +vec4(diffuse, 1.0) * color +vec4(specular, 1.0);7. Example 4-37 shows setting the light and position values and passing them to the shaders:Example 4-37 Set the camera, projection, view, and world...float cameraAngle = 0.0f;vec3 camPos = calculateCamPos(75.0f, cameraAngle);vec3 camTarget = vec3(0.0f, 0.0f, 0.0f);vec3 upVector = vec3(0.0f, 0.0f, 1.0f);// Set up the view, projection and world matrices and multiply them to get the// modelviewprojection and modelview matrices.mat4 view = mat4::lookAt(camPos, camTarget, upVector);mat4 proj = mat4::perspective(60.0f, 4.0f/3.0f, 1.0f, 500.0f);mat4 world = mat4::identity();mat4 wvpMatrix = proj * view * world;vec3 lightPosition(75.0f, 75.0f, 0.0f);// Set the program to use and initialize the uniformscontext->setProgram(perVertexLightingProgram);context->setUniform("LIGHT_POSITION", lightPosition);context->setUniform("CAMERA_POSITION", camPos);context->setUniform("AMBIENT_LIGHT", AMBIENT_LIGHT);context->setUniform("DIFFUSE_LIGHT", DIFFUSE_LIGHT);context->setUniform("SPECULAR_LIGHT", SPECULAR_LIGHT);context->setUniformSampler("diffuseTexture", diffuseTexture);context->setUniformSampler("normalMap", normalMap);...// Enable depth test and start drawing loopglEnable(GL_DEPTH_TEST);8. Example 4-38 on page 4-29 shows the part of the draw loop that reacts to keyboard inputto change the camera, view, and lighting:ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-28ID070710Non-Confidential - Draft - Beta
Tutorial on Drawing 3D ShapesExample 4-38 Use the to keyboard input to change the view, camera, and lighting......do{// Exit the application if the escape key is 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(75.0f, --cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){camPos = calculateCamPos(75.0f, ++cameraAngle);view = mat4::lookAt(camPos, camTarget, upVector);}}else{if (keyboard->getSpecialKeyState(Keyboard::KEY_RIGHT)){world *= mat4::rotation(1.0f, vec3(0.0f, 0.0f, 1.0f));}if (keyboard->getSpecialKeyState(Keyboard::KEY_LEFT)){world *= mat4::rotation(-1.0f, vec3(0.0f, 0.0f, 1.0f));}}9. Example 4-39 shows the part of the draw loop that sets the uniform values and draws theteapot:Example 4-39 Drawing the bump-mapped object...wvpMatrix = proj * view * world;context->setUniformMatrix("WORLD_VIEW_PROJECTION", wvpMatrix);context->setUniformMatrix("WORLD", world.toMat3());// Clear the screen and draw teapot with lightingglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );teapot->draw();}while ( context->update() );}catch (Exception &e){ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 4-29ID070710Non-Confidential - Draft - Beta
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MaliGPU User Interface EngineVersio
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ContentsMali GPU User Interface Eng
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List of TablesMali GPU User Interfa
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List of FiguresFigure 4-17 Environm
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PrefaceAbout this bookThis is the M
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PrefaceFeedbackARM welcomes feedbac
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Introduction1.1 About the Mali GPU
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IntroductionProxygetLoader()LoaderA
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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
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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
Page 54 and 55: Tutorial on Drawing 3D Shapes...0.5
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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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