Mali GPU User Interface Engine Application Development Guide

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Tutorial on Drawing 2D Shapes6. The coordinate and color information are associated with new buffers as shown inExample 3-5:Example 3-5 Creating vertex and color buffers for the triangle...Managed vertexBuffer = context->createBuffer(GL_ARRAY_BUFFER, sizeof(vertexData),sizeof(GLfloat)*2);vertexBuffer->setData(0, sizeof(vertexData), vertexData);Managed colorBuffer = context->createBuffer(GL_ARRAY_BUFFER, sizeof(colorData),sizeof(GLubyte)*4);colorBuffer->setData(0, sizeof(colorData), colorData);VertexElement elements[2];elements[0].components = 2;elements[0].offset = 0;elements[0].semantic = POSITION;elements[0].stream = 0;elements[0].type = GL_FLOAT;elements[0].normalize = false;elements[1].components = 4;elements[1].offset = 0;elements[1].semantic = COLOR;elements[1].stream = 1;elements[1].type = GL_UNSIGNED_BYTE;elements[1].normalize = true;...Managed vertexDeclaration = context->createVertexDeclaration(elements, 2);context->setVertexDeclaration(vertexDeclaration);There are several buffers created in Example 3-5:a. createBuffer() creates vertexBuffer and colorBuffer objects from vertexData andcolorDatab. A VertexElement array named elements is created. The array size is two becausethere are position and color attributes for each vertex.c. Each VertexElement object describes one vertex attribute. The values of the each ofthe elements[] attributes is initialized:• The first element has two components because each vertex specifies aposition in the XY plane. The type is GL_FLOAT because floating-point numbersspecify the position.• The second element has four components because it specifies a color. Thetype is GL_UNSIGNED_BYTE because, in this example, 8-bit numbers specify thecolor and alpha channel values.For more information on attributes, see Passing data as uniforms on page 6-7.d. A vertexDeclaration object is created from elements. There are two objects in theelements array.e. setVertexDeclaration() associates the new vertexDeclaration object with thecontext.7. The triangle has been specified, so it can be drawn as shown in Example 3-6 on page 3-5.ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-4ID070710Non-Confidential - Draft - Beta
Tutorial on Drawing 2D ShapesFor each iteration of the loop:a. The first element of the vertex buffer that is associated with context is set to thevertexBuffer object defined previously.b. The second element of the vertex buffer that is associated with context is set to thecolorBuffer object defined previously.c. drawArrays() uses the vertex buffer arrays to draw the first object:• The object to draw is GL_TRIANGLES so three vertices are used.• The second parameter is 0, so the vertices start from the beginning of thebuffer.• The third parameter specifies the primitiveCount. There is only one primitive,a triangle, so the value is 1.d. A test for the escape key provides a way to end the display.e. If the context window is closed, update() returns false and the do loop ends.Example 3-6 Using the vertex information to draw the triangle...do{context->setVertexBuffer(0, vertexBuffer);context->setVertexBuffer(1, colorBuffer);/* Draw indexed triangles using the first 3 vertices of the buffers */context->drawArrays(GL_TRIANGLES, 0, 1);...if(keyboard->getSpecialKeyState(Keyboard::KEY_ESCAPE)) break;} while( context->update() );8. All of the execution code was enclosed in one try catch block which ends with the codein Example 3-7. If there is an exception, a message is displayed in the system window.Example 3-7 Trapping an exception in the triangle example...}}catch(Exception& e){printf("MDE \n%s\n\n", e.getMessage().getCharString());}9. Figure 3-1 on page 3-6 shows the triangle:ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 3-5ID070710Non-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
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Page 36 and 37: Tutorial on Drawing 2D ShapesExampl
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Page 44 and 45: Tutorial on Drawing 3D Shapes4.1 Dr
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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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