Mali GPU User Interface Engine Application Development Guide

Tutorial on the Lotion User Interface Classes}applyMaterial(b.material, context);if (useWireframe) {for (unsigned int j = 0; j < b.geometry->getVertexBufferCount(); j++){if (b.geometry->getVertexBuffer(j))context->setVertexBuffer(j, b.geometry->getVertexBuffer(j));}if (b.geometry->getVertexDeclaration())context->setVertexDeclaration(b.geometry-> getVertexDeclaration());if (b.geometry->getIndexBuffer())context->drawElements(GL_LINE_STRIP, 0,b.geometry->getPrimitiveCount() * 3,b.geometry->getIndexBuffer());}else{b.geometry->draw();}}}traverseDraw(node->getFirstChild(), context);5.4.4 Utility functions for lightingLightShow(), angles_for_lights(), and calculate_cyl_info() are identical to the original exceptfor the namespace.See Example 5-23:Example 5-23 Utility functions for lighting// same as original except now class methodfloat LightShow::fract(float v) {return v - floor(v);}// same as original except now class methodvec2 LightShow::angles_for_light(vec2 cyl_pos, float cyl_radius, vec2 light_position) {vec2 light_cyl = cyl_pos - light_position;float light_dist = light_cyl.length();float scale_factor = (0.5f / 3.141532f);float cyl_center_angle = atan2(light_cyl.y, light_cyl.x) * scale_factor;float cyl_radius_angle = sin(cyl_radius / light_dist) * scale_factor;return vec2(cyl_center_angle - cyl_radius_angle,cyl_center_angle + cyl_radius_angle);}vec3 LightShow::calculate_cyl_info(vec2 cyl_pos, float cyl_radius,vec2 light_position, float light_radius) {vec2 light_cyl = cyl_pos - light_position;vec2 light_sideway_vec = vec2(light_cyl.y, -light_cyl.x).normalized();float light_dist = light_cyl.length();}vec2 angles = angles_for_light(cyl_pos, cyl_radius, light_position);float offset = fract((angles.x + angles.y) / 2.0);float limit = 0.5 - fract(angles.y - offset);vec3 shadow_info(offset, light_dist, limit);return shadow_info;ARM DUI 0527A-02a Copyright © 2010 ARM. All rights reserved. 5-28ID070710Non-Confidential - Draft - Beta