Showing the changes to interface/src/renderer/GeometryCache.cpp (1 of 5 files). Show all
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| 1 | +// | |
| 2 | +// GeometryCache.cpp | |
| 3 | +// interface | |
| 4 | +// | |
| 5 | +// Created by Andrzej Kapolka on 6/21/13. | |
| 6 | +// Copyright (c) 2013 High Fidelity, Inc. All rights reserved. | |
| 7 | + | |
| 8 | +#include <cmath> | |
| 9 | + | |
| 10 | +#include "GeometryCache.h" | |
| 11 | +#include "world.h" | |
| 12 | + | |
| 13 | +GeometryCache::~GeometryCache() { | |
| 14 | + foreach (const VerticesIndices& vbo, _hemisphereVBOs) { | |
| 15 | + glDeleteBuffers(1, &vbo.first); | |
| 16 | + glDeleteBuffers(1, &vbo.second); | |
| 17 | + } | |
| 18 | +} | |
| 19 | + | |
| 20 | +void GeometryCache::renderHemisphere(int slices, int stacks) { | |
| 21 | + VerticesIndices& vbo = _hemisphereVBOs[SlicesStacks(slices, stacks)]; | |
| 22 | + int vertices = slices * (stacks - 1) + 1; | |
| 23 | + int indices = slices * 2 * 3 * (stacks - 2) + slices * 3; | |
| 24 | + if (vbo.first == 0) { | |
| 25 | + GLfloat* vertexData = new GLfloat[vertices * 3]; | |
| 26 | + GLfloat* vertex = vertexData; | |
| 27 | + for (int i = 0; i < stacks - 1; i++) { | |
| 28 | + float phi = PIf * 0.5f * i / (stacks - 1), z, radius; | |
| 29 | + sincosf(phi, &z, &radius); | |
| 30 | + | |
| 31 | + for (int j = 0; j < slices; j++) { | |
| 32 | + float theta = PIf * 2.0f * j / slices; | |
| 33 | + float x, y; | |
| 34 | + sincosf(theta, &x, &y); | |
| 35 | + x *= radius; | |
| 36 | + y *= radius; | |
| 37 | + | |
| 38 | + *(vertex++) = x; | |
| 39 | + *(vertex++) = y; | |
| 40 | + *(vertex++) = z; | |
| 41 | + } | |
| 42 | + } | |
| 43 | + *(vertex++) = 0.0f; | |
| 44 | + *(vertex++) = 0.0f; | |
| 45 | + *(vertex++) = 1.0f; | |
| 46 | + | |
| 47 | + glGenBuffers(1, &vbo.first); | |
| 48 | + glBindBuffer(GL_ARRAY_BUFFER, vbo.first); | |
| 49 | + const int BYTES_PER_VERTEX = 3 * sizeof(GLfloat); | |
| 50 | + glBufferData(GL_ARRAY_BUFFER, vertices * BYTES_PER_VERTEX, vertexData, GL_STATIC_DRAW); | |
| 51 | + delete[] vertexData; | |
| 52 | + | |
| 53 | + GLushort* indexData = new GLushort[indices]; | |
| 54 | + GLushort* index = indexData; | |
| 55 | + for (int i = 0; i < stacks - 2; i++) { | |
| 56 | + GLushort bottom = i * slices; | |
| 57 | + GLushort top = bottom + slices; | |
| 58 | + for (int j = 0; j < slices; j++) { | |
| 59 | + int next = (j + 1) % slices; | |
| 60 | + | |
| 61 | + *(index++) = bottom + j; | |
| 62 | + *(index++) = top + next; | |
| 63 | + *(index++) = top + j; | |
| 64 | + | |
| 65 | + *(index++) = bottom + j; | |
| 66 | + *(index++) = bottom + next; | |
| 67 | + *(index++) = top + next; | |
| 68 | + } | |
| 69 | + } | |
| 70 | + GLushort bottom = (stacks - 2) * slices; | |
| 71 | + GLushort top = bottom + slices; | |
| 72 | + for (int i = 0; i < slices; i++) { | |
| 73 | + *(index++) = bottom + i; | |
| 74 | + *(index++) = bottom + (i + 1) % slices; | |
| 75 | + *(index++) = top; | |
| 76 | + } | |
| 77 | + | |
| 78 | + glGenBuffers(1, &vbo.second); | |
| 79 | + glBindBuffer(GL_ARRAY_BUFFER, vbo.second); | |
| 80 | + const int BYTES_PER_INDEX = sizeof(GLushort); | |
| 81 | + glBufferData(GL_ARRAY_BUFFER, indices * BYTES_PER_INDEX, indexData, GL_STATIC_DRAW); | |
| 82 | + delete[] indexData; | |
| 83 | + | |
| 84 | + } else { | |
| 85 | + glBindBuffer(GL_ARRAY_BUFFER, vbo.first); | |
| 86 | + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo.second); | |
| 87 | + } | |
| 88 | + glEnableClientState(GL_VERTEX_ARRAY); | |
| 89 | + glEnableClientState(GL_NORMAL_ARRAY); | |
| 90 | + | |
| 91 | + glVertexPointer(3, GL_FLOAT, 0, 0); | |
| 92 | + glNormalPointer(GL_FLOAT, 0, 0); | |
| 93 | + | |
| 94 | + glDrawRangeElementsEXT(GL_TRIANGLES, 0, vertices - 1, indices, GL_UNSIGNED_SHORT, 0); | |
| 95 | + | |
| 96 | + glDisableClientState(GL_VERTEX_ARRAY); | |
| 97 | + glDisableClientState(GL_NORMAL_ARRAY); | |
| 98 | + | |
| 99 | + glBindBuffer(GL_ARRAY_BUFFER, 0); | |
| 100 | + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); | |
| 101 | +} | |