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basic circle function to be used as base for torus

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Liv 2017-05-25 15:32:49 -07:00
parent fee26c3976
commit 10408a0fe4
1 changed files with 36 additions and 4 deletions
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40
libraries/render-utils/src/GeometryCache.cpp
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@ -332,6 +332,39 @@ void extrudePolygon(GeometryCache::ShapeData& shapeData, gpu::BufferPointer& ver
shapeData.setupIndices(indexBuffer, solidIndices, wireIndices); shapeData.setupIndices(indexBuffer, solidIndices, wireIndices);
} }
void drawCircle(GeometryCache::ShapeData& shapeData, gpu::BufferPointer& vertexBuffer, gpu::BufferPointer& indexBuffer) {
// Draw a circle with radius 1/4th the size of the bounding box
using namespace geometry;
Index baseVertex = (Index)(vertexBuffer->getSize() / SHAPE_VERTEX_STRIDE);
VertexVector vertices;
IndexVector solidIndices, wireIndices;
std::vector<vec3> shape = polygon<64>();
for (const vec3& v : shape) {
vertices.push_back(vec3(v.x, 0, v.z));
vertices.push_back(vec3(0, 0, 0));
}
for (uint32_t i = 2; i < 64; ++i) {
solidIndices.push_back(baseVertex + 0);
solidIndices.push_back(baseVertex + i);
solidIndices.push_back(baseVertex + i - 1);
solidIndices.push_back(baseVertex + 64);
solidIndices.push_back(baseVertex + i + 64 - 1);
solidIndices.push_back(baseVertex + i + 64);
}
for (uint32_t i = 1; i <= 64; ++i) {
wireIndices.push_back(baseVertex + (i % 64));
wireIndices.push_back(baseVertex + i - 1);
wireIndices.push_back(baseVertex + (i % 64) + 64);
wireIndices.push_back(baseVertex + (i - 1) + 64);
}
shapeData.setupVertices(vertexBuffer, vertices);
shapeData.setupIndices(indexBuffer, solidIndices, wireIndices);
}
// FIXME solids need per-face vertices, but smooth shaded // FIXME solids need per-face vertices, but smooth shaded
// components do not. Find a way to support using draw elements // components do not. Find a way to support using draw elements
// or draw arrays as appropriate // or draw arrays as appropriate
@ -384,13 +417,12 @@ void GeometryCache::buildShapes() {
extrudePolygon<64>(_shapes[Cylinder], _shapeVertices, _shapeIndices); extrudePolygon<64>(_shapes[Cylinder], _shapeVertices, _shapeIndices);
//Cone, //Cone,
extrudePolygon<64>(_shapes[Cone], _shapeVertices, _shapeIndices, true); extrudePolygon<64>(_shapes[Cone], _shapeVertices, _shapeIndices, true);
//Circle
drawCircle(_shapes[Circle], _shapeVertices, _shapeIndices);
// Not implememented yet: // Not implememented yet:
//Quad, //Quad,
//Circle, //Circle,
//Torus, //Torus,
} }
gpu::Stream::FormatPointer& getSolidStreamFormat() { gpu::Stream::FormatPointer& getSolidStreamFormat() {