Mirrors/overte
3
0
Fork 0
mirror of https://github.com/overte-org/overte.git synced 2025-08-04 19:10:01 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

Add untested renderHalfCylinder function to GeometryCache/

Browse source
This commit is contained in:
Mark Peng 2013-08-05 19:52:02 -07:00
parent d7dc07502c
commit 57efea40ee
2 changed files with 70 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

68
interface/src/renderer/GeometryCache.cpp
View file

@ -163,3 +163,71 @@ void GeometryCache::renderSquare(int xDivisions, int yDivisions) {
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}
void GeometryCache::renderHalfCylinder(int slices, int stacks, float radius, float height) {
VerticesIndices& vbo = _halfCylinderVBOs[IntPair(slices, stacks)];
int vertices = slices * (stacks - 1) + 1;
int indices = slices * 2 * 3 * (stacks - 2) + slices * 3;
if (vbo.first == 0) {
GLfloat* vertexData = new GLfloat[vertices * 3];
GLfloat* vertex = vertexData;
for (int i = 0; i < stacks; i++) {
float z = i * height / stacks;
for (int j = 0; j < slices; j++) {
float theta = PIf * j / slices;
*(vertex++) = sinf(theta) * radius;
*(vertex++) = cosf(theta) * radius;
*(vertex++) = z;
}
}
glGenBuffers(1, &vbo.first);
glBindBuffer(GL_ARRAY_BUFFER, vbo.first);
const int BYTES_PER_VERTEX = 3 * sizeof(GLfloat);
glBufferData(GL_ARRAY_BUFFER, vertices * BYTES_PER_VERTEX, vertexData, GL_STATIC_DRAW);
delete[] vertexData;
GLushort* indexData = new GLushort[indices];
GLushort* index = indexData;
for (int i = 0; i < stacks - 1; i++) {
GLushort bottom = i * slices;
GLushort top = bottom + slices;
for (int j = 0; j < slices; j++) {
int next = (j + 1) % slices;
*(index++) = bottom + j;
*(index++) = top + next;
*(index++) = top + j;
*(index++) = bottom + j;
*(index++) = bottom + next;
*(index++) = top + next;
}
}
glGenBuffers(1, &vbo.second);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo.second);
const int BYTES_PER_INDEX = sizeof(GLushort);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices * BYTES_PER_INDEX, indexData, GL_STATIC_DRAW);
delete[] indexData;
} else {
glBindBuffer(GL_ARRAY_BUFFER, vbo.first);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vbo.second);
}
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, 0);
glNormalPointer(GL_FLOAT, 0, 0);
glDrawRangeElementsEXT(GL_TRIANGLES, 0, vertices - 1, indices, GL_UNSIGNED_SHORT, 0);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
}

2
interface/src/renderer/GeometryCache.h
View file

@ -20,6 +20,7 @@ public:
void renderHemisphere(int slices, int stacks);
void renderSquare(int xDivisions, int yDivisions);
void renderHalfCylinder(int slices, int stacks, float radius, float height);
private:
@ -28,6 +29,7 @@ private:
QHash<IntPair, VerticesIndices> _hemisphereVBOs;
QHash<IntPair, VerticesIndices> _squareVBOs;
QHash<IntPair, VerticesIndices> _halfCylinderVBOs;
};
#endif /* defined(__interface__GeometryCache__) */