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OpenGL sample now builds and displays a sphere volume.

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This commit is contained in:
David Williams 2008-06-11 21:32:03 +00:00
parent 350a7feef6
commit 2f5d9e5ab2
1 changed files with 64 additions and 15 deletions
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79
examples/OpenGL/main.cpp
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@ -1,5 +1,7 @@
#include "BlockVolume.h"
#include "BlockVolumeIterator.h"
#include "IndexedSurfacePatch.h"
#include "SurfaceExtractors.h"
#include "Utility.h"
#include <windows.h> // Standard Header For Most Programs
@ -12,9 +14,10 @@ using namespace PolyVox;
using namespace std;
//Global variables are easier for demonstration purposes, especially
//as I'm not sure if I can pass variables to the GLUT functions.
//as I'm not sure how/if I can pass variables to the GLUT functions.
const uint16_t g_uVolumeSideLength = 128;
BlockVolume<uint8_t> g_volData(logBase2(g_uVolumeSideLength)); //Creates a volume 128x128x128
IndexedSurfacePatch* g_ispRegionSurfaces[8][8][8];
void createSphereInVolume(void)
{
@ -31,14 +34,21 @@ void createSphereInVolume(void)
volIter.setPosition(static_cast<Vector3DInt16>(regWholeVolume.getLowerCorner()));
do
{
//Get our current position
const uint16_t uX = volIter.getPosX();
const uint16_t uY = volIter.getPosY();
const uint16_t uZ = volIter.getPosZ();
Vector3DFloat v3dPos(volIter.getPosX(), volIter.getPosY(), volIter.getPosZ());
Vector3DFloat v3dVolCenter(g_uVolumeSideLength / 2, g_uVolumeSideLength / 2, g_uVolumeSideLength / 2);
float fDistToCenter = (v3dPos - v3dVolCenter).length();
//The centre of the volume
const uint16_t uVolCenterX = g_uVolumeSideLength / 2;
}while (volIter.isValidForRegion()); //In our case this covers the whole volume
if(fDistToCenter <= 50.0f)
{
volIter.setVoxel(static_cast<uint8_t>(fDistToCenter));
}
else
{
volIter.setVoxel(0);
}
}while (volIter.moveForwardInRegionXYZ()); //In our case this covers the whole volume
}
void init ( GLvoid ) // Create Some Everyday Functions
@ -57,12 +67,26 @@ void display ( void ) // Create The Display Function
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
glLoadIdentity(); // Reset The Current Modelview Matrix
glTranslatef(0.0f,0.0f,-200.0f); // Move Right 3 Units
glBegin(GL_QUADS); // Draw A Quad
glVertex3f(0.0f, 0.0f, 0.0f); // Top Left
glVertex3f( 128.0f, 0.0f, 0.0f); // Top Right
glVertex3f( 128.0f, 128.0f, 0.0f); // Bottom Right
glVertex3f(0.0f, 128.0f, 0.0f); // Bottom Left
glTranslatef(-g_uVolumeSideLength/2,-g_uVolumeSideLength/2,-200.0f);
glBegin(GL_TRIANGLES);
for(uint16_t z = 0; z < 8; ++z)
{
for(uint16_t y = 0; y < 8; ++y)
{
for(uint16_t x = 0; x < 8; ++x)
{
const vector<SurfaceVertex>& vertices = g_ispRegionSurfaces[x][y][z]->getVertices();
const vector<uint32_t>& indices = g_ispRegionSurfaces[x][y][z]->getIndices();
for(vector<uint32_t>::const_iterator indexIter = indices.begin(); indexIter != indices.end(); ++indexIter)
{
const SurfaceVertex& vertex = vertices[*indexIter];
const Vector3DFloat& vertexPos = vertex.getPosition();
glVertex3f(vertexPos.getX() + (x*16), vertexPos.getY() + (y*16), vertexPos.getZ() + (z*16));
}
}
}
}
glEnd();
@ -110,16 +134,41 @@ void arrow_keys ( int a_keys, int x, int y ) // Create Special Function (requir
void main ( int argc, char** argv ) // Create Main Function For Bringing It All Together
{
createSphereInVolume();
for(uint16_t z = 0; z < 8; ++z)
{
for(uint16_t y = 0; y < 8; ++y)
{
for(uint16_t x = 0; x < 8; ++x)
{
g_ispRegionSurfaces[x][y][z] = new IndexedSurfacePatch(false);
generateReferenceMeshDataForRegion(&g_volData, Region(Vector3DInt32(x * 16, y * 16, z * 16), Vector3DInt32((x+1) * 16, (y+1) * 16, (z+1) * 16)), g_ispRegionSurfaces[x][y][z]);
}
}
}
glutInit ( &argc, argv ); // Erm Just Write It =)
init ();
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE ); // Display Mode
glutInitWindowSize ( 500, 500 ); // If glutFullScreen wasn't called this is the window size
glutCreateWindow ( "NeHe's OpenGL Framework" ); // Window Title (argv[0] for current directory as title)
glutFullScreen ( ); // Put Into Full Screen
//glutFullScreen ( ); // Put Into Full Screen
glutDisplayFunc ( display ); // Matching Earlier Functions To Their Counterparts
glutReshapeFunc ( reshape );
glutKeyboardFunc ( keyboard );
glutSpecialFunc ( arrow_keys );
glutMainLoop ( ); // Initialize The Main Loop
for(uint16_t z = 0; z < 8; ++z)
{
for(uint16_t y = 0; y < 8; ++y)
{
for(uint16_t x = 0; x < 8; ++x)
{
delete g_ispRegionSurfaces[x][y][z];
}
}
}
}