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Work on new OpenGL example - Splitting into several files.

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This commit is contained in:
David Williams
2009-03-18 21:10:51 +00:00
parent a50bb8413e
commit bd5acdb4cd
8 changed files with 229 additions and 190 deletions
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218
examples/OpenGL/main.cpp
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@@ -3,41 +3,28 @@
#include "PolyVoxCore/SurfaceExtractors.h"
#include "PolyVoxCore/Utility.h"
#include "OpenGLImmediateModeSupport.h"
#include "OpenGLVertexBufferObjectSupport.h"
#include "Shapes.h"
#include <windows.h> // Standard Header For Most Programs
#define USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#ifdef WIN32
#include "glew/glew.h"
#else
#include <gl/gl.h> // The GL Header File
#endif
#include <gl/glut.h> // The GL Utility Toolkit (Glut) Header]
#ifdef WIN32
#include "glew/glew.h"
#else
#include <gl/gl.h>
#include <gl/glut.h>
#include <gl/gl.h> // The GL Header File
#endif
#include <gl/glut.h> // The GL Utility Toolkit (Glut) Header]
#include <iostream>
//Some namespaces we need
using namespace std;
using namespace PolyVox;
using namespace std;
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
struct OpenGLSurfacePatch
{
GLulong noOfIndices;
GLuint indexBuffer;
GLuint vertexBuffer;
};
#endif
//Global variables are easier for demonstration purposes, especially
//as I'm not sure how/if I can pass variables to the GLUT functions.
//Global variables are denoted by the 'g_' prefix
@@ -52,111 +39,14 @@ int g_yOld = 0;
int g_frameCounter = 0;
bool g_bUseOpenGLVertexBufferObjects;
//Creates a volume 128x128x128
BlockVolume<uint8> g_volData(logBase2(g_uVolumeSideLength));
//Rather than storing one big mesh, the volume is broken into regions and a mesh is stored for each region
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
OpenGLSurfacePatch g_openGLSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
#else
IndexedSurfacePatch* g_indexedSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
#endif
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
OpenGLSurfacePatch BuildOpenGLSurfacePatch(IndexedSurfacePatch& isp)
{
OpenGLSurfacePatch result;
const vector<SurfaceVertex>& vecVertices = isp.getVertices();
const vector<uint32>& vecIndices = isp.getIndices();
glGenBuffers(1, &result.indexBuffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, result.indexBuffer);
int s = vecIndices.size() * sizeof(GLint);
if(s != 0)
{
GLvoid* blah = (GLvoid*)(&(vecIndices[0]));
glBufferData(GL_ELEMENT_ARRAY_BUFFER, s, blah, GL_STATIC_DRAW);
}
result.noOfIndices = vecIndices.size();
glGenBuffers(1, &result.vertexBuffer);
glBindBuffer(GL_ARRAY_BUFFER, result.vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, vecVertices.size() * sizeof(GLfloat) * 9, 0, GL_STATIC_DRAW);
GLfloat* ptr = (GLfloat*)glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
for(vector<SurfaceVertex>::const_iterator iterVertex = vecVertices.begin(); iterVertex != vecVertices.end(); ++iterVertex)
{
const SurfaceVertex& vertex = *iterVertex;
const Vector3DFloat& v3dVertexPos = vertex.getPosition();
//const Vector3DFloat v3dRegionOffset(uRegionX * g_uRegionSideLength, uRegionY * g_uRegionSideLength, uRegionZ * g_uRegionSideLength);
const Vector3DFloat v3dFinalVertexPos = v3dVertexPos + static_cast<Vector3DFloat>(isp.m_v3dRegionPosition);
*ptr = v3dFinalVertexPos.getX();
ptr++;
*ptr = v3dFinalVertexPos.getY();
ptr++;
*ptr = v3dFinalVertexPos.getZ();
ptr++;
*ptr = vertex.getNormal().getX();
ptr++;
*ptr = vertex.getNormal().getY();
ptr++;
*ptr = vertex.getNormal().getZ();
ptr++;
GLfloat red = 0.0f;
GLfloat green = 0.0f;
GLfloat blue = 0.0f;
uint8 material = vertex.getMaterial() + 0.5;
switch(material)
{
case 1:
red = 1.0;
green = 0.0;
blue = 0.0;
break;
case 2:
red = 0.0;
green = 1.0;
blue = 0.0;
break;
case 3:
red = 0.0;
green = 0.0;
blue = 1.0;
break;
case 4:
red = 1.0;
green = 1.0;
blue = 0.0;
break;
case 5:
red = 1.0;
green = 0.0;
blue = 1.0;
break;
}
*ptr = red;
ptr++;
*ptr = green;
ptr++;
*ptr = blue;
ptr++;
}
glUnmapBuffer(GL_ARRAY_BUFFER);
return result;
}
#endif
OpenGLSurfacePatch g_openGLSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
IndexedSurfacePatch* g_indexedSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
void timerFunc(int value)
{
@@ -205,7 +95,8 @@ void display ( void ) // Create The Display Function
{
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
if(g_bUseOpenGLVertexBufferObjects)
{
glBindBuffer(GL_ARRAY_BUFFER, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].vertexBuffer);
glVertexPointer(3, GL_FLOAT, 36, 0);
glNormalPointer(GL_FLOAT, 36, (GLvoid*)12);
@@ -222,67 +113,13 @@ void display ( void ) // Create The Display Function
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
#else
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
const vector<SurfaceVertex>& vecVertices = ispCurrent->getVertices();
const vector<uint32>& vecIndices = ispCurrent->getIndices();
glBegin(GL_TRIANGLES);
for(vector<uint32>::const_iterator iterIndex = vecIndices.begin(); iterIndex != vecIndices.end(); ++iterIndex)
{
const SurfaceVertex& vertex = vecVertices[*iterIndex];
const Vector3DFloat& v3dVertexPos = vertex.getPosition();
//const Vector3DFloat v3dRegionOffset(uRegionX * g_uRegionSideLength, uRegionY * g_uRegionSideLength, uRegionZ * g_uRegionSideLength);
const Vector3DFloat v3dFinalVertexPos = v3dVertexPos + static_cast<Vector3DFloat>(ispCurrent->m_v3dRegionPosition);
GLfloat red = 0.0f;
GLfloat green = 0.0f;
GLfloat blue = 0.0f;
uint8 material = vertex.getMaterial() + 0.5;
switch(material)
{
case 1:
red = 1.0;
green = 0.0;
blue = 0.0;
break;
case 2:
red = 0.0;
green = 1.0;
blue = 0.0;
break;
case 3:
red = 0.0;
green = 0.0;
blue = 1.0;
break;
case 4:
red = 1.0;
green = 1.0;
blue = 0.0;
break;
case 5:
red = 1.0;
green = 0.0;
blue = 1.0;
break;
}
glColor3f(red, green, blue);
glNormal3f(vertex.getNormal().getX(), vertex.getNormal().getY(), vertex.getNormal().getZ());
glVertex3f(v3dFinalVertexPos.getX(), v3dFinalVertexPos.getY(), v3dFinalVertexPos.getZ());
}
glEnd();
#endif
else
{
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
renderRegion(*ispCurrent);
}
}
}
}
@@ -361,6 +198,7 @@ default:
void main ( int argc, char** argv ) // Create Main Function For Bringing It All Together
{
g_bUseOpenGLVertexBufferObjects = true;
glutInit ( &argc, argv ); // Erm Just Write It =)
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE ); // Display Mode
glutInitWindowSize ( 500, 500 ); // If glutFullScreen wasn't called this is the window size
@@ -373,7 +211,8 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
glutTimerFunc(1000, timerFunc, 0);
glutIdleFunc(idle);
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
if(g_bUseOpenGLVertexBufferObjects)
{
#ifdef WIN32
//If we are on Windows we will need GLEW to access recent OpenGL functionality
GLenum err = glewInit();
@@ -383,7 +222,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
cout << "Error: " << glewGetErrorString(err) << endl;
}
#endif
#endif
}
//Make our volume contain a sphere in the center.
uint16 minPos = 0;
@@ -430,12 +269,15 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
//Extract the surface for this region
extractReferenceSurface(&g_volData, Region(regLowerCorner, regUpperCorner), ispCurrent);
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ] = BuildOpenGLSurfacePatch(*ispCurrent);
#else
g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ] = ispCurrent;
#endif
if(g_bUseOpenGLVertexBufferObjects)
{
g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ] = BuildOpenGLSurfacePatch(*ispCurrent);
}
else
{
g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ] = ispCurrent;
}
//delete ispCurrent;
}
}