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Work on new OpenGL example - Work on immediate mode.

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This commit is contained in:
David Williams 2009-03-16 21:33:56 +00:00
parent 3e483c4355
commit 93e90b6031
1 changed files with 29 additions and 14 deletions
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43
examples/OpenGL/main.cpp
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@ -5,18 +5,18 @@
#include <windows.h> // Standard Header For Most Programs
//#define USE_OPENGL_IMMEDIATE_MODE
//#define USE_OPENGL_VERTEX_BUFFERS_OBJECTS
#ifdef USE_OPENGL_IMMEDIATE_MODE
#include <gl/gl.h>
#include <gl/glut.h>
#else
#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
#include <gl/glut.h> // The GL Utility Toolkit (Glut) Header]
#else
#include <gl/gl.h>
#include <gl/glut.h>
#endif
#include <iostream>
@ -27,17 +27,19 @@ 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
const uint16 g_uVolumeSideLength = 128;
const uint16 g_uVolumeSideLength = 256;
const uint16 g_uRegionSideLength = 16;
const uint16 g_uVolumeSideLengthInRegions = g_uVolumeSideLength / g_uRegionSideLength;
@ -52,9 +54,13 @@ int g_frameCounter = 0;
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
OpenGLSurfacePatch g_openGLSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
IndexedSurfacePatch* g_indexedSurfacePatches[g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions][g_uVolumeSideLengthInRegions];
#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;
@ -146,6 +152,7 @@ OpenGLSurfacePatch BuildOpenGLSurfacePatch(IndexedSurfacePatch& isp)
return result;
}
#endif
void createSphere(float fRadius, uint8 uValue)
{
@ -237,7 +244,8 @@ void display ( void ) // Create The Display Function
{
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{
/*glBindBuffer(GL_ARRAY_BUFFER, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].vertexBuffer);
#ifdef USE_OPENGL_VERTEX_BUFFERS_OBJECTS
glBindBuffer(GL_ARRAY_BUFFER, g_openGLSurfacePatches[uRegionX][uRegionY][uRegionZ].vertexBuffer);
glVertexPointer(3, GL_FLOAT, 36, 0);
glNormalPointer(GL_FLOAT, 36, (GLvoid*)12);
glColorPointer(3, GL_FLOAT, 36, (GLvoid*)24);
@ -252,8 +260,9 @@ void display ( void ) // Create The Display Function
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY); */
glDisableClientState(GL_VERTEX_ARRAY);
#else
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
const vector<SurfaceVertex>& vecVertices = ispCurrent->getVertices();
@ -311,6 +320,7 @@ void display ( void ) // Create The Display Function
}
glEnd();
#endif
}
}
}
@ -401,6 +411,7 @@ 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
#ifdef WIN32
//If we are on Windows we will need GLEW to access recent OpenGL functionality
GLenum err = glewInit();
@ -409,6 +420,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
/* Problem: glewInit failed, something is seriously wrong. */
cout << "Error: " << glewGetErrorString(err) << endl;
}
#endif
#endif
//Make our volume contain a sphere in the center.
@ -437,8 +449,7 @@ void main ( int argc, char** argv ) // Create Main Function For Bringing It Al
for(uint16 uRegionX = 0; uRegionX < g_uVolumeSideLengthInRegions; ++uRegionX)
{
//Create a new surface patch (which is basiaclly the PolyVox term for a mesh).
g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ] = new IndexedSurfacePatch();
IndexedSurfacePatch* ispCurrent = g_indexedSurfacePatches[uRegionX][uRegionY][uRegionZ];
IndexedSurfacePatch* ispCurrent = new IndexedSurfacePatch();
//Compute the extents of the current region
//FIXME - This is a little complex? PolyVox could
@ -457,7 +468,11 @@ 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
//delete ispCurrent;
}