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vbo.cpp
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vbo.cpp
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/*
* vbo.cpp
* lorenz
*
* Created by McK on 10/02/10.
* Copyright 2010 __MyCompanyName__. All rights reserved.
*
*/
#include <stdio.h>
#ifdef __APPLE__
#include <OpenGL/gl.h>
#elif __linux__
#define GL_GLEXT_PROTOTYPES 1
#define GL3_PROTOTYPES 1
#include <GL/glu.h>
#include <GL/glext.h>
#endif
#include "vbo.h"
GLuint vboId=0;
void createVBO(int size) {
destroyVBO();
glGenBuffersARB(1, &vboId);
printf("BUFFERID: %d\n", vboId);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, vboId);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, size*sizeof(Vertex), 0, GL_STATIC_COPY_ARB);
}
void updateVBO(Vertex *verts, int numvers) {
createVBO(numvers);
glBufferDataARB(GL_ARRAY_BUFFER_ARB, numvers*sizeof(Vertex), 0, GL_STATIC_COPY_ARB);
glBufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, numvers*sizeof(Vertex), verts);
}
void destroyVBO() {
if(vboId) {
glDeleteBuffersARB(1, &vboId);
}
vboId = 0;
}
void drawVBO(int start, int numvers, int line) {
glBindBufferARB(GL_ARRAY_BUFFER_ARB, vboId);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, sizeof(Vertex), 0);
glColorPointer(4, GL_FLOAT, sizeof(Vertex), (char *)(3*sizeof(float)));
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glHint (GL_LINE_SMOOTH_HINT, GL_NICEST);
glEnable (GL_BLEND);
glEnable(GL_ALPHA);
if(line==0) {
glDrawArrays(GL_TRIANGLE_STRIP, start, numvers);
} else if(line==1){
glEnable(GL_POINT_SMOOTH);
glPointSize(5.0);
glDrawArrays(GL_POINTS, start, numvers);
glPointSize(1.0);
} else if(line==2){
glLineWidth(3.0f);
glDrawArrays(GL_LINE_STRIP, start, numvers);
glLineWidth(1.0f);
}else{
glDrawArrays(GL_LINES, start, numvers);
}
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
}
void drawVBOComponents(int start, int numvers) {
glBindBufferARB(GL_ARRAY_BUFFER_ARB, vboId);
Vertex *verts = (Vertex *)glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_READ_ONLY_ARB);
double t = 0;
double step = 60.0/(numvers);
glColor4f(1.0, 1.0, 1.0, 1.0);
glBegin(GL_LINE_STRIP);
glVertex3d(0.0, 0.0, 0.0);
glVertex3d(60.0, 0.0, 0.0);
glEnd();
glBegin(GL_LINE_STRIP);
for(int i=start; i<(numvers+start);i++) {
//glColor4f(verts[i].colour[0], verts[i].colour[1], verts[i].colour[2], 1.0);
glColor4f(1.0, 0.0, 0.0, 1.0);
glVertex3d(t, verts[i].position[0]/4, 0);
t+=step;
}
glEnd();
glTranslated(0, -10, 0);
t=0;
glColor4f(1.0, 1.0, 1.0, 1.0);
glBegin(GL_LINE_STRIP);
glVertex3d(0.0, 0.0, 0.0);
glVertex3d(60.0, 0.0, 0.0);
glEnd();
glBegin(GL_LINE_STRIP);
for(int i=start; i<(numvers+start);i++) {
//glColor4f(verts[i].colour[0], verts[i].colour[1], verts[i].colour[2], 1.0);
glColor4f(0.0, 1.0, 0.0, 1.0);
glVertex3d(t, verts[i].position[1]/4, 0);
t+=step;
}
glEnd();
glTranslated(0, -20, 0);
t=0;
glColor4f(1.0, 1.0, 1.0, 1.0);
glBegin(GL_LINE_STRIP);
glVertex3d(0.0, 0.0, 0.0);
glVertex3d(60.0, 0.0, 0.0);
glEnd();
glBegin(GL_LINE_STRIP);
for(int i=start; i<(numvers+start);i++) {
//glColor4f(verts[i].colour[0], verts[i].colour[1], verts[i].colour[2], 1.0);
glColor4f(0.0, 0.0, 1.0, 1.0);
glVertex3d(t, verts[i].position[2]/4, 0);
t+=step;
}
glEnd();
glUnmapBuffer(GL_ARRAY_BUFFER_ARB);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
}