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render_particles.cpp
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render_particles.cpp
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/*
* Copyright 1993-2010 NVIDIA Corporation. All rights reserved.
*
* Please refer to the NVIDIA end user license agreement (EULA) associated
* with this source code for terms and conditions that govern your use of
* this software. Any use, reproduction, disclosure, or distribution of
* this software and related documentation outside the terms of the EULA
* is strictly prohibited.
*
*/
#include <GL/glew.h>
#include <math.h>
#include <assert.h>
#include <stdio.h>
#include "render_particles.h"
#include "shaders.h"
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif
ParticleRenderer::ParticleRenderer()
: m_pos(0),
m_numParticles(0),
m_pointSize(1.0f),
m_particleRadius(0.125f * 0.5f),
m_program(0),
m_vbo(0),
m_colorVBO(0)
{
_initGL();
}
ParticleRenderer::~ParticleRenderer()
{
m_pos = 0;
}
void ParticleRenderer::setPositions(float *pos, int numParticles)
{
m_pos = pos;
m_numParticles = numParticles;
}
void ParticleRenderer::setVertexBuffer(unsigned int vbo, int numParticles)
{
m_vbo = vbo;
m_numParticles = numParticles;
}
void ParticleRenderer::_drawPoints()
{
if (!m_vbo)
{
glBegin(GL_POINTS);
{
int k = 0;
for (int i = 0; i < m_numParticles; ++i)
{
glVertex3fv(&m_pos[k]);
k += 4;
}
}
glEnd();
}
else
{
glBindBufferARB(GL_ARRAY_BUFFER_ARB, m_vbo);
glVertexPointer(4, GL_FLOAT, 0, 0);
glEnableClientState(GL_VERTEX_ARRAY);
if (m_colorVBO) {
glBindBufferARB(GL_ARRAY_BUFFER_ARB, m_colorVBO);
glColorPointer(4, GL_FLOAT, 0, 0);
glEnableClientState(GL_COLOR_ARRAY);
}
glDrawArrays(GL_POINTS, 0, m_numParticles);
glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
}
void ParticleRenderer::display(DisplayMode mode /* = PARTICLE_POINTS */)
{
switch (mode)
{
case PARTICLE_POINTS:
glColor3f(1, 1, 1);
glPointSize(m_pointSize);
_drawPoints();
break;
default:
case PARTICLE_SPHERES:
glEnable(GL_POINT_SPRITE_ARB);
glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, GL_TRUE);
glEnable(GL_VERTEX_PROGRAM_POINT_SIZE_NV);
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
glUseProgram(m_program);
glUniform1f( glGetUniformLocation(m_program, "pointScale"), m_window_h / tanf(m_fov*0.5f*(float)M_PI/180.0f) );
glUniform1f( glGetUniformLocation(m_program, "pointRadius"), m_particleRadius );
glColor3f(1, 1, 1);
_drawPoints();
glUseProgram(0);
glDisable(GL_POINT_SPRITE_ARB);
break;
}
}
GLuint
ParticleRenderer::_compileProgram(const char *vsource, const char *fsource)
{
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vertexShader, 1, &vsource, 0);
glShaderSource(fragmentShader, 1, &fsource, 0);
glCompileShader(vertexShader);
glCompileShader(fragmentShader);
GLuint program = glCreateProgram();
glAttachShader(program, vertexShader);
glAttachShader(program, fragmentShader);
glLinkProgram(program);
// check if program linked
GLint success = 0;
glGetProgramiv(program, GL_LINK_STATUS, &success);
if (!success) {
char temp[256];
glGetProgramInfoLog(program, 256, 0, temp);
printf("Failed to link program:\n%s\n", temp);
glDeleteProgram(program);
program = 0;
}
return program;
}
void ParticleRenderer::_initGL()
{
m_program = _compileProgram(vertexShader, spherePixelShader);
#if !defined(__APPLE__) && !defined(MACOSX)
glClampColorARB(GL_CLAMP_VERTEX_COLOR_ARB, GL_FALSE);
glClampColorARB(GL_CLAMP_FRAGMENT_COLOR_ARB, GL_FALSE);
#endif
}