f1402849
 dmayerich
renewed commit
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#include <iostream>
#include <string>
#include "rtsCamera.h"
#include "rtsSourceCode.h"
#include "rts_glShaderProgram.h"
using namespace std;
#include <gl/glut.h>
class rts_glTrueEyes
{
static int glut_window;
static rts_glShaderProgram shader;
static string source_file;
static rtsCamera camera;
static int mouse_x;
static int mouse_y;
static float camera_pos[3];
static float volume_size[3];
static rts_glTextureMap volume;
static bool zooming;
static void DrawCube()
{
float sx = volume_size[0]/2;
float sy = volume_size[1]/2;
float sz = volume_size[2]/2;
float tx = volume_size[0]/2;
float ty = volume_size[1]/2;
float tz = volume_size[2]/2;
glBegin(GL_QUADS);
glTexCoord3f(-tx, -ty, -tz);
glVertex3f(-sx, -sy, -sz);
glTexCoord3f(-tx, ty, -tz);
glVertex3f(-sx, sy, -sz);
glTexCoord3f(tx, ty, -tz);
glVertex3f(sx, sy, -sz);
glTexCoord3f(tx, -ty, -tz);
glVertex3f(sx, -sy, -sz);
glTexCoord3f(-tx, -ty, tz);
glVertex3f(-sx, -sy, sz);
glTexCoord3f(-tx, ty, tz);
glVertex3f(-sx, sy, sz);
glTexCoord3f(tx, ty, tz);
glVertex3f(sx, sy, sz);
glTexCoord3f(tx, -ty, tz);
glVertex3f(sx, -sy, sz);
glTexCoord3f(-tx, -ty, -tz);
glVertex3f(-sx, -sy, -sz);
glTexCoord3f(-tx, -ty, tz);
glVertex3f(-sx, -sy, sz);
glTexCoord3f(tx, -ty, tz);
glVertex3f(sx, -sy, sz);
glTexCoord3f(tx, -ty, -tz);
glVertex3f(sx, -sy, -sz);
glTexCoord3f(-tx, ty, -tz);
glVertex3f(-sx, sy, -sz);
glTexCoord3f(-tx, ty, tz);
glVertex3f(-sx, sy, sz);
glTexCoord3f(tx, ty, tz);
glVertex3f(sx, sy, sz);
glTexCoord3f(tx, ty, -tz);
glVertex3f(sx, sy, -sz);
glTexCoord3f(-tx, -ty, -tz);
glVertex3f(-sx, -sy, -sz);
glTexCoord3f(-tx, -ty, tz);
glVertex3f(-sx, -sy, sz);
glTexCoord3f(-tx, ty, tz);
glVertex3f(-sx, sy, sz);
glTexCoord3f(-tx, ty, -tz);
glVertex3f(-sx, sy, -sz);
glTexCoord3f(tx, -ty, -tz);
glVertex3f(sx, -sy, -sz);
glTexCoord3f(tx, -ty, tz);
glVertex3f(sx, -sy, sz);
glTexCoord3f(tx, ty, tz);
glVertex3f(sx, sy, sz);
glTexCoord3f(tx, ty, -tz);
glVertex3f(sx, sy, -sz);
glEnd();
}
static void DisplayFunction()
{
//set up the viewport and projection
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glViewport(0, 0, glutGet(GLUT_WINDOW_WIDTH), glutGet(GLUT_WINDOW_HEIGHT));
float aspect_ratio = (float)glutGet(GLUT_WINDOW_WIDTH)/(float)glutGet(GLUT_WINDOW_HEIGHT);
gluPerspective(camera.getFOV(), aspect_ratio, 0.01, 10);
//clear the screen
glClear(GL_COLOR_BUFFER_BIT);
glClear(GL_DEPTH_BUFFER_BIT);
//set up the camera
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
point3D<float> pos = camera.getPosition();
vector3D<float> up = camera.getUp();
gluLookAt(pos.x, pos.y, pos.z, 0, 0, 0, up.x, up.y, up.z);
//draw a cube
glColor3f(1.0, 0.0, 0.0);
shader.UpdateGlobalUniforms();
shader.BeginProgram();
DrawCube();
shader.EndProgram();
glutSwapBuffers();
}
static void IdleFunction()
{
glutPostRedisplay();
}
static void MouseDrag(int x, int y)
{
int dx = x - mouse_x;
int dy = y - mouse_y;
if(zooming)
{
camera.Zoom(dy);
}
else
{
camera.OrbitFocus(-dx*0.01, dy*0.01);
point3D<float> pos = camera.getPosition();
camera_pos[0] = pos.x;
camera_pos[1] = pos.y;
camera_pos[2] = pos.z;
}
mouse_x = x;
mouse_y = y;
glutPostRedisplay();
}
static void MouseMove(int x, int y)
{
mouse_x = x;
mouse_y = y;
}
static void KeyPress(unsigned char key, int x, int y)
{
//reload the shader
if(key == 'r' || key == 'R')
{
UpdateShader();
}
}
static void MousePress(int button, int state, int x, int y)
{
if(state == GLUT_DOWN && button == GLUT_MIDDLE_BUTTON)
zooming = true;
else
zooming = false;
}
static void UpdateShader()
{
//load the source code
shader.Clean();
shader.AttachShader(GL_FRAGMENT_SHADER, source_file.c_str());
//compile the shader
shader.Compile();
shader.PrintLog();
shader.Link();
shader.PrintLog();
if(!shader.linked)
{
cout<<"Error linking shader."<<endl;
std::puts("Press any key to continue...");
std::getchar();
UpdateShader();
}
shader.PrintUniforms();
shader.AttachGlobalUniform("camera", &camera_pos);
shader.AttachGlobalUniform("volume_size", &volume_size);
shader.AttachTextureMap("volume", volume);
}
public:
void Begin();
void SetShader(string filename);
void SetVolume(unsigned char* bits, int sx, int sy, int sz, int channels);
void SetVolumeSize(float x, float y, float z);
void Initialize();
};
//static variables
rtsCamera rts_glTrueEyes::camera;
rts_glShaderProgram rts_glTrueEyes::shader;
int rts_glTrueEyes::glut_window;
int rts_glTrueEyes::mouse_x;
int rts_glTrueEyes::mouse_y;
float rts_glTrueEyes::camera_pos[3];
float rts_glTrueEyes::volume_size[3];
string rts_glTrueEyes::source_file;
rts_glTextureMap rts_glTrueEyes::volume;
bool rts_glTrueEyes::zooming;
void rts_glTrueEyes::Initialize()
{
//initialize OpenGL
glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
//create the GLUT window
glut_window = glutCreateWindow("True Eyes");
//initialize GLEW
GLenum err = glewInit();
if(err != GLEW_OK)
fprintf(stderr, "Error: %s\n", glewGetErrorString(err));
if (glewIsSupported("GL_VERSION_2_0"))
printf("Ready for OpenGL 2.0\n");
else {
printf("OpenGL 2.0 not supported\n");
//exit(1);
}
//set the function pointers
glutDisplayFunc(&rts_glTrueEyes::DisplayFunction);
glutIdleFunc(&rts_glTrueEyes::IdleFunction);
glutMotionFunc(&rts_glTrueEyes::MouseDrag);
glutMouseFunc(&rts_glTrueEyes::MousePress);
glutPassiveMotionFunc(&rts_glTrueEyes::MouseMove);
glutKeyboardFunc(&rts_glTrueEyes::KeyPress);
//set rendering parameters
glEnable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
//set up the camera
camera.setPosition(0, 0, -1.6);
camera_pos[0] = 0;
camera_pos[1] = 0;
camera_pos[2] = -1.6;
camera.LookAt(0.0, 0.0, 0.0);
camera.setFOV(60);
zooming = false;
}
void rts_glTrueEyes::Begin()
{
//start rendering
glutMainLoop();
}
void rts_glTrueEyes::SetShader(string filename)
{
source_file = filename;
UpdateShader();
}
void rts_glTrueEyes::SetVolumeSize(float x, float y, float z)
{
float max_edge = max(x, max(y, z));
volume_size[0] = x/max_edge;
volume_size[1] = y/max_edge;
volume_size[2] = z/max_edge;
}
void rts_glTrueEyes::SetVolume(unsigned char* bits, int sx, int sy, int sz, int channels)
{
if(channels == 1)
volume.Init(bits, GL_TEXTURE_3D, sx, sy, sz, 1, GL_LUMINANCE, GL_UNSIGNED_BYTE, GL_NEAREST);
else if(channels == 3)
volume.Init(bits, GL_TEXTURE_3D, sx, sy, sz, GL_RGB, GL_RGB, GL_UNSIGNED_BYTE, GL_NEAREST);
CHECK_OPENGL_ERROR
}
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