Could anyone figure out what is wrong with the code supplied below and why my floating-point texture doesn’t work. Running this simple program only shows a plain white quad. I have tried everything I can come up with but this problem beats me. I have a ATI mobility Radeon X600 graphics card (if that helps).
Thanks!
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <GL/glew.h>
#include <gl/glu.h>
#include <gl/glut.h>
using namespace std;
GLuint tex;
int texSize = 2;
float* data = (float*)malloc(4*texSize*texSize*sizeof(float));
void update(void)
{
glutPostRedisplay();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB,tex);
glBegin(GL_TRIANGLES);
glTexCoord2d(0.0, 0.0);
glVertex3d(-0.5, -0.5, 0.0);
glTexCoord2d(1.0, 0.0);
glVertex3d(0.5, -0.5, 0.0);
glTexCoord2d(1.0, 1.0);
glVertex3d(0.5, 0.5, 0.0);
glTexCoord2d(0.0, 0.0);
glVertex3d(-0.5, -0.5, 0.0);
glTexCoord2d(1.0, 1.0);
glVertex3d(0.5, 0.5, 0.0);
glTexCoord2d(0.0, 1.0);
glVertex3d(-0.5, 0.5, 0.0);
glEnd();
glutSwapBuffers();
glDisable(GL_TEXTURE_RECTANGLE_ARB);
}
void reshape(int w, int h)
{
}
void createTextures()
{
for (int i=0; i<texSize*texSize*4; i++)
data[i] = i+1.0;
glGenTextures (1, &tex);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, tex);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB,0,GL_RGBA32F_ARB,
texSize,texSize,0,GL_RGBA, GL_FLOAT, data);
}
void keyboard(unsigned char key, int x, int y)
{}
void main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode( GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(400, 400);
glutInitWindowPosition(100, 100);
glutCreateWindow("OpenGL Test 1.0");
glewInit();
createTextures();
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutIdleFunc(update);
glutMainLoop();
}