/* GL_ARB_fragment_program texture test */ #include <assert.h> #include <string.h> #include <stdio.h> #include <stdlib.h> #include <math.h> #include <GL/glew.h> #include <GL/glut.h> #include "readtex.c" #define TEXTURE_FILE "../images/girl.rgb" static GLfloat Xrot = 0.0, Yrot = 0.0, Zrot = 0.0; static void Display( void ) { glClear( GL_COLOR_BUFFER_BIT ); glPushMatrix(); glRotatef(Xrot, 1.0, 0.0, 0.0); glRotatef(Yrot, 0.0, 1.0, 0.0); glRotatef(Zrot, 0.0, 0.0, 1.0); glBegin(GL_POLYGON); #define Q 2 glColor4f(1.0, 1.0, 1.0, 1); glTexCoord4f(0, 0, 0, Q); glVertex2f(-1, -1); glColor4f(0.2, 0.2, 1.0, 1); glTexCoord4f(1, 0, 0, Q); glVertex2f( 1, -1); glColor4f(0.2, 1.0, 0.2, 1); glTexCoord4f(1, 1, 0, Q); glVertex2f( 1, 1); glColor4f(1.0, 0.2, 0.2, 1); glTexCoord4f(0, 1, 0, Q); glVertex2f(-1, 1); glEnd(); glPopMatrix(); glutSwapBuffers(); } static void Reshape( int width, int height ) { glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glTranslatef( 0.0, 0.0, -8.0 ); } static void SpecialKey( int key, int x, int y ) { float step = 3.0; (void) x; (void) y; switch (key) { case GLUT_KEY_UP: Xrot += step; break; case GLUT_KEY_DOWN: Xrot -= step; break; case GLUT_KEY_LEFT: Yrot += step; break; case GLUT_KEY_RIGHT: Yrot -= step; break; } glutPostRedisplay(); } static void Key( unsigned char key, int x, int y ) { (void) x; (void) y; switch (key) { case 27: exit(0); break; } glutPostRedisplay(); } static void Init( void ) { static const char *modulate2D = "!!ARBfp1.0\n" "TEMP R0;\n" "TEX R0, fragment.texcoord[0], texture[0], 2D; \n" "MUL result.color, R0, fragment.color; \n" "END" ; GLuint modulateProg; GLuint Texture; if (!glutExtensionSupported("GL_ARB_fragment_program")) { printf("Error: GL_ARB_fragment_program not supported!\n"); exit(1); } printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); /* Setup the fragment program */ glGenProgramsARB(1, &modulateProg); glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg); glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, strlen(modulate2D), (const GLubyte *)modulate2D); printf("glGetError = 0x%x\n", (int) glGetError()); printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n", (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB)); assert(glIsProgramARB(modulateProg)); glEnable(GL_FRAGMENT_PROGRAM_ARB); /* Load texture */ glGenTextures(1, &Texture); glBindTexture(GL_TEXTURE_2D, Texture); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); if (!LoadRGBMipmaps(TEXTURE_FILE, GL_RGB)) { printf("Error: couldn't load texture image file %s\n", TEXTURE_FILE); exit(1); } /* XXX this enable shouldn't really be needed!!! */ glEnable(GL_TEXTURE_2D); glClearColor(.3, .3, .3, 0); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowPosition( 0, 0 ); glutInitWindowSize( 250, 250 ); glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH ); glutCreateWindow(argv[0]); glewInit(); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutSpecialFunc( SpecialKey ); glutDisplayFunc( Display ); Init(); glutMainLoop(); return 0; }