/* * Exercise the EXT_422_pixels extension, a less convenient * alternative to MESA_ycbcr_texture. Requires ARB_fragment_program * to perform the final YUV->RGB conversion. * * Brian Paul 13 September 2002 * Keith Whitwell 30 November 2004 */ #include <math.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #define GL_GLEXT_PROTOTYPES #include <GL/glut.h> #include <assert.h> #include "../util/readtex.c" /* I know, this is a hack. */ #define TEXTURE_FILE "../images/tile.rgb" static GLfloat Xrot = 0, Yrot = 0, Zrot = 0; static GLint ImgWidth, ImgHeight; static GLushort *ImageYUV = NULL; static const GLuint yuvObj = 100; static const GLuint rgbObj = 101; static void Init( int argc, char *argv[] ); static void DrawObject(void) { glBegin(GL_QUADS); glTexCoord2f(0, 0); glVertex2f(-1.0, -1.0); glTexCoord2f(1, 0); glVertex2f(1.0, -1.0); glTexCoord2f(1, 1); glVertex2f(1.0, 1.0); glTexCoord2f(0, 1); glVertex2f(-1.0, 1.0); glEnd(); } static void Display( void ) { static int firsttime = 1; if (firsttime) { firsttime = 0; Init( 0, 0 ); /* don't ask */ } glClear( GL_COLOR_BUFFER_BIT ); glBindTexture(GL_TEXTURE_2D, yuvObj); glPushMatrix(); glEnable(GL_FRAGMENT_PROGRAM_ARB); glTranslatef( -1.1, 0.0, -15.0 ); glRotatef(Xrot, 1.0, 0.0, 0.0); glRotatef(Yrot, 0.0, 1.0, 0.0); glRotatef(Zrot, 0.0, 0.0, 1.0); glBindTexture(GL_TEXTURE_2D, yuvObj); DrawObject(); glPopMatrix(); glPushMatrix(); glDisable(GL_FRAGMENT_PROGRAM_ARB); glTranslatef( 1.1, 0.0, -15.0 ); glRotatef(Xrot, 1.0, 0.0, 0.0); glRotatef(Yrot, 0.0, 1.0, 0.0); glRotatef(Zrot, 0.0, 0.0, 1.0); glBindTexture(GL_TEXTURE_2D, rgbObj); DrawObject(); glPopMatrix(); glutSwapBuffers(); } static void Reshape( int width, int height ) { glViewport( 0, 0, width, height ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); glFrustum( -1.1, 1.1, -1.1, 1.1, 10.0, 100.0 ); glMatrixMode( GL_MODELVIEW ); glLoadIdentity(); glTranslatef( 0.0, 0.0, -15.0 ); } static void Key( unsigned char key, int x, int y ) { (void) x; (void) y; switch (key) { case 27: exit(0); break; } glutPostRedisplay(); } 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(); } /* #define LINEAR_FILTER */ static void Init( int argc, char *argv[] ) { const char *file; const GLfloat yuvtorgb[16] = { 1.164, 1.164, 1.164, 0, 0, -.391, 2.018, 0, 1.596, -.813, 0.0, 0, (-.0625*1.164 + -.5*1.596), (-.0625*1.164 + -.5*-.813 + -.5*-.391), (-.0625*1.164 + -.5*2.018), 1 }; if (!glutExtensionSupported("GL_ARB_fragment_program")) { printf("Error: GL_ARB_fragment_program not supported!\n"); exit(1); } if (!glutExtensionSupported("GL_EXT_422_pixels")) { printf("Error: GL_EXT_422_pixels not supported!\n"); exit(1); } glPixelStorei(GL_UNPACK_ALIGNMENT, 1); file = TEXTURE_FILE; /* Load the texture as YCbCr. */ glBindTexture(GL_TEXTURE_2D, yuvObj); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); ImageYUV = LoadYUVImage(file, &ImgWidth, &ImgHeight ); if (!ImageYUV) { printf("Couldn't read %s\n", TEXTURE_FILE); exit(0); } glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, ImgWidth, ImgHeight, 0, GL_422_EXT, GL_UNSIGNED_BYTE, ImageYUV); glEnable(GL_TEXTURE_2D); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); { static const char *modulateYUV = "!!ARBfp1.0\n" "TEMP R0;\n" "TEX R0, fragment.texcoord[0], texture[0], 2D; \n" "ADD R0, R0, {-0.0625, -0.5, -0.5, 0.0}; \n" "DP3 result.color.x, R0, {1.164, 1.596, 0.0}; \n" "DP3 result.color.y, R0, {1.164, -0.813, -0.391}; \n" "DP3 result.color.z, R0, {1.164, 0.0, 2.018}; \n" "MOV result.color.w, R0.w; \n" "END" ; GLuint modulateProg; /* Setup the fragment program */ glGenProgramsARB(1, &modulateProg); glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg); glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB, strlen(modulateYUV), (const GLubyte *)modulateYUV); 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)); } /* Now the same, but use a color matrix to do the conversion at * upload time: */ glBindTexture(GL_TEXTURE_2D, rgbObj); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glMatrixMode( GL_COLOR_MATRIX ); glLoadMatrixf( yuvtorgb ); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, ImgWidth, ImgHeight, 0, GL_422_EXT, GL_UNSIGNED_BYTE, ImageYUV); glLoadIdentity(); glMatrixMode( GL_MODELVIEW ); glEnable(GL_TEXTURE_2D); glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glShadeModel(GL_FLAT); glClearColor(0.3, 0.3, 0.4, 1.0); } int main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitWindowSize( 300, 300 ); glutInitWindowPosition( 0, 0 ); glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); glutCreateWindow(argv[0] ); glutReshapeFunc( Reshape ); glutKeyboardFunc( Key ); glutSpecialFunc( SpecialKey ); glutDisplayFunc( Display ); glutMainLoop(); return 0; }