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/*
* 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 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);
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);
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;
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));
}
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;
}
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