EXT_422_pixels test

progs/tests/ext422square.c

@@ -0,0 +1,225 @@
+/*
+ * 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;
+}