static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, pixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
pixelsPerSecond = reads * ImgWidth * ImgHeight / seconds;
printf("Result: %d reads in %f seconds = %f pixels/sec\n",
reads, seconds, pixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
/* clear the temporary image to white (helpful for debugging */
memset(TempImage, 255, ImgWidth * ImgHeight * 4);
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
}
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, TempImage);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
CheckError(__LINE__);
/** Unbind UNPACK pixel buffer before calling glBitmap */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
glRasterPos2i(5, ImgHeight+40);
PrintString("GL_EXT_pixel_buffer_object test");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
/*** Draw from the DrawPBO */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, 0);
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
CheckError(__LINE__);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
/*** read into the Temp PBO */
glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, TempPBO);
CheckError(__LINE__);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, pixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, 0);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
pixelsPerSecond = reads * ImgWidth * ImgHeight / seconds;
printf("Result: %d reads in %f seconds = %f pixels/sec\n",
reads, seconds, pixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, 0);
}
CheckError(__LINE__);
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
CheckError(__LINE__);
/*** draw from the Temp PBO */
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, TempPBO);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, 0);
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
CheckError(__LINE__);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
CheckError(__LINE__);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
static void
Display( void )
{
glClearColor(.3, .3, .3, 1);
glClear( GL_COLOR_BUFFER_BIT );
glRasterPos2i(5, ImgHeight+25);
PrintString("f = toggle front/back s = toggle scale/bias b = benchmark");
/* draw original image */
glRasterPos2i(APosX, 5);
PrintString("Original");
if (!Triangle) {
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
}
else {
float z = 0;
glViewport(APosX, APosY, ImgWidth, ImgHeight);
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glDisable(GL_CULL_FACE);
/* Red should never be seen
*/
glBegin(GL_POLYGON);
glColor3f(1,0,0);
glVertex3f(-2, -2, z);
glVertex3f(-2, 2, z);
glVertex3f(2, 2, z);
glVertex3f(2, -2, z);
glEnd();
/* Blue background
*/
glBegin(GL_POLYGON);
glColor3f(.5,.5,1);
glVertex3f(-1, -1, z);
glVertex3f(-1, 1, z);
glVertex3f(1, 1, z);
glVertex3f(1, -1, z);
glEnd();
/* Triangle
*/
glBegin(GL_TRIANGLES);
glColor3f(.8,0,0);
glVertex3f(-0.9, -0.9, z);
glColor3f(0,.9,0);
glVertex3f( 0.9, -0.9, z);
glColor3f(0,0,.7);
glVertex3f( 0.0, 0.9, z);
glEnd();
glColor3f(1,1,1);
glViewport( 0, 0, WinWidth, WinHeight );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0.0, WinWidth, 0.0, WinHeight, -1.0, 1.0 );
}
/* might try alignment=4 here for testing */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
/* do readpixels, drawpixels */
glRasterPos2i(BPosX, 5);
PrintString("Read/DrawPixels");
SetupPixelTransfer(ScaleAndBias);
if (Benchmark) {
GLint reads = 0;
GLint endTime;
GLint startTime = glutGet(GLUT_ELAPSED_TIME);
GLdouble seconds, mpixels, mpixelsPerSecond;
printf("Benchmarking...\n");
do {
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
reads++;
endTime = glutGet(GLUT_ELAPSED_TIME);
} while (endTime - startTime < 4000); /* 4 seconds */
seconds = (double) (endTime - startTime) / 1000.0;
mpixels = reads * (ImgWidth * ImgHeight / (1000.0 * 1000.0));
mpixelsPerSecond = mpixels / seconds;
printf("Result: %d reads in %f seconds = %f Mpixels/sec\n",
reads, seconds, mpixelsPerSecond);
Benchmark = GL_FALSE;
}
else {
/* clear the temporary image to white (helpful for debugging */
memset(TempImage, 255, ImgWidth * ImgHeight * 4);
#if 1
glReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
(void) ComplexReadPixels;
#else
/* you might use this when debugging */
ComplexReadPixels(APosX, APosY, ImgWidth, ImgHeight,
ReadFormat, ReadType, TempImage);
#endif
}
glRasterPos2i(BPosX, BPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawPixels(ImgWidth, ImgHeight, ReadFormat, ReadType, TempImage);
/* do copypixels */
glRasterPos2i(CPosX, 5);
PrintString("CopyPixels");
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
