298 lines
7.3 KiB
C
298 lines
7.3 KiB
C
/*
|
|
* GL_EXT_pixel_buffer_object test
|
|
*
|
|
* Brian Paul
|
|
* 11 March 2004
|
|
*/
|
|
|
|
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <GL/glew.h>
|
|
#include <GL/glut.h>
|
|
|
|
#include "../util/readtex.c" /* a hack, I know */
|
|
|
|
#define IMAGE_FILE "../images/girl.rgb"
|
|
|
|
static int ImgWidth, ImgHeight;
|
|
static GLenum ImgFormat;
|
|
static GLubyte *Image = NULL;
|
|
|
|
static int APosX, APosY; /* simple drawpixels */
|
|
static int BPosX, BPosY; /* read/draw pixels */
|
|
static int CPosX, CPosY; /* copypixels */
|
|
|
|
static GLboolean DrawFront = GL_FALSE;
|
|
static GLboolean ScaleAndBias = GL_FALSE;
|
|
static GLboolean Benchmark = GL_FALSE;
|
|
|
|
static GLuint DrawPBO, TempPBO;
|
|
|
|
|
|
static GLenum ReadFormat = GL_BGRA;
|
|
static GLenum ReadType = GL_UNSIGNED_INT_8_8_8_8_REV;
|
|
|
|
|
|
|
|
static void
|
|
CheckError(int line)
|
|
{
|
|
GLenum err = glGetError();
|
|
if (err) {
|
|
printf("GL Error 0x%x at line %d\n", (int) err, line);
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
Reset( void )
|
|
{
|
|
APosX = 5; APosY = 20;
|
|
BPosX = APosX + ImgWidth + 5; BPosY = 20;
|
|
CPosX = BPosX + ImgWidth + 5; CPosY = 20;
|
|
}
|
|
|
|
|
|
static void
|
|
PrintString(const char *s)
|
|
{
|
|
while (*s) {
|
|
glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
|
|
s++;
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
SetupPixelTransfer(GLboolean invert)
|
|
{
|
|
if (invert) {
|
|
glPixelTransferf(GL_RED_SCALE, -1.0);
|
|
glPixelTransferf(GL_RED_BIAS, 1.0);
|
|
glPixelTransferf(GL_GREEN_SCALE, -1.0);
|
|
glPixelTransferf(GL_GREEN_BIAS, 1.0);
|
|
glPixelTransferf(GL_BLUE_SCALE, -1.0);
|
|
glPixelTransferf(GL_BLUE_BIAS, 1.0);
|
|
}
|
|
else {
|
|
glPixelTransferf(GL_RED_SCALE, 1.0);
|
|
glPixelTransferf(GL_RED_BIAS, 0.0);
|
|
glPixelTransferf(GL_GREEN_SCALE, 1.0);
|
|
glPixelTransferf(GL_GREEN_BIAS, 0.0);
|
|
glPixelTransferf(GL_BLUE_SCALE, 1.0);
|
|
glPixelTransferf(GL_BLUE_BIAS, 0.0);
|
|
}
|
|
}
|
|
|
|
|
|
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
|
|
Reshape( int width, int height )
|
|
{
|
|
glViewport( 0, 0, width, height );
|
|
glMatrixMode( GL_PROJECTION );
|
|
glLoadIdentity();
|
|
glOrtho( 0.0, width, 0.0, height, -1.0, 1.0 );
|
|
glMatrixMode( GL_MODELVIEW );
|
|
glLoadIdentity();
|
|
}
|
|
|
|
|
|
static void
|
|
Key( unsigned char key, int x, int y )
|
|
{
|
|
(void) x;
|
|
(void) y;
|
|
switch (key) {
|
|
case 'b':
|
|
Benchmark = GL_TRUE;
|
|
break;
|
|
case 's':
|
|
ScaleAndBias = !ScaleAndBias;
|
|
break;
|
|
case 'f':
|
|
DrawFront = !DrawFront;
|
|
if (DrawFront) {
|
|
glDrawBuffer(GL_FRONT);
|
|
glReadBuffer(GL_FRONT);
|
|
}
|
|
else {
|
|
glDrawBuffer(GL_BACK);
|
|
glReadBuffer(GL_BACK);
|
|
}
|
|
printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK");
|
|
break;
|
|
case 27:
|
|
exit(0);
|
|
break;
|
|
}
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
|
|
static void
|
|
Init(void)
|
|
{
|
|
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
|
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
|
|
if (!glutExtensionSupported("GL_EXT_pixel_buffer_object")) {
|
|
printf("Sorry, this demo requires GL_EXT_pixel_buffer_object\n");
|
|
exit(0);
|
|
}
|
|
|
|
Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
|
|
if (!Image) {
|
|
printf("Couldn't read %s\n", IMAGE_FILE);
|
|
exit(0);
|
|
}
|
|
|
|
printf("Loaded %d by %d image\n", ImgWidth, ImgHeight );
|
|
|
|
if (ImgFormat == GL_RGB) {
|
|
/* convert to RGBA */
|
|
int i;
|
|
GLubyte *image2 = (GLubyte *) malloc(ImgWidth * ImgHeight * 4);
|
|
printf("Converting RGB image to RGBA\n");
|
|
for (i = 0; i < ImgWidth * ImgHeight; i++) {
|
|
image2[i*4+0] = Image[i*3+0];
|
|
image2[i*4+1] = Image[i*3+1];
|
|
image2[i*4+2] = Image[i*3+2];
|
|
image2[i*4+3] = 255;
|
|
}
|
|
free(Image);
|
|
Image = image2;
|
|
ImgFormat = GL_RGBA;
|
|
}
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth);
|
|
glPixelStorei(GL_PACK_ALIGNMENT, 1);
|
|
glPixelStorei(GL_PACK_ROW_LENGTH, ImgWidth);
|
|
|
|
Reset();
|
|
|
|
/* put image into DrawPBO */
|
|
glGenBuffersARB(1, &DrawPBO);
|
|
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
|
|
glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_EXT,
|
|
ImgWidth * ImgHeight * 4, Image, GL_STATIC_DRAW);
|
|
|
|
/* Setup TempPBO - used for glReadPixels & glDrawPixels */
|
|
glGenBuffersARB(1, &TempPBO);
|
|
glBindBufferARB(GL_PIXEL_PACK_BUFFER_EXT, TempPBO);
|
|
glBufferDataARB(GL_PIXEL_PACK_BUFFER_EXT,
|
|
ImgWidth * ImgHeight * 4, NULL, GL_DYNAMIC_COPY);
|
|
|
|
}
|
|
|
|
|
|
int
|
|
main( int argc, char *argv[] )
|
|
{
|
|
glutInit( &argc, argv );
|
|
glutInitWindowPosition( 0, 0 );
|
|
glutInitWindowSize( 750, 250 );
|
|
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
|
|
glutCreateWindow(argv[0]);
|
|
glewInit();
|
|
Init();
|
|
glutReshapeFunc( Reshape );
|
|
glutKeyboardFunc( Key );
|
|
glutDisplayFunc( Display );
|
|
glutMainLoop();
|
|
return 0;
|
|
}
|