2007-03-03 04:59:27 -07:00
|
|
|
/*
|
2008-11-02 07:58:06 -07:00
|
|
|
* GL_ARB_pixel_buffer_object test
|
2007-03-03 04:59:27 -07:00
|
|
|
*
|
|
|
|
* Command line options:
|
2008-11-02 07:58:06 -07:00
|
|
|
* -w WIDTH -h HEIGHT sets window size
|
2007-03-03 04:59:27 -07:00
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#define GL_GLEXT_PROTOTYPES
|
|
|
|
|
|
|
|
#include <math.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <GL/glut.h>
|
|
|
|
|
|
|
|
#include "readtex.h"
|
|
|
|
|
|
|
|
|
|
|
|
#define ANIMATE 10
|
|
|
|
#define PBO 11
|
|
|
|
#define QUIT 100
|
|
|
|
|
2008-11-02 07:58:06 -07:00
|
|
|
static GLuint DrawPBO;
|
|
|
|
|
2007-03-03 04:59:27 -07:00
|
|
|
static GLboolean Animate = GL_TRUE;
|
|
|
|
static GLboolean use_pbo = 1;
|
|
|
|
static GLboolean whole_rect = 1;
|
|
|
|
|
|
|
|
static GLfloat Drift = 0.0;
|
|
|
|
static GLfloat drift_increment = 1/255.0;
|
|
|
|
static GLfloat Xrot = 20.0, Yrot = 30.0;
|
|
|
|
|
|
|
|
static GLuint Width = 1024;
|
|
|
|
static GLuint Height = 512;
|
|
|
|
|
|
|
|
|
|
|
|
static void Idle( void )
|
|
|
|
{
|
|
|
|
if (Animate) {
|
|
|
|
|
|
|
|
Drift += drift_increment;
|
|
|
|
if (Drift >= 1.0)
|
|
|
|
Drift = 0.0;
|
|
|
|
|
|
|
|
glutPostRedisplay();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-11-02 07:58:06 -07:00
|
|
|
/*static int max( int a, int b ) { return a > b ? a : b; }*/
|
2007-03-03 04:59:27 -07:00
|
|
|
static int min( int a, int b ) { return a < b ? a : b; }
|
|
|
|
|
|
|
|
static void DrawObject()
|
|
|
|
{
|
|
|
|
GLint size = Width * Height * 4;
|
|
|
|
|
|
|
|
if (use_pbo) {
|
|
|
|
/* XXX: This is extremely important - semantically makes the buffer
|
|
|
|
* contents undefined, but in practice means that the driver can
|
|
|
|
* release the old copy of the texture and allocate a new one
|
|
|
|
* without waiting for outstanding rendering to complete.
|
|
|
|
*/
|
2008-11-02 07:58:06 -07:00
|
|
|
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
|
2007-03-03 04:59:27 -07:00
|
|
|
glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_EXT, size, NULL, GL_STREAM_DRAW_ARB);
|
|
|
|
|
|
|
|
{
|
|
|
|
char *image = glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, GL_WRITE_ONLY_ARB);
|
|
|
|
|
|
|
|
printf("char %d\n", (unsigned char)(Drift * 255));
|
|
|
|
|
2008-11-02 07:58:06 -07:00
|
|
|
memset(image, (unsigned char)(Drift * 255), size);
|
2007-03-03 04:59:27 -07:00
|
|
|
|
|
|
|
glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* BGRA is required for most hardware paths:
|
|
|
|
*/
|
|
|
|
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, Width, Height, 0,
|
|
|
|
GL_BGRA, GL_UNSIGNED_BYTE, NULL);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
static char *image = NULL;
|
|
|
|
|
|
|
|
if (image == NULL)
|
|
|
|
image = malloc(size);
|
|
|
|
|
2008-11-02 07:58:06 -07:00
|
|
|
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
|
|
|
|
|
|
|
|
memset(image, (unsigned char)(Drift * 255), size);
|
2007-03-03 04:59:27 -07:00
|
|
|
|
|
|
|
/* BGRA should be the fast path for regular uploads as well.
|
|
|
|
*/
|
|
|
|
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, Width, Height, 0,
|
|
|
|
GL_BGRA, GL_UNSIGNED_BYTE, image);
|
|
|
|
}
|
|
|
|
|
|
|
|
{
|
|
|
|
int x,y,w,h;
|
|
|
|
|
|
|
|
if (whole_rect) {
|
|
|
|
x = y = 0;
|
|
|
|
w = Width;
|
|
|
|
h = Height;
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
x = y = 0;
|
|
|
|
w = min(10, Width);
|
|
|
|
h = min(10, Height);
|
|
|
|
}
|
|
|
|
|
|
|
|
glBegin(GL_QUADS);
|
|
|
|
|
|
|
|
glTexCoord2f( x, y);
|
|
|
|
glVertex2f( x, y );
|
|
|
|
|
|
|
|
glTexCoord2f( x, y + h);
|
|
|
|
glVertex2f( x, y + h);
|
|
|
|
|
|
|
|
glTexCoord2f( x + w + .5, y + h);
|
|
|
|
glVertex2f( x + w, y + h );
|
|
|
|
|
|
|
|
glTexCoord2f( x + w, y + .5);
|
|
|
|
glVertex2f( x + w, y );
|
|
|
|
|
|
|
|
glEnd();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void Display( void )
|
|
|
|
{
|
|
|
|
static GLint T0 = 0;
|
|
|
|
static GLint Frames = 0;
|
|
|
|
GLint t;
|
|
|
|
|
|
|
|
glClear( GL_COLOR_BUFFER_BIT );
|
|
|
|
|
|
|
|
glPushMatrix();
|
|
|
|
DrawObject();
|
|
|
|
glPopMatrix();
|
|
|
|
|
|
|
|
glutSwapBuffers();
|
|
|
|
|
|
|
|
Frames++;
|
|
|
|
|
|
|
|
t = glutGet(GLUT_ELAPSED_TIME);
|
|
|
|
if (t - T0 >= 1000) {
|
|
|
|
GLfloat seconds = (t - T0) / 1000.0;
|
|
|
|
|
|
|
|
GLfloat fps = Frames / seconds;
|
|
|
|
printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
|
|
|
|
|
|
|
|
drift_increment = 2.2 * seconds / Frames;
|
|
|
|
T0 = t;
|
|
|
|
Frames = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void Reshape( int width, int height )
|
|
|
|
{
|
|
|
|
glViewport( 0, 0, width, height );
|
|
|
|
glMatrixMode( GL_PROJECTION );
|
|
|
|
glLoadIdentity();
|
|
|
|
/* glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 ); */
|
|
|
|
gluOrtho2D( 0, width, height, 0 );
|
|
|
|
glMatrixMode( GL_MODELVIEW );
|
|
|
|
glLoadIdentity();
|
|
|
|
glTranslatef(0.375, 0.375, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void ModeMenu(int entry)
|
|
|
|
{
|
|
|
|
if (entry==ANIMATE) {
|
|
|
|
Animate = !Animate;
|
|
|
|
}
|
|
|
|
else if (entry==PBO) {
|
|
|
|
use_pbo = !use_pbo;
|
|
|
|
}
|
|
|
|
else if (entry==QUIT) {
|
|
|
|
exit(0);
|
|
|
|
}
|
|
|
|
|
|
|
|
glutPostRedisplay();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void Init( int argc, char *argv[] )
|
|
|
|
{
|
|
|
|
const char *exten = (const char *) glGetString(GL_EXTENSIONS);
|
2008-11-02 07:58:06 -07:00
|
|
|
GLuint texObj;
|
2007-03-03 04:59:27 -07:00
|
|
|
GLint size;
|
|
|
|
|
|
|
|
|
2008-11-02 07:58:06 -07:00
|
|
|
if (!strstr(exten, "GL_ARB_pixel_buffer_object")) {
|
|
|
|
printf("Sorry, GL_ARB_pixel_buffer_object not supported by this renderer.\n");
|
2007-03-03 04:59:27 -07:00
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &size);
|
|
|
|
printf("%d x %d max texture size\n", size, size);
|
|
|
|
|
|
|
|
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
|
|
|
|
|
|
|
|
/* allocate two texture objects */
|
|
|
|
glGenTextures(1, &texObj);
|
|
|
|
|
|
|
|
/* setup the texture objects */
|
|
|
|
glActiveTextureARB(GL_TEXTURE0_ARB);
|
|
|
|
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, texObj);
|
|
|
|
|
|
|
|
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
|
|
|
|
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
|
|
|
|
|
|
|
|
glGenBuffersARB(1, &DrawPBO);
|
|
|
|
|
|
|
|
glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, DrawPBO);
|
|
|
|
glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_EXT,
|
|
|
|
Width * Height * 4, NULL, GL_STREAM_DRAW);
|
|
|
|
|
|
|
|
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
|
|
|
|
|
|
|
|
glEnable(GL_TEXTURE_RECTANGLE_ARB);
|
|
|
|
|
|
|
|
glShadeModel(GL_SMOOTH);
|
|
|
|
glClearColor(0.3, 0.3, 0.4, 1.0);
|
|
|
|
|
|
|
|
if (argc > 1 && strcmp(argv[1], "-info")==0) {
|
|
|
|
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
|
|
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
|
|
|
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
|
|
|
printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int main( int argc, char *argv[] )
|
|
|
|
{
|
|
|
|
GLint i;
|
|
|
|
|
|
|
|
glutInit( &argc, argv );
|
|
|
|
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
|
|
if (strcmp(argv[i], "-w") == 0) {
|
|
|
|
Width = atoi(argv[i+1]);
|
|
|
|
if (Width <= 0) {
|
|
|
|
printf("Error, bad width\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
else if (strcmp(argv[i], "-h") == 0) {
|
|
|
|
Height = atoi(argv[i+1]);
|
|
|
|
if (Height <= 0) {
|
|
|
|
printf("Error, bad height\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
glutInitWindowSize( Width, Height );
|
|
|
|
glutInitWindowPosition( 0, 0 );
|
|
|
|
glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
|
|
|
|
glutCreateWindow(argv[0] );
|
|
|
|
|
|
|
|
Init( argc, argv );
|
|
|
|
|
|
|
|
glutReshapeFunc( Reshape );
|
|
|
|
glutKeyboardFunc( Key );
|
|
|
|
glutSpecialFunc( SpecialKey );
|
|
|
|
glutDisplayFunc( Display );
|
|
|
|
glutIdleFunc( Idle );
|
|
|
|
|
|
|
|
glutCreateMenu(ModeMenu);
|
|
|
|
glutAddMenuEntry("Toggle Animation", ANIMATE);
|
|
|
|
glutAddMenuEntry("Toggle PBO", PBO);
|
|
|
|
glutAddMenuEntry("Quit", QUIT);
|
|
|
|
glutAttachMenu(GLUT_RIGHT_BUTTON);
|
|
|
|
|
|
|
|
glutMainLoop();
|
|
|
|
return 0;
|
|
|
|
}
|