+++ /dev/null
-/*
- * 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;
-}
projects / mesa.git / blobdiff