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-rw-r--r--progs/demos/readpix.c402
1 files changed, 0 insertions, 402 deletions
diff --git a/progs/demos/readpix.c b/progs/demos/readpix.c
deleted file mode 100644
index cc4e4902694..00000000000
--- a/progs/demos/readpix.c
+++ /dev/null
@@ -1,402 +0,0 @@
-
-/*
- * glReadPixels and glCopyPixels test
- *
- * Brian Paul March 1, 2000 This file is in the public domain.
- */
-
-#include <assert.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <string.h>
-#include <GL/glut.h>
-
-#include "readtex.h"
-
-#define IMAGE_FILE "../images/girl.rgb"
-
-static int ImgWidth, ImgHeight;
-static int WinWidth, WinHeight;
-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 GLboolean Triangle = GL_FALSE;
-static GLubyte *TempImage = NULL;
-
-#define COMBO 1
-#if COMBO == 0
-#define ReadFormat ImgFormat
-#define ReadType GL_UNSIGNED_BYTE
-#elif COMBO == 1
-static GLenum ReadFormat = GL_RGBA;
-static GLenum ReadType = GL_UNSIGNED_BYTE;
-#elif COMBO == 2
-static GLenum ReadFormat = GL_RGB;
-static GLenum ReadType = GL_UNSIGNED_BYTE;
-#elif COMBO == 3
-static GLenum ReadFormat = GL_RGB;
-static GLenum ReadType = GL_UNSIGNED_SHORT_5_6_5;
-#elif COMBO == 4
-static GLenum ReadFormat = GL_RGBA;
-static GLenum ReadType = GL_UNSIGNED_SHORT_1_5_5_5_REV;
-#elif COMBO == 5
-static GLenum ReadFormat = GL_BGRA;
-static GLenum ReadType = GL_UNSIGNED_SHORT_5_5_5_1;
-#elif COMBO == 6
-static GLenum ReadFormat = GL_BGRA;
-static GLenum ReadType = GL_UNSIGNED_SHORT_4_4_4_4_REV;
-#elif COMBO == 7
-static GLenum ReadFormat = GL_RGBA;
-static GLenum ReadType = GL_HALF_FLOAT_ARB;
-#undef GL_OES_read_format
-#endif
-
-
-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);
- }
-}
-
-
-/**
- * Exercise Pixel Pack parameters by reading the image in four pieces.
- */
-static void
-ComplexReadPixels(GLint x, GLint y, GLsizei width, GLsizei height,
- GLenum format, GLenum type, GLvoid *pixels)
-{
- const GLsizei width0 = width / 2;
- const GLsizei width1 = width - width0;
- const GLsizei height0 = height / 2;
- const GLsizei height1 = height - height0;
-
- glPixelStorei(GL_PACK_ROW_LENGTH, width);
-
- /* lower-left quadrant */
- glReadPixels(x, y, width0, height0, format, type, pixels);
-
- /* lower-right quadrant */
- glPixelStorei(GL_PACK_SKIP_PIXELS, width0);
- glReadPixels(x + width0, y, width1, height0, format, type, pixels);
-
- /* upper-left quadrant */
- glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
- glPixelStorei(GL_PACK_SKIP_ROWS, height0);
- glReadPixels(x, y + height0, width0, height1, format, type, pixels);
-
- /* upper-right quadrant */
- glPixelStorei(GL_PACK_SKIP_PIXELS, width0);
- glPixelStorei(GL_PACK_SKIP_ROWS, height0);
- glReadPixels(x + width0, y + height0, width1, height1, format, type, pixels);
-
- /* restore defaults */
- glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
- glPixelStorei(GL_PACK_SKIP_ROWS, 0);
- glPixelStorei(GL_PACK_ROW_LENGTH, ImgWidth);
-}
-
-
-
-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();
-}
-
-
-static void
-Reshape( int width, int height )
-{
- WinWidth = width;
- WinHeight = 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 't':
- Triangle = !Triangle;
- 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( GLboolean ciMode )
-{
- GLboolean have_read_format = GL_FALSE;
-
- printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
-
- Image = LoadRGBImage( IMAGE_FILE, &ImgWidth, &ImgHeight, &ImgFormat );
- if (!Image) {
- printf("Couldn't read %s\n", IMAGE_FILE);
- exit(0);
- }
-
- if (ciMode) {
- /* Convert RGB image to grayscale */
- GLubyte *indexImage = (GLubyte *) malloc( ImgWidth * ImgHeight );
- GLint i;
- for (i=0; i<ImgWidth*ImgHeight; i++) {
- int gray = Image[i*3] + Image[i*3+1] + Image[i*3+2];
- indexImage[i] = gray / 3;
- }
- free(Image);
- Image = indexImage;
- ImgFormat = GL_COLOR_INDEX;
-
- for (i=0;i<255;i++) {
- float g = i / 255.0;
- glutSetColor(i, g, g, g);
- }
- }
-
-#ifdef GL_OES_read_format
- if ( glutExtensionSupported( "GL_OES_read_format" ) ) {
- glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE_OES, (GLint *) &ReadType);
- glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES, (GLint *) &ReadFormat);
-
- have_read_format = GL_TRUE;
- }
-#endif
-
- printf( "GL_OES_read_format %ssupported. "
- "Using type / format = 0x%04x / 0x%04x\n",
- (have_read_format) ? "" : "not ",
- ReadType, ReadFormat );
-
- printf("Loaded %d by %d image\n", ImgWidth, ImgHeight );
-
- glPixelStorei(GL_UNPACK_ROW_LENGTH, ImgWidth);
- glPixelStorei(GL_PACK_ROW_LENGTH, ImgWidth);
-
- Reset();
-
- /* allocate large TempImage to store and image data type, plus an
- * extra 1KB in case we're tinkering with pack alignment.
- */
- TempImage = (GLubyte *) malloc(ImgWidth * ImgHeight * 4 * 4
- + 1000);
- assert(TempImage);
-}
-
-
-int
-main( int argc, char *argv[] )
-{
- GLboolean ciMode = GL_FALSE;
- glutInitWindowSize( 750, 250 );
- glutInit( &argc, argv );
- if (argc > 1 && strcmp(argv[1], "-ci")==0) {
- ciMode = GL_TRUE;
- }
- if (ciMode)
- glutInitDisplayMode( GLUT_INDEX | GLUT_DOUBLE );
- else
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
- glutCreateWindow(argv[0]);
- Init(ciMode);
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- glutMainLoop();
- return 0;
-}
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