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/* -*- c -*- *****************************************************************
** Copyright (C) 2005 Sandia Corporation
** Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
** the U.S. Government retains certain rights in this software.
**
** This source code is released under the New BSD License.
**
** This tests a corner case in which the bounds of an object extens from
** the viewing frustum to behind the viewpoint in perspective mode.
*****************************************************************************/
#include <IceTGL.h>
#include "test_util.h"
#include "test_codes.h"
#include <stdlib.h>
#include <stdio.h>
static void draw(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_QUADS);
glVertex3d(-1.0, -1.0, 0.0);
glVertex3d(1.0, -1.0, 0.0);
glVertex3d(1.0, 1.0, 0.0);
glVertex3d(-1.0, 1.0, 0.0);
glEnd();
}
static void PrintMatrix(float *mat)
{
int r, c;
for (c = 0; c < 4; c++) {
for (r = 0; r < 4; r++) {
printstat("%f ", mat[4*r + c]);
}
printstat("\n");
}
}
static int BoundsBehindViewerRun()
{
float mat[16];
IceTImage image;
IceTInt rank;
icetGetIntegerv(ICET_RANK, &rank);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
icetGLDrawCallback(draw);
icetStrategy(ICET_STRATEGY_REDUCE);
icetBoundingBoxd(-1.0, 1.0, -1.0, 1.0, -0.0, 0.0);
icetSetColorFormat(ICET_IMAGE_COLOR_RGBA_UBYTE);
icetSetDepthFormat(ICET_IMAGE_DEPTH_FLOAT);
/* We're just going to use one tile. */
icetResetTiles();
icetAddTile(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT, 0);
/* Set up the transformation such that the quad in draw should cover the
entire screen, but part of it extends behind the viewpoint. Furthermore, a
naive division by w will show all points to the right of the screen (which,
of course, is wrong). */
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslated(0.0, 0.0, -1.5);
glRotated(10.0, 0.0, 1.0, 0.0);
glScaled(10.0, 10.0, 10.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 1.0, 2.0);
printstat("Modelview matrix:\n");
glGetFloatv(GL_MODELVIEW_MATRIX, mat);
PrintMatrix(mat);
printstat("Projection matrix:\n");
glGetFloatv(GL_PROJECTION_MATRIX, mat);
PrintMatrix(mat);
/* Other normal OpenGL setup. */
glEnable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glColor3d(1.0, 1.0, 1.0);
/* All the processes have the same data. Go ahead and tell IceT. */
icetDataReplicationGroupColor(0);
image = icetGLDrawFrame();
/* Test the resulting image to make sure the polygon was drawn over it. */
if (rank == 0) {
IceTUInt *cb = icetImageGetColorui(image);
if (cb[0] != 0xFFFFFFFF) {
printstat("First pixel in color buffer wrong: 0x%x\n", cb[0]);
return TEST_FAILED;
}
}
return TEST_PASSED;
}
int BoundsBehindViewer(int argc, char *argv[])
{
/* To remove warning */
(void)argc;
(void)argv;
return run_test(BoundsBehindViewerRun);
}
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