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// BEGIN_COPYRIGHT -*- glean -*-
//
// Copyright (C) 1999 Allen Akin All Rights Reserved.
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the
// Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
// KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ALLEN AKIN BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
// AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
// OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// END_COPYRIGHT
// tscissor.cpp: Basic test of OpenGL scissor.
//
// This test verifies that the four corner pixels, and the four pixels
// diagonally inside the corners, of a scissored region are filled
// correctly. It then tests up to two pixels in both the horizontal and
// vertical directions of the scissor region to verify that they are
// unfilled.
//
// To test for pass/fail, we examine the color buffer for white or black,
// respectively.
//
// Author: Gareth Hughes <gareth@valinux.com> December 2000
#include "tscissor.h"
namespace GLEAN {
/* Verification helper macros:
*/
#define BAD_PIXEL( X, Y, R, G, B ) ( image[X][Y][0] != (R) || \
image[X][Y][1] != (G) || \
image[X][Y][2] != (B) )
#define TEST_PIXEL( X, Y, R, G, B, E ) \
do { \
if ( BAD_PIXEL( X, Y, R, G, B ) ) { \
FailMessage( r, E, X, Y, \
i, i, 10-2*i, 10-2*i ); \
passed = false; \
} \
} while (0)
#define TEST_CORNER( X, Y, SX, SY ) \
do { \
TEST_PIXEL( X, Y, 1.0, 1.0, 1.0, 1 ); \
TEST_PIXEL( X SX 1, Y SY 1, 1.0, 1.0, 1.0, 2 ); \
for ( j = 1 ; j <= i ; j++ ) { \
TEST_PIXEL( X - SX j, Y, 0.0, 0.0, 0.0, j ); \
TEST_PIXEL( X, Y - SY j, 0.0, 0.0, 0.0, j ); \
} \
} while (0)
void
ScissorTest::FailMessage( BasicResult &r, int error, int x, int y,
int sx, int sy, int sw, int sh ) const
{
env->log << name << ": FAIL "
<< r.config->conciseDescription() << "\n";
env->log << "\tOff by " << error << " error at"
<< " row " << x << " column " << y;
env->log << "\n\tglScissor( "
<< sx << ", " << sy << ", "
<< sw << ", " << sh << " )\n\n";
}
///////////////////////////////////////////////////////////////////////////////
// runOne: Run a single test case
///////////////////////////////////////////////////////////////////////////////
void
ScissorTest::runOne( BasicResult& r, Window& w ) {
bool passed = true;
int i, j, k;
// Draw 10x10 quads, as they fit nicely into a terminal window
// when dumped as RGB triplets...
glViewport( 0, 0, 10, 10 );
glDisable( GL_DITHER );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glOrtho( 0.0, 1.0, 0.0, 1.0, -1.0, 1.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glClearColor( 0.0, 0.0, 0.0, 0.0 );
glColor3f( 1.0, 1.0, 1.0 );
if ( env->options.verbosity ) env->log << "\n";
for ( i = 0 ; i < 3 ; i++ ) {
float image[10][10][3];
glDisable( GL_SCISSOR_TEST );
glClear( GL_COLOR_BUFFER_BIT );
glEnable( GL_SCISSOR_TEST );
glScissor( i, i, 10-2*i, 10-2*i );
glBegin( GL_QUADS );
glVertex3f( 0.0, 0.0, 0.0 );
glVertex3f( 1.0, 0.0, 0.0 );
glVertex3f( 1.0, 1.0, 0.0 );
glVertex3f( 0.0, 1.0, 0.0 );
glEnd();
w.swap();
glReadPixels( 0, 0, 10, 10, GL_RGB, GL_FLOAT, image );
// Dump the entire 10x10 image so the exact results can
// be inspected. Should make any failures pretty clear.
if ( env->options.verbosity ) {
env->log << "glScissor( "
<< i << ", " << i << ", "
<< 10-2*i << ", " << 10-2*i << " ):\n\n";
for ( j = 0 ; j < 10 ; j++ ) {
for ( k = 0 ; k < 10 ; k++ ) {
env->log << " " << image[j][k][0]
<< " " << image[j][k][1]
<< " " << image[j][k][2];
}
env->log << "\n";
}
env->log << "\n";
}
// Test the four corners. Macro magic, I know...
TEST_CORNER( i, i, +, + );
TEST_CORNER( 9 - i, i, -, + );
TEST_CORNER( 9 - i, 9 - i, -, - );
TEST_CORNER( i, 9 - i, +, - );
}
r.pass = passed;
} // ScissorTest::runOne
///////////////////////////////////////////////////////////////////////////////
// logOne: Log a single test case
///////////////////////////////////////////////////////////////////////////////
void
ScissorTest::logOne( BasicResult& r ) {
if ( r.pass ) {
logPassFail( r );
logConcise( r );
}
} // ScissorTest::logOne
///////////////////////////////////////////////////////////////////////////////
// The test object itself:
///////////////////////////////////////////////////////////////////////////////
ScissorTest scissorTest( "scissor", "window, rgb",
"This test performs a basic test of the OpenGL scissor. It\n"
"checks for off-by-one errors around all four corners of the\n"
"scissored region, perhaps the most common cause of scissor\n"
"test failures.\n"
);
} // namespace GLEAN
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