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// BEGIN_COPYRIGHT -*- glean -*-
/*
* Copyright © 2006 Intel Corporation
* Copyright © 1999 Allen Akin
*
* 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 (including the next
* paragraph) 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
/* ttexrect.cpp: Test the ARB_texture_rectangle extension
* Author: Eric Anholt <eric@anholt.net>
*
* Test procedure:
* Create a 255x127 texture of varying colors and bind it as a
* GL_ARB_texture_recangle target. Draw that rectangle to the window, and
* check that the texture was drawn correctly. The common failure to be
* caught with this test is not adjusting the non-normalized coordinates on
* hardware that expects normalized coordinates.
*/
#include "ttexrect.h"
#include <cassert>
#include <stdio.h>
#include <cmath>
namespace GLEAN {
/**
* Test if two colors are close enough to be considered the same.
*/
bool
TexRectTest::TestColor(const GLfloat c1[3], const GLfloat c2[3])
{
if (fabs(c1[0] - c2[0]) <= mTolerance[0] &&
fabs(c1[1] - c2[1]) <= mTolerance[1] &&
fabs(c1[2] - c2[2]) <= mTolerance[2])
return true;
else
return false;
}
void
TexRectTest::CalculateTolerance()
{
GLint rBits, gBits, bBits;
GLint rTexBits, gTexBits, bTexBits;
// Get fb resolution
glGetIntegerv(GL_RED_BITS, &rBits);
glGetIntegerv(GL_GREEN_BITS, &gBits);
glGetIntegerv(GL_BLUE_BITS, &bBits);
// Get tex resolution
glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ARB,
0, GL_TEXTURE_RED_SIZE, &rTexBits);
glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ARB,
0, GL_TEXTURE_GREEN_SIZE, &gTexBits);
glGetTexLevelParameteriv(GL_TEXTURE_RECTANGLE_ARB,
0, GL_TEXTURE_BLUE_SIZE, &bTexBits);
// Find smaller of frame buffer and texture bits
rBits = (rBits < rTexBits) ? rBits : rTexBits;
gBits = (gBits < gTexBits) ? gBits : gTexBits;
bBits = (bBits < bTexBits) ? bBits : bTexBits;
// If these fail, something's seriously wrong.
assert(rBits > 0);
assert(gBits > 0);
assert(bBits > 0);
mTolerance[0] = 3.0 / (1 << rBits);
mTolerance[1] = 3.0 / (1 << gBits);
mTolerance[2] = 3.0 / (1 << bBits);
}
#define TEXTURE_WIDTH 255
#define TEXTURE_HEIGHT 127
/**
* Creates a TEXTURE_WIDTH * TEXTURE_HEIGHT rectangular texture and draws it to
* the window. It then reads the output back to verify that the texture stayed
* intact.
*/
void
TexRectTest::runOne(BasicResult& r, Window& w)
{
float image[TEXTURE_WIDTH * TEXTURE_HEIGHT * 3];
float actual[TEXTURE_WIDTH * TEXTURE_HEIGHT * 3];
(void) w;
/* Set up a texture that is color ramps with red to black top to
* bottom and green to black left to right.
*/
for (int y = 0; y < TEXTURE_HEIGHT; y++) {
for (int x = 0; x < TEXTURE_WIDTH; x++) {
int i = (y * TEXTURE_WIDTH + x) * 3;
image[i + 0] = (float)x / (TEXTURE_WIDTH - 1);
image[i + 1] = 1.0 - ((float) y / (TEXTURE_HEIGHT - 1));
image[i + 2] = 0.0;
}
}
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glShadeModel(GL_FLAT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 256, 0, 256, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, windowSize, windowSize);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGB, 255, 127, 0,
GL_RGB, GL_FLOAT, image);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER,
GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,
GL_NEAREST);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glDrawBuffer(GL_BACK);
glReadBuffer(GL_BACK);
r.pass = true;
/* Draw our texture to the window such that each texel should map
* to the corresponding pixel of the window.
*/
glBegin(GL_POLYGON);
glTexCoord2f(0, 0);
glVertex2f(0, 0);
glTexCoord2f(TEXTURE_WIDTH, 0);
glVertex2f(TEXTURE_WIDTH, 0);
glTexCoord2f(TEXTURE_WIDTH, TEXTURE_HEIGHT);
glVertex2f(TEXTURE_WIDTH, TEXTURE_HEIGHT);
glTexCoord2f(0, TEXTURE_HEIGHT);
glVertex2f(0, TEXTURE_HEIGHT);
glEnd();
/* Read back the output */
glReadPixels(0, 0, TEXTURE_WIDTH, TEXTURE_HEIGHT,
GL_RGB, GL_FLOAT, actual);
w.swap(); // lets us watch the progress
CalculateTolerance();
/* Verify the output */
for (int y = 0; y < TEXTURE_HEIGHT; y++) {
for (int x = 0; x < TEXTURE_WIDTH; x++) {
int i = (y * TEXTURE_WIDTH + x) * 3;
if (!TestColor(&image[i], &actual[i])) {
// Report the error
env->log << name
<< ": FAIL at (" << x << "," << y
<< "):\n"
<< " Expected=("
<< image[i + 0] << ", "
<< image[i + 1] << ", "
<< image[i + 2] << ")\n"
<< " Measured=("
<< actual[i + 0] << ", "
<< actual[i + 1] << ", "
<< actual[i + 2] << ")\n";
r.pass = false;
}
}
}
} // TexRectTest::runOne
void
TexRectTest::logOne(BasicResult& r) {
logPassFail(r);
logConcise(r);
} // TexRectTest::logOne
///////////////////////////////////////////////////////////////////////////////
// The test object itself:
///////////////////////////////////////////////////////////////////////////////
TexRectTest texRectTest("texRect", "window, rgb",
"GL_ARB_texture_rectangle",
"Test basic texture rectangle functionality.\n");
} // namespace GLEAN
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