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/*
* Copyright (c) The Piglit project 2008
*
* 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
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS 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.
*/
/**
* @file
* Test whether resizing a texture and switching from/to mipmapping
* works correctly.
*/
#include <stdarg.h>
#include "piglit-util-gl-common.h"
PIGLIT_GL_TEST_MAIN(
128 /*window_width*/,
128 /*window_height*/,
GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE)
static const int CellSize = 8; /* see cell_coords */
static int testnr;
static void make_color(int nr, float* result)
{
int i;
for(i = 0; i < 4; ++i) {
result[i] = ((nr & 3) + 1) * 0.2;
nr >>= 2;
}
}
static void cell_coords(int cellnr, int *px, int *py)
{
*px = CellSize * (cellnr & 15); /* Hard-coded things! */
*py = CellSize * (cellnr / 16);
assert(cellnr < 256);
}
/** Load a texture image with a constant color generated by \ref make_color */
static void teximage2d(GLuint lvl, GLuint w, GLuint h, int colornum)
{
float color[4];
float* tex;
int i;
make_color(colornum, color);
tex = (float*)malloc(w*h*4*sizeof(float));
for(i = 0; i < w*h; ++i) {
tex[4*i] = color[0];
tex[4*i + 1] = color[1];
tex[4*i + 2] = color[2];
tex[4*i + 3] = color[3];
}
glTexImage2D(GL_TEXTURE_2D, lvl, GL_RGBA, w, h, 0, GL_RGBA, GL_FLOAT, tex);
free(tex);
}
/** Render the given texture level into the given cell and verify the resulting color*/
static int cell(int cellnr, int lvl, GLuint basew, GLuint baseh, int colornr,
const char* testnamefmt, ...)
{
float color[4];
float *readback;
float tcx = (float)CellSize / basew * (1 << lvl);
float tcy = (float)CellSize / baseh * (1 << lvl);
int cellx, celly;
int x, y;
make_color(colornr, color);
cell_coords(cellnr, &cellx, &celly);
glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2f(cellx, celly);
glTexCoord2f(tcx, 0);
glVertex2f(cellx+CellSize, celly);
glTexCoord2f(tcx, tcy);
glVertex2f(cellx+CellSize, celly+CellSize);
glTexCoord2f(0, tcy);
glVertex2f(cellx, celly+CellSize);
glEnd();
readback = (float*)malloc(CellSize*CellSize*4*sizeof(float));
glReadPixels(cellx, celly, CellSize, CellSize, GL_RGBA, GL_FLOAT, readback);
for(y = 0; y < CellSize; ++y) {
for(x = 0; x < CellSize; ++x) {
float *read = readback + 4*(y*CellSize + x);
float eps = 0.01;
if (fabs(read[0] - color[0]) > eps ||
fabs(read[1] - color[1]) > eps ||
fabs(read[2] - color[2]) > eps ||
fabs(read[3] - color[3]) > eps) {
va_list args;
va_start(args, testnamefmt);
fprintf(stderr, "Test #%i failed: ", cellnr+1);
vfprintf(stderr, testnamefmt, args);
fprintf(stderr, "\n First failing pixel %i,%i in cell at %d,%d\n", x, y, cellx, celly);
fprintf(stderr, " Expected: %f %f %f %f\n", color[0], color[1], color[2], color[3]);
fprintf(stderr, " Readback: %f %f %f %f\n", read[0], read[1], read[2], read[3]);
va_end(args);
free(readback);
return 0;
}
}
}
free(readback);
return 1;
}
/** Run a couple of tests with the given base texture size */
static int test_size(GLuint basew, GLuint baseh)
{
int lvls, lvl;
GLuint w = basew;
GLuint h = baseh;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
teximage2d(0, w, h, testnr);
if (!cell(testnr, 0, basew, baseh, testnr,
"Nearest filtering, base size %ix%i", basew, baseh))
return 0;
testnr++;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
for(lvls = 0; w >= 1 || h >= 1; lvls++, w >>= 1, h >>= 1) {
if (!w)
w = 1;
if (!h)
h = 1;
teximage2d(lvls, w, h, testnr+lvls);
}
for(lvl = 0; lvl < lvls; ++lvl) {
if (!cell(testnr+lvl, lvl, basew, baseh, testnr+lvl,
"Mip filtering, base size %ix%i, level %i",
basew, baseh, lvl))
return 0;
}
testnr += lvls;
return 1;
}
struct size {
GLuint w, h;
};
static const struct size sizes[] = {
{ 16, 16 },
{ 32, 16 },
{ 16, 32 },
{ 32, 32 },
{ 16, 16 }
};
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
int sizeidx;
testnr = 0;
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
for(sizeidx = 0; sizeidx < sizeof(sizes)/sizeof(sizes[0]); ++sizeidx) {
if (!test_size(sizes[sizeidx].w, sizes[sizeidx].h)) {
pass = GL_FALSE;
}
}
glDisable(GL_TEXTURE_2D);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
static void Reshape(int width, int height)
{
glViewport(0, 0, width, height);
piglit_ortho_projection(width, height, GL_FALSE);
}
void piglit_init(int argc, char **argv)
{
glutReshapeFunc(Reshape);
Reshape(piglit_width, piglit_height);
}
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