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/*
* Copyright © 2011 Intel Corporation
*
* 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.
*/
/** @file pack.c
*
* Tests packing of floating point values to GL_EXT_packed_float's
* GL_UNSIGNED_INT_10F_11F_11F_REV format.
*/
#include "piglit-util.h"
PIGLIT_GL_TEST_MAIN(
10 /*window_width*/,
10 /*window_height*/,
GLUT_RGB | GLUT_ALPHA | GLUT_DOUBLE)
/* Any maximum e with m != 0 is NAN */
#define PACK(r, g, b) ((b << 22) | (g << 11) | (r))
#define GET_R(p) ((p) & 0x7ff)
#define GET_G(p) (((p) >> 11) & 0x7ff)
#define GET_B(p) (((p) >> 22) & 0x3ff)
/* "An unsigned 11-bit floating-point number has no sign bit, a
* 5-bit exponent (E), and a 6-bit mantissa (M). The value of an
* unsigned 11-bit floating-point number (represented as an
* 11-bit unsigned integer N) is determined by the following:
*
* 0.0, if E == 0 and M == 0,
* 2^-14 * (M / 64), if E == 0 and M != 0,
* 2^(E-15) * (1 + M/64), if 0 < E < 31,
* INF, if E == 31 and M == 0, or
* NaN, if E == 31 and M != 0,
*
* where
*
* E = floor(N / 64), and
* M = N mod 64.
*
* Implementations are also allowed to use any of the following
* alternative encodings:
*
* 0.0, if E == 0 and M != 0
* 2^(E-15) * (1 + M/64) if E == 31 and M == 0
* 2^(E-15) * (1 + M/64) if E == 31 and M != 0"
*/
#define F11(e, m) ((e) << 6 | (m))
/* "An unsigned 10-bit floating-point number has no sign bit, a
* 5-bit exponent (E), and a 5-bit mantissa (M). The value of an
* unsigned 10-bit floating-point number (represented as an
* 10-bit unsigned integer N) is determined by the following:
*
* 0.0, if E == 0 and M == 0,
* 2^-14 * (M / 32), if E == 0 and M != 0,
* 2^(E-15) * (1 + M/32), if 0 < E < 31,
* INF, if E == 31 and M == 0, or
* NaN, if E == 31 and M != 0,
*
* where
*
* E = floor(N / 32), and
* M = N mod 32."
*/
#define F10(e, m) ((e) << 5 | (m))
enum piglit_result
piglit_display(void)
{
/* UNREACHED */
return PIGLIT_FAIL;
}
#define VALUE(r, g, b, p_r, p_g, p_b) { {r, g, b}, PACK(p_r, p_g, p_b) }
struct {
float in;
uint32_t f10;
uint32_t f11;
} values[] = {
{ 1.0, F10(15, 0), F11(15, 0) },
{ -1.0, F10(0, 0), F11(0, 0) },
/* "Likewise, finite positive values greater than 65024
* (the maximum finite representable unsigned 11-bit
* floating-point value) are converted to 65024.
*
* ...
*
* Likewise, finite positive values greater than 64512
* (the maximum finite representable unsigned 10-bit
* floating-point value) are converted to 64512"
*/
{ 1000000, F10(30, 31), F11(30, 63) },
{ 65025, F10(30, 31), F11(30, 63) },
{ 64513, F10(30, 31), F11(30, 62) },
/* "Additionally: negative infinity is converted to zero;
* positive infinity is converted to positive infinity;
* and both positive and negative NaN are converted to
* positive NaN."
*/
{ INFINITY, F10(31, 0), F11(31, 0) },
{ -INFINITY, F10(0, 0), F11(0, 0) },
{ NAN, F10(31, 1), F11(31, 1) },
{ -NAN, F10(31, 1), F11(31, 1) },
};
/* Per-pixel RGB float values. */
static float in[ARRAY_SIZE(values) * 3][3];
/* Per-pixel packed RGB float results */
static uint32_t out[ARRAY_SIZE(values) * 3];
/* Per-pixel packed RGB float values */
static uint32_t expected[ARRAY_SIZE(values) * 3];
static uint32_t *
get_packed_values()
{
static float outf[ARRAY_SIZE(values) * 3][3];
GLuint tex;
int i;
/* Set up the texture data. */
for (i = 0; i < ARRAY_SIZE(values); i++) {
in[i * 3 + 0][0] = values[i].in;
in[i * 3 + 0][1] = 0.0;
in[i * 3 + 0][2] = 0.0;
in[i * 3 + 1][0] = 0.0;
in[i * 3 + 1][1] = values[i].in;
in[i * 3 + 1][2] = 0.0;
in[i * 3 + 2][0] = 0.0;
in[i * 3 + 2][1] = 0.0;
in[i * 3 + 2][2] = values[i].in;
expected[i * 3 + 0] = PACK(values[i].f11, 0, 0);
expected[i * 3 + 1] = PACK(0, values[i].f11, 0);
expected[i * 3 + 2] = PACK(0, 0, values[i].f10);
}
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F,
1, ARRAY_SIZE(values) * 3, 0,
GL_RGB, GL_FLOAT, in);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGB,
GL_UNSIGNED_INT_10F_11F_11F_REV, out);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGB,
GL_FLOAT, outf);
glDeleteTextures(1, &tex);
return out;
}
static bool
equals_11(uint32_t e, uint32_t o)
{
uint32_t e_exp = (e >> 6) & 0x1f;
uint32_t e_man = e & 0x3f;
uint32_t o_exp = (o >> 6) & 0x1f;
uint32_t o_man = o & 0x3f;
if (e_exp == 0) {
/* Implementations are allowed to treat denorms as 0.0 */
return o_exp == 0;
} else if (e_exp == 31) {
if (e_man == 0)
return o_exp == 31 && o_man == 0;
else
return o_exp == 31;
} else {
return e == o;
}
}
static bool
equals_10(uint32_t e, uint32_t o)
{
uint32_t e_exp = (e >> 5) & 0x1f;
uint32_t e_man = e & 0x1f;
uint32_t o_exp = (o >> 5) & 0x1f;
uint32_t o_man = o & 0x1f;
if (e_exp == 0) {
/* Implementations are allowed to treat denorms as 0.0 */
return o_exp == 0;
} else if (e_exp == 31) {
if (e_man == 0)
return o_exp == 31 && o_man == 0;
else
return o_exp == 31;
} else {
return e == o;
}
}
static bool
test_output()
{
bool pass = true;
int i;
for (i = 0; i < ARRAY_SIZE(values) * 3; i++) {
uint32_t e_r = GET_R(expected[i]);
uint32_t e_g = GET_G(expected[i]);
uint32_t e_b = GET_B(expected[i]);
uint32_t o_r = GET_R(out[i]);
uint32_t o_g = GET_G(out[i]);
uint32_t o_b = GET_B(out[i]);
if (!equals_11(e_r, o_r) ||
!equals_11(e_g, o_g) ||
!equals_10(e_b, o_b)) {
printf("Packed float value mismatch:\n");
printf(" input data: %f, %f, %f\n",
in[i][0], in[i][1], in[i][2]);
printf(" expected: 0x%08x (0x%03x, 0x%03x, 0x%03x)\n",
expected[i], e_r, e_g, e_b);
printf(" observed: 0x%08x (0x%03x, 0x%03x, 0x%03x)\n",
out[i], o_r, o_g, o_b);
}
}
return pass;
}
void
piglit_init(int argc, char **argv)
{
bool pass = true;
piglit_require_extension("GL_ARB_texture_float");
piglit_require_extension("GL_EXT_packed_float");
piglit_require_extension("GL_ARB_texture_non_power_of_two");
get_packed_values();
pass = test_output();
piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
}
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