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109 lines
2.2 KiB
C
109 lines
2.2 KiB
C
#include <gtk/gtk.h>
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#include "gsk/gl/fp16private.h"
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static void
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test_constants (void)
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{
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struct {
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float f;
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guint16 h;
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} tests[] = {
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{ 0.0, FP16_ZERO },
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{ 1.0, FP16_ONE },
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{ -1.0, FP16_MINUS_ONE },
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};
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for (int i = 0; i < G_N_ELEMENTS (tests); i++)
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{
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float f[4];
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guint16 h[4];
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memset (f, 0, sizeof (f));
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f[0] = tests[i].f;
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float_to_half4 (f, h);
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g_assert_cmpuint (h[0], ==, tests[i].h);
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memset (h, 0, sizeof (h));
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h[0] = tests[i].h;
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half_to_float4 (h, f);
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g_assert_cmpfloat (f[0], ==, tests[i].f);
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}
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}
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static float
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random_representable_float (void)
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{
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guint16 h[4];
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float f[4];
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do
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{
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/* generate a random float thats representable as fp16 */
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memset (h, 0, sizeof (h));
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h[0] = g_random_int_range (G_MININT16, G_MAXINT16);
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half_to_float4 (h, f);
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}
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while (!isnormal (f[0])); /* skip nans and infs since they don't compare well */
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return f[0];
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}
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static void
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test_roundtrip (void)
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{
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for (int i = 0; i < 100; i++)
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{
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float f[4];
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float f2[4];
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guint16 h[4];
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f2[0] = random_representable_float ();
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memset (f, 0, sizeof (f));
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f[0] = f2[0];
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float_to_half4 (f, h);
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half_to_float4 (h, f2);
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g_assert_cmpfloat (f[0], ==, f2[0]);
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}
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}
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/* Test that the array version work as expected,
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* in particular with unaligned boundaries.
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*/
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static void
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test_many (void)
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{
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for (int i = 0; i < 100; i++)
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{
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int size = g_random_int_range (100, 200);
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int offset = g_random_int_range (0, 20);
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guint16 *h = g_new0 (guint16, size);
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float *f = g_new0 (float, size);
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float *f2 = g_new0 (float, size);
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for (int j = offset; j < size; j++)
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f[j] = random_representable_float ();
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float_to_half (f + offset, h + offset, size - offset);
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half_to_float (h + offset, f2 + offset, size - offset);
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for (int j = offset; j < size; j++)
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g_assert_cmpfloat (f[j], ==, f2[j]);
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}
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}
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int
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main (int argc, char *argv[])
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{
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(g_test_init) (&argc, &argv, NULL);
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g_test_add_func ("/half-float/constants", test_constants);
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g_test_add_func ("/half-float/roundtrip", test_roundtrip);
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g_test_add_func ("/half-float/many", test_many);
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return g_test_run ();
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}
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