Misha Koshelev : d3dx9_36: Implement and add tests for D3DXFloat16To32Array .

[Alexandre Julliard]

Module: wine
Branch: master
Commit: a6b40624dbc457ba7b0b4b307b1eb88617c67197
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=a6b40624dbc457ba7b0b4b307b1eb88617c67197

Author: Misha Koshelev <misha680 at gmail.com>
Date:   Wed Jun 29 11:16:29 2011 -0400

d3dx9_36: Implement and add tests for D3DXFloat16To32Array.

---

 dlls/d3dx9_36/d3dx9_36.spec |    2 +-
 dlls/d3dx9_36/math.c        |   32 +++++++++++++++++++++++
 dlls/d3dx9_36/tests/math.c  |   60 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 93 insertions(+), 1 deletions(-)

diff --git a/dlls/d3dx9_36/d3dx9_36.spec b/dlls/d3dx9_36/d3dx9_36.spec
index a9b98a7..5973d20 100644
--- a/dlls/d3dx9_36/d3dx9_36.spec
+++ b/dlls/d3dx9_36/d3dx9_36.spec
@@ -130,7 +130,7 @@
 @ stub D3DXFillVolumeTextureTX(ptr ptr)
 @ stdcall D3DXFilterTexture(ptr ptr long long)
 @ stdcall D3DXFindShaderComment(ptr long ptr ptr)
-@ stub D3DXFloat16To32Array(ptr ptr long)
+@ stdcall D3DXFloat16To32Array(ptr ptr long)
 @ stub D3DXFloat32To16Array(ptr ptr long)
 @ stub D3DXFrameAppendChild(ptr ptr)
 @ stub D3DXFrameCalculateBoundingSphere(ptr ptr ptr)
diff --git a/dlls/d3dx9_36/math.c b/dlls/d3dx9_36/math.c
index fdb5f92..fde3e4e 100644
--- a/dlls/d3dx9_36/math.c
+++ b/dlls/d3dx9_36/math.c
@@ -1769,3 +1769,35 @@ D3DXVECTOR4* WINAPI D3DXVec4TransformArray(D3DXVECTOR4* out, UINT outstride, CON
     }
     return out;
 }
+
+/* Native d3dx9's D3DXFloat16to32Array lacks support for NaN and Inf. Specifically, e = 16 is treated as a
+ * regular number - e.g., 0x7fff is converted to 131008.0 and 0xffff to -131008.0. */
+static inline float float_16_to_32(const unsigned short in)
+{
+    const unsigned short s = (in & 0x8000);
+    const unsigned short e = (in & 0x7C00) >> 10;
+    const unsigned short m = in & 0x3FF;
+    const float sgn = (s ? -1.0f : 1.0f);
+
+    if (e == 0)
+    {
+        if (m == 0) return sgn * 0.0f; /* +0.0 or -0.0 */
+        else return sgn * powf(2, -14.0f) * (m / 1024.0f);
+    }
+    else
+    {
+        return sgn * powf(2, e - 15.0f) * (1.0f + (m / 1024.0f));
+    }
+}
+
+FLOAT *WINAPI D3DXFloat16To32Array(FLOAT *pout, CONST D3DXFLOAT16 *pin, UINT n)
+{
+    unsigned int i;
+
+    for (i = 0; i < n; ++i)
+    {
+        pout[i] = float_16_to_32(pin[i].value);
+    }
+
+    return pout;
+}
diff --git a/dlls/d3dx9_36/tests/math.c b/dlls/d3dx9_36/tests/math.c
index 5ad1924..aa3f135 100644
--- a/dlls/d3dx9_36/tests/math.c
+++ b/dlls/d3dx9_36/tests/math.c
@@ -21,6 +21,7 @@
 
 #include "wine/test.h"
 #include "d3dx9.h"
+#include <math.h>
 
 #define ARRAY_SIZE 5
 
@@ -2215,6 +2216,64 @@ static void test_D3DXVec_Array(void)
     compare_planes(exp_plane, out_plane);
 }
 
+static void test_D3DXFloat_Array(void)
+{
+    unsigned int i;
+    void *out = NULL;
+    D3DXFLOAT16 half;
+    FLOAT single;
+    struct
+    {
+        FLOAT single_in;
+
+        /* half_ver2 occurs on WXPPROSP3 (32 bit math), WVISTAADM (32 bit math), W7PRO (32 bit math) */
+        WORD half_ver1, half_ver2;
+
+        /* single_out_ver2 confirms that half -> single conversion is consistent across platforms */
+        FLOAT single_out_ver1, single_out_ver2;
+    } testdata[] = {
+        { 80000.0f, 0x7c00, 0x7ce2, 65536.0f, 80000.0f },
+        { 65503.0f, 0x7bff, 0x7bff, 65504.0f, 65504.0f },
+        { 65504.0f, 0x7bff, 0x7bff, 65504.0f, 65504.0f },
+        { 65520.0f, 0x7bff, 0x7c00, 65504.0f, 65536.0f },
+        { 65521.0f, 0x7c00, 0x7c00, 65536.0f, 65536.0f },
+        { 65534.0f, 0x7c00, 0x7c00, 65536.0f, 65536.0f },
+        { 65535.0f, 0x7c00, 0x7c00, 65535.0f, 65536.0f },
+        { 65536.0f, 0x7c00, 0x7c00, 65536.0f, 65536.0f },
+        { -80000.0f, 0xfc00, 0xfce2, -65536.0f, -80000.0f },
+        { -65503.0f, 0xfbff, 0xfbff, -65504.0f, -65504.0f },
+        { -65504.0f, 0xfbff, 0xfbff, -65504.0f, -65504.0f },
+        { -65520.0f, 0xfbff, 0xfc00, -65504.0f, -65536.0f },
+        { -65521.0f, 0xfc00, 0xfc00, -65536.0f, -65536.0f },
+        { -65534.0f, 0xfc00, 0xfc00, -65536.0f, -65536.0f },
+        { -65535.0f, 0xfc00, 0xfc00, -65535.0f, -65536.0f },
+        { -65536.0f, 0xfc00, 0xfc00, -65536.0f, -65536.0f },
+        { INFINITY, 0x7c00, 0x7fff, 65536.0f, 131008.0f },
+        { -INFINITY, 0xffff, 0xffff, -131008.0f, -131008.0f },
+        { NAN, 0x7fff, 0x7fff, 131008.0f, 131008.0f },
+        { -NAN, 0xffff, 0xffff, -131008.0f, -131008.0f },
+        { 0.0f, 0x0, 0x0, 0.0f, 0.0f },
+        { -0.0f, 0x8000, 0x8000, 0.0f, 0.0f },
+    };
+
+    /* exception on NULL out or in parameter */
+    out = D3DXFloat16To32Array(&single, (D3DXFLOAT16 *)&half, 0);
+    ok(out == &single, "Got %p, expected %p.\n", out, &single);
+
+    for (i = 0; i < sizeof(testdata)/sizeof(testdata[0]); i++)
+    {
+        out = D3DXFloat16To32Array(&single, (D3DXFLOAT16 *)&testdata[i].half_ver1, 1);
+        ok(out == &single, "Got %p, expected %p.\n", out, &single);
+        ok(relative_error(single, testdata[i].single_out_ver1) < admitted_error,
+           "Got %g, expected %g for index %d.\n", single, testdata[i].single_out_ver1, i);
+
+        out = D3DXFloat16To32Array(&single, (D3DXFLOAT16 *)&testdata[i].half_ver2, 1);
+        ok(out == &single, "Got %p, expected %p.\n", out, &single);
+        ok(relative_error(single, testdata[i].single_out_ver2) < admitted_error,
+           "Got %g, expected %g for index %d.\n", single, testdata[i].single_out_ver2, i);
+    }
+}
+
 START_TEST(math)
 {
     D3DXColorTest();
@@ -2230,4 +2289,5 @@ START_TEST(math)
     test_Matrix_Decompose();
     test_Matrix_Transformation2D();
     test_D3DXVec_Array();
+    test_D3DXFloat_Array();
 }