--- /dev/null
+/* Copyright (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (retro_math.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * 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 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.
+ */
+
+#ifndef _LIBRETRO_COMMON_MATH_H
+#define _LIBRETRO_COMMON_MATH_H
+
+#include <stdint.h>
+
+#if defined(_WIN32) && !defined(_XBOX)
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#elif defined(_WIN32) && defined(_XBOX)
+#include <Xtl.h>
+#endif
+
+#include <limits.h>
+
+#ifdef _MSC_VER
+#include <compat/msvc.h>
+#endif
+#include <retro_inline.h>
+
+#ifndef M_PI
+#if !defined(USE_MATH_DEFINES)
+#define M_PI 3.14159265358979323846264338327
+#endif
+#endif
+
+#ifndef MAX
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#endif
+
+#ifndef MIN
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
+/**
+ * next_pow2:
+ * @v : initial value
+ *
+ * Get next power of 2 value based on initial value.
+ *
+ * Returns: next power of 2 value (derived from @v).
+ **/
+static INLINE uint32_t next_pow2(uint32_t v)
+{
+ v--;
+ v |= v >> 1;
+ v |= v >> 2;
+ v |= v >> 4;
+ v |= v >> 8;
+ v |= v >> 16;
+ v++;
+ return v;
+}
+
+/**
+ * prev_pow2:
+ * @v : initial value
+ *
+ * Get previous power of 2 value based on initial value.
+ *
+ * Returns: previous power of 2 value (derived from @v).
+ **/
+static INLINE uint32_t prev_pow2(uint32_t v)
+{
+ v |= v >> 1;
+ v |= v >> 2;
+ v |= v >> 4;
+ v |= v >> 8;
+ v |= v >> 16;
+ return v - (v >> 1);
+}
+
+/**
+ * clamp:
+ * @v : initial value
+ *
+ * Get the clamped value based on initial value.
+ *
+ * Returns: clamped value (derived from @v).
+ **/
+static INLINE float clamp_value(float v, float min, float max)
+{
+ return v <= min ? min : v >= max ? max : v;
+}
+
+/**
+ * saturate_value:
+ * @v : initial value
+ *
+ * Get the clamped 0.0-1.0 value based on initial value.
+ *
+ * Returns: clamped 0.0-1.0 value (derived from @v).
+ **/
+static INLINE float saturate_value(float v)
+{
+ return clamp_value(v, 0.0f, 1.0f);
+}
+
+/**
+ * dot_product:
+ * @a : left hand vector value
+ * @b : right hand vector value
+ *
+ * Get the dot product of the two passed in vectors.
+ *
+ * Returns: dot product value (derived from @a and @b).
+ **/
+static INLINE float dot_product(const float* a, const float* b)
+{
+ return (a[0] * b[0]) + (a[1] * b[1]) + (a[2] * b[2]);
+}
+
+/**
+ * convert_rgb_to_yxy:
+ * @rgb : in RGB colour space value
+ * @Yxy : out Yxy colour space value
+ *
+ * Convert from RGB colour space to Yxy colour space.
+ *
+ * Returns: Yxy colour space value (derived from @rgb).
+ **/
+static INLINE void convert_rgb_to_yxy(const float* rgb, float* Yxy)
+{
+ float inv;
+ float xyz[3];
+ float one[3] = {1.0, 1.0, 1.0};
+ float rgb_xyz[3][3] = {
+ {0.4124564, 0.3575761, 0.1804375},
+ {0.2126729, 0.7151522, 0.0721750},
+ {0.0193339, 0.1191920, 0.9503041}
+ };
+
+ xyz[0] = dot_product(rgb_xyz[0], rgb);
+ xyz[1] = dot_product(rgb_xyz[1], rgb);
+ xyz[2] = dot_product(rgb_xyz[2], rgb);
+
+ inv = 1.0f / dot_product(xyz, one);
+ Yxy[0] = xyz[1];
+ Yxy[1] = xyz[0] * inv;
+ Yxy[2] = xyz[1] * inv;
+}
+
+/**
+ * convert_yxy_to_rgb:
+ * @rgb : in Yxy colour space value
+ * @Yxy : out rgb colour space value
+ *
+ * Convert from Yxy colour space to rgb colour space.
+ *
+ * Returns: rgb colour space value (derived from @Yxy).
+ **/
+static INLINE void convert_yxy_to_rgb(const float* Yxy, float* rgb)
+{
+ float xyz[3];
+ float xyz_rgb[3][3] = {
+ {3.2404542, -1.5371385, -0.4985314},
+ {-0.9692660, 1.8760108, 0.0415560},
+ {0.0556434, -0.2040259, 1.0572252}
+ };
+ xyz[0] = Yxy[0] * Yxy[1] / Yxy[2];
+ xyz[1] = Yxy[0];
+ xyz[2] = Yxy[0] * (1.0 - Yxy[1] - Yxy[2]) / Yxy[2];
+
+ rgb[0] = dot_product(xyz_rgb[0], xyz);
+ rgb[1] = dot_product(xyz_rgb[1], xyz);
+ rgb[2] = dot_product(xyz_rgb[2], xyz);
+}
+
+#endif
notaz.gp2x.de / pcsx_rearmed.git / blobdiff