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-/*
- * Copyright (C) 2011 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/** @file rs_math.rsh
- * \brief todo-jsams
- *
- * todo-jsams
- *
- */
-
-#ifndef __RS_MATH_RSH__
-#define __RS_MATH_RSH__
-
-
-/**
- * Return a random value between 0 (or min_value) and max_malue.
- */
-extern int __attribute__((overloadable))
- rsRand(int max_value);
-/**
- * \overload
- */
-extern int __attribute__((overloadable))
- rsRand(int min_value, int max_value);
-/**
- * \overload
- */
-extern float __attribute__((overloadable))
- rsRand(float max_value);
-/**
- * \overload
- */
-extern float __attribute__((overloadable))
- rsRand(float min_value, float max_value);
-
-/**
- * Returns the fractional part of a float
- */
-extern float __attribute__((overloadable))
- rsFrac(float);
-
-
-/////////////////////////////////////////////////////
-// int ops
-/////////////////////////////////////////////////////
-
-/**
- * Clamp the value amount between low and high.
- *
- * @param amount The value to clamp
- * @param low
- * @param high
- */
-_RS_RUNTIME uint __attribute__((overloadable, always_inline)) rsClamp(uint amount, uint low, uint high);
-
-/**
- * \overload
- */
-_RS_RUNTIME int __attribute__((overloadable, always_inline)) rsClamp(int amount, int low, int high);
-/**
- * \overload
- */
-_RS_RUNTIME ushort __attribute__((overloadable, always_inline)) rsClamp(ushort amount, ushort low, ushort high);
-/**
- * \overload
- */
-_RS_RUNTIME short __attribute__((overloadable, always_inline)) rsClamp(short amount, short low, short high);
-/**
- * \overload
- */
-_RS_RUNTIME uchar __attribute__((overloadable, always_inline)) rsClamp(uchar amount, uchar low, uchar high);
-/**
- * \overload
- */
-_RS_RUNTIME char __attribute__((overloadable, always_inline)) rsClamp(char amount, char low, char high);
-
-
-/**
- * Computes 6 frustum planes from the view projection matrix
- * @param viewProj matrix to extract planes from
- * @param left plane
- * @param right plane
- * @param top plane
- * @param bottom plane
- * @param near plane
- * @param far plane
- */
-__inline__ static void __attribute__((overloadable, always_inline))
-rsExtractFrustumPlanes(const rs_matrix4x4 *viewProj,
- float4 *left, float4 *right,
- float4 *top, float4 *bottom,
- float4 *near, float4 *far) {
- // x y z w = a b c d in the plane equation
- left->x = viewProj->m[3] + viewProj->m[0];
- left->y = viewProj->m[7] + viewProj->m[4];
- left->z = viewProj->m[11] + viewProj->m[8];
- left->w = viewProj->m[15] + viewProj->m[12];
-
- right->x = viewProj->m[3] - viewProj->m[0];
- right->y = viewProj->m[7] - viewProj->m[4];
- right->z = viewProj->m[11] - viewProj->m[8];
- right->w = viewProj->m[15] - viewProj->m[12];
-
- top->x = viewProj->m[3] - viewProj->m[1];
- top->y = viewProj->m[7] - viewProj->m[5];
- top->z = viewProj->m[11] - viewProj->m[9];
- top->w = viewProj->m[15] - viewProj->m[13];
-
- bottom->x = viewProj->m[3] + viewProj->m[1];
- bottom->y = viewProj->m[7] + viewProj->m[5];
- bottom->z = viewProj->m[11] + viewProj->m[9];
- bottom->w = viewProj->m[15] + viewProj->m[13];
-
- near->x = viewProj->m[3] + viewProj->m[2];
- near->y = viewProj->m[7] + viewProj->m[6];
- near->z = viewProj->m[11] + viewProj->m[10];
- near->w = viewProj->m[15] + viewProj->m[14];
-
- far->x = viewProj->m[3] - viewProj->m[2];
- far->y = viewProj->m[7] - viewProj->m[6];
- far->z = viewProj->m[11] - viewProj->m[10];
- far->w = viewProj->m[15] - viewProj->m[14];
-
- float len = length(left->xyz);
- *left /= len;
- len = length(right->xyz);
- *right /= len;
- len = length(top->xyz);
- *top /= len;
- len = length(bottom->xyz);
- *bottom /= len;
- len = length(near->xyz);
- *near /= len;
- len = length(far->xyz);
- *far /= len;
-}
-
-/**
- * Checks if a sphere is withing the 6 frustum planes
- * @param sphere float4 representing the sphere
- * @param left plane
- * @param right plane
- * @param top plane
- * @param bottom plane
- * @param near plane
- * @param far plane
- */
-__inline__ static bool __attribute__((overloadable, always_inline))
-rsIsSphereInFrustum(float4 *sphere,
- float4 *left, float4 *right,
- float4 *top, float4 *bottom,
- float4 *near, float4 *far) {
-
- float distToCenter = dot(left->xyz, sphere->xyz) + left->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- distToCenter = dot(right->xyz, sphere->xyz) + right->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- distToCenter = dot(top->xyz, sphere->xyz) + top->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- distToCenter = dot(bottom->xyz, sphere->xyz) + bottom->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- distToCenter = dot(near->xyz, sphere->xyz) + near->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- distToCenter = dot(far->xyz, sphere->xyz) + far->w;
- if (distToCenter < -sphere->w) {
- return false;
- }
- return true;
-}
-
-
-/**
- * Pack floating point (0-1) RGB values into a uchar4. The alpha component is
- * set to 255 (1.0).
- *
- * @param r
- * @param g
- * @param b
- *
- * @return uchar4
- */
-_RS_RUNTIME uchar4 __attribute__((overloadable)) rsPackColorTo8888(float r, float g, float b);
-
-/**
- * Pack floating point (0-1) RGBA values into a uchar4.
- *
- * @param r
- * @param g
- * @param b
- * @param a
- *
- * @return uchar4
- */
-_RS_RUNTIME uchar4 __attribute__((overloadable)) rsPackColorTo8888(float r, float g, float b, float a);
-
-/**
- * Pack floating point (0-1) RGB values into a uchar4. The alpha component is
- * set to 255 (1.0).
- *
- * @param color
- *
- * @return uchar4
- */
-_RS_RUNTIME uchar4 __attribute__((overloadable)) rsPackColorTo8888(float3 color);
-
-/**
- * Pack floating point (0-1) RGBA values into a uchar4.
- *
- * @param color
- *
- * @return uchar4
- */
-_RS_RUNTIME uchar4 __attribute__((overloadable)) rsPackColorTo8888(float4 color);
-
-/**
- * Unpack a uchar4 color to float4. The resulting float range will be (0-1).
- *
- * @param c
- *
- * @return float4
- */
-_RS_RUNTIME float4 rsUnpackColor8888(uchar4 c);
-
-
-#endif
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