diff options
Diffstat (limited to 'renderscript/include/rs_math.rsh')
| -rw-r--r-- | renderscript/include/rs_math.rsh | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/renderscript/include/rs_math.rsh b/renderscript/include/rs_math.rsh new file mode 100644 index 0000000..8117ca8 --- /dev/null +++ b/renderscript/include/rs_math.rsh @@ -0,0 +1,248 @@ +/* + * 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 |