| // |
| // Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| |
| // generatemip.h: Defines the GenerateMip function, templated on the format |
| // type of the image for which mip levels are being generated. |
| |
| #ifndef LIBGLESV2_RENDERER_GENERATEMIP_H_ |
| #define LIBGLESV2_RENDERER_GENERATEMIP_H_ |
| |
| #include "libGLESv2/mathutil.h" |
| |
| namespace rx |
| { |
| struct L8 |
| { |
| unsigned char L; |
| |
| static void average(L8 *dst, const L8 *src1, const L8 *src2) |
| { |
| dst->L = ((src1->L ^ src2->L) >> 1) + (src1->L & src2->L); |
| } |
| }; |
| |
| typedef L8 R8; // R8 type is functionally equivalent for mip purposes |
| typedef L8 A8; // A8 type is functionally equivalent for mip purposes |
| |
| struct A8L8 |
| { |
| unsigned char L; |
| unsigned char A; |
| |
| static void average(A8L8 *dst, const A8L8 *src1, const A8L8 *src2) |
| { |
| *(unsigned short*)dst = (((*(unsigned short*)src1 ^ *(unsigned short*)src2) & 0xFEFE) >> 1) + (*(unsigned short*)src1 & *(unsigned short*)src2); |
| } |
| }; |
| |
| typedef A8L8 R8G8; // R8G8 type is functionally equivalent for mip purposes |
| |
| struct A8R8G8B8 |
| { |
| unsigned char B; |
| unsigned char G; |
| unsigned char R; |
| unsigned char A; |
| |
| static void average(A8R8G8B8 *dst, const A8R8G8B8 *src1, const A8R8G8B8 *src2) |
| { |
| *(unsigned int*)dst = (((*(unsigned int*)src1 ^ *(unsigned int*)src2) & 0xFEFEFEFE) >> 1) + (*(unsigned int*)src1 & *(unsigned int*)src2); |
| } |
| }; |
| |
| typedef A8R8G8B8 R8G8B8A8; // R8G8B8A8 type is functionally equivalent for mip purposes |
| |
| struct A16B16G16R16F |
| { |
| unsigned short R; |
| unsigned short G; |
| unsigned short B; |
| unsigned short A; |
| |
| static void average(A16B16G16R16F *dst, const A16B16G16R16F *src1, const A16B16G16R16F *src2) |
| { |
| dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f); |
| dst->G = gl::float32ToFloat16((gl::float16ToFloat32(src1->G) + gl::float16ToFloat32(src2->G)) * 0.5f); |
| dst->B = gl::float32ToFloat16((gl::float16ToFloat32(src1->B) + gl::float16ToFloat32(src2->B)) * 0.5f); |
| dst->A = gl::float32ToFloat16((gl::float16ToFloat32(src1->A) + gl::float16ToFloat32(src2->A)) * 0.5f); |
| } |
| }; |
| |
| struct R16F |
| { |
| unsigned short R; |
| |
| static void average(R16F *dst, const R16F *src1, const R16F *src2) |
| { |
| dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f); |
| } |
| }; |
| |
| struct R16G16F |
| { |
| unsigned short R; |
| unsigned short G; |
| |
| static void average(R16G16F *dst, const R16G16F *src1, const R16G16F *src2) |
| { |
| dst->R = gl::float32ToFloat16((gl::float16ToFloat32(src1->R) + gl::float16ToFloat32(src2->R)) * 0.5f); |
| dst->G = gl::float32ToFloat16((gl::float16ToFloat32(src1->G) + gl::float16ToFloat32(src2->G)) * 0.5f); |
| } |
| }; |
| |
| struct A32B32G32R32F |
| { |
| float R; |
| float G; |
| float B; |
| float A; |
| |
| static void average(A32B32G32R32F *dst, const A32B32G32R32F *src1, const A32B32G32R32F *src2) |
| { |
| dst->R = (src1->R + src2->R) * 0.5f; |
| dst->G = (src1->G + src2->G) * 0.5f; |
| dst->B = (src1->B + src2->B) * 0.5f; |
| dst->A = (src1->A + src2->A) * 0.5f; |
| } |
| }; |
| |
| struct R32F |
| { |
| float R; |
| |
| static void average(R32F *dst, const R32F *src1, const R32F *src2) |
| { |
| dst->R = (src1->R + src2->R) * 0.5f; |
| } |
| }; |
| |
| struct R32G32F |
| { |
| float R; |
| float G; |
| |
| static void average(R32G32F *dst, const R32G32F *src1, const R32G32F *src2) |
| { |
| dst->R = (src1->R + src2->R) * 0.5f; |
| dst->G = (src1->G + src2->G) * 0.5f; |
| } |
| }; |
| |
| struct R32G32B32F |
| { |
| float R; |
| float G; |
| float B; |
| |
| static void average(R32G32B32F *dst, const R32G32B32F *src1, const R32G32B32F *src2) |
| { |
| dst->R = (src1->R + src2->R) * 0.5f; |
| dst->G = (src1->G + src2->G) * 0.5f; |
| dst->B = (src1->B + src2->B) * 0.5f; |
| } |
| }; |
| |
| template <typename T> |
| static void GenerateMip(unsigned int sourceWidth, unsigned int sourceHeight, |
| const unsigned char *sourceData, int sourcePitch, |
| unsigned char *destData, int destPitch) |
| { |
| unsigned int mipWidth = std::max(1U, sourceWidth >> 1); |
| unsigned int mipHeight = std::max(1U, sourceHeight >> 1); |
| |
| if (sourceHeight == 1) |
| { |
| ASSERT(sourceWidth != 1); |
| |
| const T *src = (const T*)sourceData; |
| T *dst = (T*)destData; |
| |
| for (unsigned int x = 0; x < mipWidth; x++) |
| { |
| T::average(&dst[x], &src[x * 2], &src[x * 2 + 1]); |
| } |
| } |
| else if (sourceWidth == 1) |
| { |
| ASSERT(sourceHeight != 1); |
| |
| for (unsigned int y = 0; y < mipHeight; y++) |
| { |
| const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch); |
| const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch); |
| T *dst = (T*)(destData + y * destPitch); |
| |
| T::average(dst, src0, src1); |
| } |
| } |
| else |
| { |
| for (unsigned int y = 0; y < mipHeight; y++) |
| { |
| const T *src0 = (const T*)(sourceData + y * 2 * sourcePitch); |
| const T *src1 = (const T*)(sourceData + y * 2 * sourcePitch + sourcePitch); |
| T *dst = (T*)(destData + y * destPitch); |
| |
| for (unsigned int x = 0; x < mipWidth; x++) |
| { |
| T tmp0; |
| T tmp1; |
| |
| T::average(&tmp0, &src0[x * 2], &src0[x * 2 + 1]); |
| T::average(&tmp1, &src1[x * 2], &src1[x * 2 + 1]); |
| T::average(&dst[x], &tmp0, &tmp1); |
| } |
| } |
| } |
| } |
| } |
| |
| #endif // LIBGLESV2_RENDERER_GENERATEMIP_H_ |