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ImageDraw: Make algorithm agnostic of destination format

This commit is contained in:
doyle 2020-07-12 11:43:53 +10:00
parent 856ee2a627
commit e938b49a9c
2 changed files with 67 additions and 33 deletions
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12
README.md
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@ -1,5 +1,5 @@
# RaylibSIMD
Toy re-implementations of some of the software image routines in Raylib using the SSE instruction set for my learning purposes.
Re-implementations of some of the software image routines in Raylib using the SSE instruction set for educational purposes.
To test it out, copy `RaylibSIMD.h` into Raylib's folder and in `textures.c` after all the file includes, include and enable the single header file.
@ -7,3 +7,13 @@ To test it out, copy `RaylibSIMD.h` into Raylib's folder and in `textures.c` aft
#define RAYLIB_SIMD_IMPLEMENTATION
#include "RaylibSIMD.h"
```
RaylibSIMD offers accelerated versions available with the `RaylibSIMD_*` prefix.
```cpp
void RaylibSIMD_ImageDraw (Image *dst, Image src, Rectangle srcRec, Rectangle dstRec, Color tint);
Image RaylibSIMD_GenImageColor (int width, int height, Color color);
void RaylibSIMD_ImageDrawRectangleRec(Image *dst, Rectangle rec, Color color);
void RaylibSIMD_ImageDrawRectangle (Image *dst, int posX, int posY, int width, int height, Color color);
void RaylibSIMD_ImageClearBackground (Image *dst, Color color);
```

88
RaylibSIMD.h
View File

@ -411,7 +411,15 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
float const INV_255 = 1.f / 255.f;
RaylibSIMD_ImageDrawMode draw_mode = RaylibSIMD_ImageDrawMode_Original;
if (dst->format == UNCOMPRESSED_R8G8B8A8 &&
// TODO(doyle): Other destination formats untested but algorithm has
// been written in a way that is agnostic of the format. Test and
// verify.
if (dst->format == UNCOMPRESSED_R8G8B8A8 ||
dst->format == UCOMPRESSED_R8G8B8 ||
dst->format == UNCOMPRESSED_R5G6B5 ||
dst->format == UNCOMPRESSED_R5G5B5A1 ||
dst->format == UNCOMPRESSED_R4G4B4A4)
&&
(srcPtr->format == UNCOMPRESSED_R8G8B8A8 ||
srcPtr->format == UNCOMPRESSED_R8G8B8 ||
srcPtr->format == UNCOMPRESSED_R5G6B5 ||
@ -509,18 +517,17 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
__m128 const tint_b01_4x = _mm_set1_ps(tint.b * INV_255);
__m128 const tint_a01_4x = _mm_set1_ps(tint.a * INV_255);
__m128 const one_4x = _mm_set1_ps(1.f);
__m128 const u255_4x = _mm_set1_ps(255.f);
__m128i const hex_0xFF_4x = _mm_set1_epi32(0xFF);
float src_alpha_min = 0.f;
if (srcPtr->format == UNCOMPRESSED_R8G8B8) src_alpha_min = 255.f;
else if (srcPtr->format == UNCOMPRESSED_R5G6B5) src_alpha_min = 255.f;
float src_alpha_min = 0.f;
float dest_alpha_min = 0.f;
if (srcPtr->format == UNCOMPRESSED_R8G8B8 || srcPtr->format == UNCOMPRESSED_R5G6B5) src_alpha_min = 255.f;
if (dst->format == UNCOMPRESSED_R8G8B8 || dst->format == UNCOMPRESSED_R5G6B5) dest_alpha_min = 255.f;
RaylibSIMD_PixelPerLaneShuffle src_lanes = RaylibSIMD__FormatToPixelPerLaneShuffle128Bit(srcPtr->format);
RaylibSIMD_PixelPerLaneShuffle dest_lanes = RaylibSIMD__FormatToPixelPerLaneShuffle128Bit(dst->format);
__m128 const src_alpha_min_4x = _mm_set1_ps(src_alpha_min);
__m128 const dest_alpha_min_4x = _mm_set1_ps(dest_alpha_min);
__m128i src_r_bit_mask = _mm_set1_epi32(src_lanes.r_bit_mask);
__m128i src_g_bit_mask = _mm_set1_epi32(src_lanes.g_bit_mask);
__m128i src_b_bit_mask = _mm_set1_epi32(src_lanes.b_bit_mask);
@ -541,14 +548,21 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
__m128 dest_b_to_01_coefficient = _mm_set1_ps(dest_lanes.b_to_01_coefficient);
__m128 dest_a_to_01_coefficient = _mm_set1_ps(dest_lanes.a_to_01_coefficient);
__m128 dest_r01_to_pixel_format_coefficient = _mm_rcp_ps(dest_r_to_01_coefficient);
__m128 dest_g01_to_pixel_format_coefficient = _mm_rcp_ps(dest_g_to_01_coefficient);
__m128 dest_b01_to_pixel_format_coefficient = _mm_rcp_ps(dest_b_to_01_coefficient);
__m128 dest_a01_to_pixel_format_coefficient = _mm_rcp_ps(dest_a_to_01_coefficient);
// NOTE: Divide by float because we blend in [0,1] 32 bit float space
// Each color component requires 1 SIMD lane to perform such blend.
// Each color component requires 1 SIMD float lane to perform such blend.
int const PIXELS_PER_SIMD_WRITE = sizeof(__m128) / sizeof(float);
int const src_bits_per_pixel = RaylibSIMD__FormatToBitsPerPixel(srcPtr->format);
int const src_bytes_per_pixel = src_bits_per_pixel / 8;
int const dest_bits_per_pixel = RaylibSIMD__FormatToBitsPerPixel(dst->format);
int const dest_bytes_per_pixel = dest_bits_per_pixel / 8;
int const src_bytes_per_simd_write = PIXELS_PER_SIMD_WRITE * src_bytes_per_pixel;
int const dest_bytes_per_simd_write = PIXELS_PER_SIMD_WRITE * bytesPerPixelDst;
int const dest_bytes_per_simd_write = PIXELS_PER_SIMD_WRITE * dest_bytes_per_pixel;
int const simd_iterations = RS_CAST(int) srcRec.width / PIXELS_PER_SIMD_WRITE; // NOTE: Divison here rounds down fractional pixels
int const total_simd_pixels = simd_iterations * PIXELS_PER_SIMD_WRITE;
@ -599,15 +613,16 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
__m128 src0123_b = _mm_cvtepi32_ps(src0123_b_int);
__m128 src0123_a = _mm_cvtepi32_ps(src0123_a_int);
// NOTE: For images without an alpha component the src_alpha_min_4x is set to 255 to completely overwrite dest.
// For images with an alpha component the src_alpha_min_4x is set to 0 (i.e. no-op)
src0123_a = _mm_max_ps(src0123_a, src_alpha_min_4x);
__m128 dest0123_r = _mm_cvtepi32_ps(dest0123_r_int);
__m128 dest0123_g = _mm_cvtepi32_ps(dest0123_g_int);
__m128 dest0123_b = _mm_cvtepi32_ps(dest0123_b_int);
__m128 dest0123_a = _mm_cvtepi32_ps(dest0123_a_int);
// NOTE: For images without an alpha component the src_alpha_min_4x is set to 255 to completely overwrite dest.
// For images with an alpha component the src_alpha_min_4x is set to 0 (i.e. no-op)
src0123_a = _mm_max_ps(src0123_a, src_alpha_min_4x);
dest0123_a = _mm_max_ps(dest0123_a, dest_alpha_min_4x);
// NOTE: Source Pixels to Normalized [0, 1] Float Space
__m128 src0123_r01 = _mm_mul_ps(src0123_r, src_r_to_01_coefficient);
__m128 src0123_g01 = _mm_mul_ps(src0123_g, src_g_to_01_coefficient);
@ -628,30 +643,35 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
// NOTE: Porter Duff Blend
// NOTE: Blend Alpha
// i.e. blend_a = src_a + (dest_a * (1 - src_a))
__m128 blend0123_a01 = _mm_add_ps(src0123_tinted_a01, _mm_mul_ps(dest0123_a01, _mm_sub_ps(one_4x, src0123_tinted_a01)));
__m128 inv_blend0123_a01 = _mm_div_ps(one_4x, blend0123_a01);
// i.e. blend_a = src_a + (dest_a * (1 - src_a)) / blend_a
__m128 blend0123_a01 = _mm_add_ps(src0123_tinted_a01, _mm_mul_ps(dest0123_a01, _mm_sub_ps(one_4x, src0123_tinted_a01)));
__m128 inv_blend0123_a01 = _mm_rcp_ps(blend0123_a01);
// (dest_a * (1 - src a) / blend_a)
__m128 one_minus_src0123_tinted_a01 = _mm_sub_ps(one_4x, src0123_tinted_a01);
__m128 blend_rhs = _mm_mul_ps(_mm_mul_ps(dest0123_a01, _mm_mul_ps(dest0123_a01, one_minus_src0123_tinted_a01)), inv_blend0123_a01);
// NOTE: Blend Colors
// i.e. blend_r = ((src_r * a) + (dest_r * dest_a * (1.f - src_a))) / blend_a;
__m128 blend0123_r01 = _mm_mul_ps(_mm_add_ps(_mm_mul_ps(src0123_tinted_r01, src0123_tinted_a01), _mm_mul_ps(dest0123_r01, _mm_mul_ps(dest0123_a01, _mm_sub_ps(one_4x, src0123_tinted_a01)))), inv_blend0123_a01);
__m128 blend0123_g01 = _mm_mul_ps(_mm_add_ps(_mm_mul_ps(src0123_tinted_g01, src0123_tinted_a01), _mm_mul_ps(dest0123_g01, _mm_mul_ps(dest0123_a01, _mm_sub_ps(one_4x, src0123_tinted_a01)))), inv_blend0123_a01);
__m128 blend0123_b01 = _mm_mul_ps(_mm_add_ps(_mm_mul_ps(src0123_tinted_b01, src0123_tinted_a01), _mm_mul_ps(dest0123_b01, _mm_mul_ps(dest0123_a01, _mm_sub_ps(one_4x, src0123_tinted_a01)))), inv_blend0123_a01);
__m128 blend0123_r01 = _mm_add_ps(_mm_mul_ps(src0123_tinted_r01, src0123_tinted_a01), _mm_mul_ps(dest0123_r01, blend_rhs));
__m128 blend0123_g01 = _mm_add_ps(_mm_mul_ps(src0123_tinted_g01, src0123_tinted_a01), _mm_mul_ps(dest0123_g01, blend_rhs));
__m128 blend0123_b01 = _mm_add_ps(_mm_mul_ps(src0123_tinted_b01, src0123_tinted_a01), _mm_mul_ps(dest0123_b01, blend_rhs));
// NOTE: Convert Blend to [0, 255] F32 Space
__m128 blend0123_a = _mm_mul_ps(blend0123_a01, u255_4x);
__m128 blend0123_r = _mm_mul_ps(blend0123_r01, u255_4x);
__m128 blend0123_g = _mm_mul_ps(blend0123_g01, u255_4x);
__m128 blend0123_b = _mm_mul_ps(blend0123_b01, u255_4x);
// NOTE: Convert Blend to F32 Space for Pixel Format
// i.e. For RGBA8888 to [0-255], RGBA4444 to [0-16] .. etc.
__m128 blend0123_a = _mm_mul_ps(blend0123_a01, dest_a01_to_pixel_format_coefficient);
__m128 blend0123_r = _mm_mul_ps(blend0123_r01, dest_r01_to_pixel_format_coefficient);
__m128 blend0123_g = _mm_mul_ps(blend0123_g01, dest_g01_to_pixel_format_coefficient);
__m128 blend0123_b = _mm_mul_ps(blend0123_b01, dest_b01_to_pixel_format_coefficient);
// NOTE: Convert Blend to [0, 255] Integer Space
// NOTE: Convert Blend to Integer Space
__m128i blended0123_a_int = _mm_cvtps_epi32(blend0123_a);
__m128i blended0123_r_int = _mm_cvtps_epi32(blend0123_r);
__m128i blended0123_g_int = _mm_cvtps_epi32(blend0123_g);
__m128i blended0123_b_int = _mm_cvtps_epi32(blend0123_b);
// NOTE: Repack The Pixel
// From {RRRR} {GGGG} {BBBB} {AAAA} to {ABGR ABGR ABGR ABGR}
// From {RRRR} {GGGG} {BBBB} {AAAA} to target format, i.e. for RGBA8888 {ABGR ABGR ABGR ABGR}
// Each blend has the color component converted to 8 bits sitting in the low bits of the SIMD lane.
// Shift the colors into place and or them together to get the final output
//
@ -661,11 +681,15 @@ void RaylibSIMD_ImageDraw(Image *dst, Image src, Rectangle srcRec, Rectangle dst
// blended0123_b_int = {[0,0,0,A], [0,0,0,A], [0,0,0,A], [0,0,0,A]}
// pixel0123 = {[A,B,G,R], [A,B,G,R], [A,B,G,R], [A,B,G,R]}
//
__m128i pixel0123 =
_mm_or_si128(blended0123_r_int,
_mm_or_si128(_mm_or_si128(_mm_slli_epi32(blended0123_g_int, 8),
_mm_slli_epi32(blended0123_b_int, 16)),
_mm_slli_epi32(blended0123_a_int, 24)));
__m128i blended0123_a_int_shifted = _mm_slli_epi32(blended0123_a_int, dest_lanes.a_bit_shift);
__m128i blended0123_r_int_shifted = _mm_slli_epi32(blended0123_r_int, dest_lanes.r_bit_shift);
__m128i blended0123_g_int_shifted = _mm_slli_epi32(blended0123_g_int, dest_lanes.g_bit_shift);
__m128i blended0123_b_int_shifted = _mm_slli_epi32(blended0123_b_int, dest_lanes.b_bit_shift);
__m128i pixel0123_ar = _mm_or_si128(blended0123_a_int_shifted, blended0123_r_int_shifted);
__m128i pixel0123_gb = _mm_or_si128(blended0123_g_int_shifted, blended0123_b_int_shifted);
__m128i pixel0123 = _mm_or_si128(pixel0123_ar, pixel0123_gb);
_mm_storeu_si128((__m128i *)dest, pixel0123);
}
@ -864,7 +888,7 @@ void RaylibSIMD_ImageDrawRectangleRec(Image *dst, Rectangle rec, Color color)
int const pixels_per_simd_write = sizeof(__m128i) / bytes_per_pixel;
int const bytes_per_simd_write = pixels_per_simd_write * bytes_per_pixel;
int const simd_iterations = RS_CAST(int)(rec.width * bytes_per_pixel) / sizeof(__m128i);
int const simd_iterations = RS_CAST(int)rec.width / pixels_per_simd_write;
int const remaining_iterations = rec.width - (pixels_per_simd_write * simd_iterations);
int const stride = dst->width * bytes_per_pixel;