First SSE2-accelerated alpha blit
This commit is contained in:
K. Lange
Kevin Lange
parent
ecafad3bea
commit
9f6c409d2d
132
lib/graphics.c
132
lib/graphics.c
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@ -17,6 +17,9 @@
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#include <stdio.h>
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#include <math.h>
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#include <xmmintrin.h>
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#include <emmintrin.h>
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#include <kernel/video.h>
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#include <toaru/graphics.h>
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@ -547,10 +550,14 @@ void load_sprite(sprite_t * sprite, char * filename) {
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(bufferb[i+1 + 3 * x] & 0xFF) * 0x100 +
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(bufferb[i+2 + 3 * x] & 0xFF) * 0x10000;
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} else if (bpp == 32) {
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color = (bufferb[i + 4 * x] & 0xFF) * 0x1000000 +
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(bufferb[i+1 + 4 * x] & 0xFF) * 0x1 +
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(bufferb[i+2 + 4 * x] & 0xFF) * 0x100 +
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(bufferb[i+3 + 4 * x] & 0xFF) * 0x10000;
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if (bufferb[i + 4 * x] == 0) {
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color = 0x000000;
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} else {
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color = (bufferb[i + 4 * x] & 0xFF) * 0x1000000 +
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(bufferb[i+1 + 4 * x] & 0xFF) * 0x1 +
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(bufferb[i+2 + 4 * x] & 0xFF) * 0x100 +
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(bufferb[i+3 + 4 * x] & 0xFF) * 0x10000;
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}
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}
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/* Set our point */
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sprite->bitmap[(height - y - 1) * width + x] = color;
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@ -563,25 +570,124 @@ _cleanup_sprite:
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free(bufferb);
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}
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static __m128i mask00ff;
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static __m128i mask0080;
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static __m128i mask0101;
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__attribute__((constructor)) static void _masks(void) {
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mask00ff = _mm_set1_epi16(0x00FF);
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mask0080 = _mm_set1_epi16(0x0080);
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mask0101 = _mm_set1_epi16(0x0101);
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}
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__attribute__((__force_align_arg_pointer__))
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void draw_sprite(gfx_context_t * ctx, sprite_t * sprite, int32_t x, int32_t y) {
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int32_t _left = max(x, 0);
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int32_t _top = max(y, 0);
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int32_t _right = min(x + sprite->width, ctx->width - 1);
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int32_t _bottom = min(y + sprite->height, ctx->height - 1);
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for (uint16_t _y = 0; _y < sprite->height; ++_y) {
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if (!_is_in_clip(ctx, y + _y)) continue;
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for (uint16_t _x = 0; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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if (sprite->alpha == ALPHA_MASK) {
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if (sprite->alpha == ALPHA_MASK) {
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for (uint16_t _y = 0; _y < sprite->height; ++_y) {
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if (!_is_in_clip(ctx, y + _y)) continue;
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for (uint16_t _x = 0; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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GFX(ctx, x + _x, y + _y) = alpha_blend(GFX(ctx, x + _x, y + _y), SPRITE(sprite, _x, _y), SMASKS(sprite, _x, _y));
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} else if (sprite->alpha == ALPHA_EMBEDDED) {
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}
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}
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} else if (sprite->alpha == ALPHA_EMBEDDED) {
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/* Alpha embedded is the most important step. */
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for (uint16_t _y = 0; _y < sprite->height; ++_y) {
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if (!_is_in_clip(ctx, y + _y)) continue;
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#if 0
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for (uint16_t _x = 0; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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GFX(ctx, x + _x, y + _y) = alpha_blend_rgba(GFX(ctx, x + _x, y + _y), SPRITE(sprite, _x, _y));
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} else if (sprite->alpha == ALPHA_INDEXED) {
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}
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#else
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uint16_t _x = 0;
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/* Ensure alignment */
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for (; _x < sprite->width && ((uintptr_t)&GFX(ctx, x + _x, y + _y) & 15); ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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GFX(ctx, x + _x, y + _y) = alpha_blend_rgba(GFX(ctx, x + _x, y + _y), SPRITE(sprite, _x, _y));
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}
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for (; _x < sprite->width - 3; _x += 4) {
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if (x + _x < _left || x + _x + 3 > _right || y + _y < _top || y + _y > _bottom) {
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continue;
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}
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__m128i d = _mm_load_si128((void *)&GFX(ctx, x + _x, y + _y));
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__m128i s = _mm_loadu_si128((void *)&SPRITE(sprite, _x, _y));
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// clear
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if (_mm_movemask_epi8(_mm_cmpeq_epi8(s, _mm_setzero_si128())) == 0xFFFF)
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continue;
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// opaque
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if (_mm_movemask_epi8(_mm_cmpeq_epi8(s, _mm_cmpeq_epi8(s,s))) & 0x8888 == 0x8888)
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_mm_storeu_si128((void*)&GFX(ctx, x + _x, y + _y), s);
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__m128i d_l, d_h;
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__m128i s_l, s_h;
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// unpack destination
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d_l = _mm_unpacklo_epi8(d, _mm_setzero_si128());
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d_h = _mm_unpackhi_epi8(d, _mm_setzero_si128());
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// unpack source
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s_l = _mm_unpacklo_epi8(s, _mm_setzero_si128());
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s_h = _mm_unpackhi_epi8(s, _mm_setzero_si128());
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__m128i a_l, a_h;
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__m128i t_l, t_h;
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// extract source alpha RGBA → AAAA
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a_l = _mm_shufflehi_epi16(_mm_shufflelo_epi16(s_l, _MM_SHUFFLE(3,3,3,3)), _MM_SHUFFLE(3,3,3,3));
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a_h = _mm_shufflehi_epi16(_mm_shufflelo_epi16(s_h, _MM_SHUFFLE(3,3,3,3)), _MM_SHUFFLE(3,3,3,3));
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// negate source alpha
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t_l = _mm_xor_si128(a_l, mask00ff);
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t_h = _mm_xor_si128(a_h, mask00ff);
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// apply source alpha to destination
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d_l = _mm_mulhi_epu16(_mm_adds_epu16(_mm_mullo_epi16(d_l,t_l),mask0080),mask0101);
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d_h = _mm_mulhi_epu16(_mm_adds_epu16(_mm_mullo_epi16(d_h,t_h),mask0080),mask0101);
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// combine source and destination
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d_l = _mm_adds_epu8(s_l,d_l);
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d_h = _mm_adds_epu8(s_h,d_h);
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// pack low + high and write back to memory
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_mm_storeu_si128((void*)&GFX(ctx, x + _x, y + _y), _mm_packus_epi16(d_l,d_h));
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}
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for (; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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GFX(ctx, x + _x, y + _y) = alpha_blend_rgba(GFX(ctx, x + _x, y + _y), SPRITE(sprite, _x, _y));
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}
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#endif
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}
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} else if (sprite->alpha == ALPHA_INDEXED) {
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for (uint16_t _y = 0; _y < sprite->height; ++_y) {
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if (!_is_in_clip(ctx, y + _y)) continue;
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for (uint16_t _x = 0; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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if (SPRITE(sprite, _x, _y) != sprite->blank) {
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GFX(ctx, x + _x, y + _y) = SPRITE(sprite, _x, _y) | 0xFF000000;
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}
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} else {
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}
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}
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} else {
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for (uint16_t _y = 0; _y < sprite->height; ++_y) {
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if (!_is_in_clip(ctx, y + _y)) continue;
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for (uint16_t _x = 0; _x < sprite->width; ++_x) {
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if (x + _x < _left || x + _x > _right || y + _y < _top || y + _y > _bottom)
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continue;
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GFX(ctx, x + _x, y + _y) = SPRITE(sprite, _x, _y) | 0xFF000000;
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}
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}
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