Move to glfw

1 files changed, 47 insertions, 0 deletions

diff --git a/render.c b/render.c
new file mode 100644
index 0000000..1dc90aa
--- /dev/null
+++ b/render.c
@@ -0,0 +1,47 @@
+
+
+/* [=]===^=[ clear_buffer ]=================================================================^===[=] */
+__attribute__((always_inline, hot))
+static inline void clear_buffer(void) {
+	// PROFILE_FUNCTION();
+	memset(buffer, 0, sizeof(buffer));
+}
+
+/* [=]===^=[ set_decay ]=================================================================^===[=] */
+static uint16_t _old_weight;
+static uint16_t _new_weight;
+static void set_decay(uint16_t old_weight) {
+	_old_weight = old_weight ? (old_weight > 256 ? 256 : old_weight) : 0;
+	_new_weight = 256 - old_weight;
+}
+
+/* [=]===^=[ apply_phosphor_decay ]=================================================================^===[=] */
+__attribute__((always_inline, hot))
+static inline void apply_phosphor_decay(void) {
+	// PROFILE_FUNCTION();
+	__m256i old_weight = _mm256_set1_epi16(_old_weight);
+	__m256i new_weight = _mm256_set1_epi16(_new_weight);
+	__m128i alpha_mask = _mm_set1_epi32(0x000000ff);
+	uint32_t * restrict src = buffer;
+	uint32_t * restrict dst = display_buffer;
+
+	for(uint32_t y = 0; y < BUFFER_HEIGHT; ++y, src += BUFFER_WIDTH, dst += BUFFER_WIDTH) {
+		for(uint32_t x = 0; x < BUFFER_WIDTH; x += 4) {
+			_mm_prefetch((char*)&src[x + 2 * BUFFER_WIDTH], _MM_HINT_T0);
+			_mm_prefetch((char*)&dst[x + 2 * BUFFER_WIDTH], _MM_HINT_T0);
+
+			__m128i new_pixels = _mm_loadu_si128((__m128i*)&src[x]);
+			__m128i old_pixels = _mm_loadu_si128((__m128i*)&dst[x]);
+
+			__m256i old_lo = _mm256_cvtepu8_epi16(old_pixels);
+			__m256i new_lo = _mm256_cvtepu8_epi16(new_pixels);
+
+			__m256i blended = _mm256_adds_epu16(_mm256_mullo_epi16(old_lo, old_weight), _mm256_mullo_epi16(new_lo, new_weight));
+			blended = _mm256_srli_epi16(blended, 8);
+
+			__m128i final_pixels = _mm_packus_epi16(_mm256_castsi256_si128(blended), _mm256_extracti128_si256(blended, 1));
+			final_pixels = _mm_or_si128(final_pixels, _mm_and_si128(old_pixels, alpha_mask));
+			_mm_storeu_si128((__m128i*)&dst[x], final_pixels);
+		}
+	}
+}