From 4f18b24132ebeb49f4de32a7c8a34d50d4b85caf Mon Sep 17 00:00:00 2001
From: Gleb Mazovetskiy <glex.spb@gmail.com>
Date: Mon, 19 Aug 2024 23:15:05 +0100
Subject: [PATCH] dun_render: Specialized FullyDark+Solid triangles

Eliminates regression in the rendering speed of such triangles.
---
 Source/engine/render/dun_render.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/Source/engine/render/dun_render.cpp b/Source/engine/render/dun_render.cpp
index 309d8db3887..89480126679 100644
--- a/Source/engine/render/dun_render.cpp
+++ b/Source/engine/render/dun_render.cpp
@@ -495,6 +495,19 @@ DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderTriangleLower(uint8_t *DVL_RESTRI
 	dst -= 16 * dstLineOffset;
 }
 
+template <>
+DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderTriangleLower<LightType::FullyDark, /*Transparent=*/false>(uint8_t *DVL_RESTRICT &dst, ptrdiff_t dstLineOffset, const uint8_t *DVL_RESTRICT &src, [[maybe_unused]] const uint8_t *DVL_RESTRICT tbl)
+{
+	unsigned width = XStep;
+	for (unsigned i = 0; i < LowerHeight; ++i) {
+		BlitFillDirect(dst, width, 0);
+		dst -= dstLineOffset;
+		width += XStep;
+	}
+	src += 272;
+	dst -= 16 * dstLineOffset;
+}
+
 template <LightType Light, bool Transparent>
 DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderTriangleUpper(uint8_t *DVL_RESTRICT dst, ptrdiff_t dstLineOffset, const uint8_t *DVL_RESTRICT src, const uint8_t *DVL_RESTRICT tbl)
 {
@@ -515,6 +528,17 @@ DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderTriangleUpper(uint8_t *DVL_RESTRI
 	RenderLineTransparentOrOpaque<Light, Transparent>(dst - 14 * dstLineOffset, src + 238, 2, tbl);
 }
 
+template <>
+DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderTriangleUpper<LightType::FullyDark, /*Transparent=*/false>(uint8_t *DVL_RESTRICT dst, ptrdiff_t dstLineOffset, [[maybe_unused]] const uint8_t *DVL_RESTRICT src, [[maybe_unused]] const uint8_t *DVL_RESTRICT tbl)
+{
+	unsigned width = XStep;
+	for (unsigned i = 0; i < LowerHeight; ++i) {
+		BlitFillDirect(dst, width, 0);
+		dst -= dstLineOffset;
+		width += XStep;
+	}
+}
+
 template <LightType Light, bool Transparent>
 DVL_ALWAYS_INLINE DVL_ATTRIBUTE_HOT void RenderLeftTriangleLower(uint8_t *DVL_RESTRICT &dst, uint16_t dstPitch, const uint8_t *DVL_RESTRICT &src, const uint8_t *DVL_RESTRICT tbl)
 {