From 7400694e8106c2b2accf033d35ffbd202e77bab0 Mon Sep 17 00:00:00 2001
From: Marco Cawthorne <marco@vera-visions.com>
Date: Sun, 16 Jul 2023 13:28:41 -0700
Subject: [PATCH] Add new cvar: r_drawGLQuakeShadow

---
 platform/cvars.cfg               | 12 ++++++++++++
 src/shared/NSMoverEntity.qc      | 16 ++++++++++++++++
 src/shared/NSRenderableEntity.qc | 26 ++++++++++++++++++++++++++
 src/shared/NSTalkMonster.qc      |  1 +
 4 files changed, 55 insertions(+)

diff --git a/platform/cvars.cfg b/platform/cvars.cfg
index df6fc3ac..e29321fa 100644
--- a/platform/cvars.cfg
+++ b/platform/cvars.cfg
@@ -39,6 +39,18 @@ seta g_mapCycle "mapcycle.txt"	// Map cycle file for multiplayer games.
 // input console variables
 seta in_zoomSensitivity 1.0 // Mouse sensitivity multiplier for when we're using the +zoomin command.
 
+// rendering related cvars
+seta r_drawGLQuakeShadow 0		// Draws a GLQuake styled shadow under certain entities when enabled.
+seta r_skipBeams 0				// Skip rendering of beam effects.
+seta r_skipDiffuse 0			// Skip rendering of diffuse/albedo textures.
+seta r_skipGlows 0				// Skip rendering of coronas/glow sprite effects.
+seta r_skipLensFlares 0			// Skip rendering of lens flares.
+seta r_skipLightmap 0			// Skip rendering of the lightmap in levels.
+seta r_skipDetail 0				// Skip rendering of detail textures on surfaces.
+seta r_skipEnvmap 0				// Skip rendering of environment/cube maps on surfaces.
+seta r_skipFullbright 0			// Skip rendering of fullbright textures on surfaces.
+seta r_skipNormal 0				// Skip rendering of normal/bump maps on surfaces.
+
 // aliases for the older commands (may be removed some day)
 alias cl_autojump pm_autoJump
 alias cl_showfps com_showFPS
diff --git a/src/shared/NSMoverEntity.qc b/src/shared/NSMoverEntity.qc
index 1d904bee..8777d025 100644
--- a/src/shared/NSMoverEntity.qc
+++ b/src/shared/NSMoverEntity.qc
@@ -1,3 +1,19 @@
+/*
+ * Copyright (c) 2023 Vera Visions LLC.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
 void
 NSMoverEntity::NSMoverEntity(void)
 {
diff --git a/src/shared/NSRenderableEntity.qc b/src/shared/NSRenderableEntity.qc
index d8e45a25..e86bff3f 100644
--- a/src/shared/NSRenderableEntity.qc
+++ b/src/shared/NSRenderableEntity.qc
@@ -545,6 +545,30 @@ NSRenderableEntity::RenderAxialScale(void)
 	}
 }
 
+void
+NSRenderableEntity::RenderGLQuakeShadow(void)
+{
+	vector oldOrigin = origin;
+
+	if (autocvar(r_drawGLQuakeShadow, 0) == 0)
+		return;
+
+	if (effects & EF_NOSHADOW)
+		return;
+
+	if (m_bIsBrush == true)
+		return;
+
+	traceline(origin + [0, 0, 1], origin + [0, 0, -1024], MOVE_NORMAL, this);
+	origin = trace_endpos + [0,0,1];
+	makevectors(angles);
+	v_up *= 0.01;
+	renderflags = RF_USEAXIS;
+	alpha = 0.5f;
+	addentity_lighting(this, [0,0,0], [0, 0, 0], [0,0,0], 0, 0);
+	origin = oldOrigin;
+}
+
 /*
 ============
 NSRenderableEntity::predraw
@@ -596,6 +620,8 @@ NSRenderableEntity::predraw(void)
 	}
 	oldorigin = origin;
 
+	RenderGLQuakeShadow();
+
 	return (PREDRAW_NEXT);
 }
 #endif
diff --git a/src/shared/NSTalkMonster.qc b/src/shared/NSTalkMonster.qc
index b48ec093..cc5e13a2 100644
--- a/src/shared/NSTalkMonster.qc
+++ b/src/shared/NSTalkMonster.qc
@@ -972,6 +972,7 @@ NSTalkMonster::predraw(void)
 
 	addentity(this);
 	_RenderDebugViewCone();
+	RenderGLQuakeShadow();
 
 	return (PREDRAW_NEXT);
 }