From 200ecb6b75b266bbace45e68aa9139a942c4896b Mon Sep 17 00:00:00 2001
From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sat, 16 Nov 2002 13:35:36 +0000
Subject: [PATCH] merged GL_DrawRangeElements into R_Mesh_Draw for a mild speed
 gain

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2631 d7cf8633-e32d-0410-b094-e92efae38249
---
 gl_backend.c | 60 +++++++++++++++++++++++-----------------------------
 gl_backend.h |  2 --
 2 files changed, 26 insertions(+), 36 deletions(-)

diff --git a/gl_backend.c b/gl_backend.c
index a6648711..a815ba62 100644
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -528,35 +528,6 @@ void GL_ConvertColorsFloatToByte(int numverts)
 	}
 }
 
-void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, const int *index)
-{
-	int arraylocked = false;
-	c_meshs++;
-	c_meshelements += indexcount;
-	if (indexcount == 0 || endvert == firstvert)
-	{
-		Con_Printf("GL_DrawRangeElements(%d, %d, %d, %08p);\n", firstvert, endvert, indexcount, index);
-		return;
-	}
-	if (gl_supportslockarrays && gl_lockarrays.integer)
-	{
-		qglLockArraysEXT(firstvert, endvert - firstvert);
-		CHECKGLERROR
-		arraylocked = true;
-	}
-	if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
-		qglDrawRangeElements(GL_TRIANGLES, firstvert, endvert, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
-	else
-		qglDrawElements(GL_TRIANGLES, indexcount, GL_UNSIGNED_INT, (const GLuint *) index);
-	CHECKGLERROR
-	if (arraylocked)
-	{
-		qglUnlockArraysEXT();
-		CHECKGLERROR
-		arraylocked = false;
-	}
-}
-
 // enlarges geometry buffers if they are too small
 void _R_Mesh_ResizeCheck(int numverts)
 {
@@ -571,15 +542,36 @@ void _R_Mesh_ResizeCheck(int numverts)
 // renders the mesh
 void R_Mesh_Draw(int numverts, int numtriangles, const int *elements)
 {
-	BACKENDACTIVECHECK
-
-	CHECKGLERROR
-
+	int numelements;
+	if (numtriangles == 0 || numverts == 0)
+	{
+		Con_Printf("R_Mesh_Draw(%d, %d, %08p);\n", numverts, numtriangles, elements);
+		return;
+	}
+	numelements = numtriangles * 3;
+	c_meshs++;
+	c_meshelements += numelements;
 	if (gl_state.colorarray && !gl_mesh_floatcolors.integer)
 		GL_ConvertColorsFloatToByte(numverts);
 	if (!r_render.integer)
 		return;
-	GL_DrawRangeElements(0, numverts, numtriangles * 3, elements);
+	if (gl_supportslockarrays && gl_lockarrays.integer)
+	{
+		qglLockArraysEXT(0, numverts);
+		CHECKGLERROR
+		if (gl_mesh_drawrangeelements.integer && qglDrawRangeElements != NULL)
+			qglDrawRangeElements(GL_TRIANGLES, 0, numverts, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		else
+			qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		CHECKGLERROR
+		qglUnlockArraysEXT();
+		CHECKGLERROR
+	}
+	else
+	{
+		qglDrawElements(GL_TRIANGLES, numelements, GL_UNSIGNED_INT, (const GLuint *) elements);
+		CHECKGLERROR
+	}
 }
 
 // restores backend state, used when done with 3D rendering
diff --git a/gl_backend.h b/gl_backend.h
index f26fa654..143b0f24 100644
--- a/gl_backend.h
+++ b/gl_backend.h
@@ -7,8 +7,6 @@
 #define POLYGONELEMENTS_MAXPOINTS 258
 extern int polygonelements[768];
 
-void GL_DrawRangeElements(int firstvert, int endvert, int indexcount, const int *index);
-
 void GL_SetupView_ViewPort (int x, int y, int width, int height);
 void GL_SetupView_Orientation_Identity (void);
 void GL_SetupView_Orientation_FromEntity (vec3_t origin, vec3_t angles);
-- 
2.39.2