- put all the common part of buffer based drawing into a separate method of the vertex buffer.

src/gl/data/gl_vertexbuffer.h

@@ -70,6 +70,14 @@ public:
 		mCurIndex = newofs;
 		return diff;
 	}
+#ifdef __GL_PCH_H	// we need the system includes for this but we cannot include them ourselves without creating #define clashes. The affected files wouldn't try to draw anyway.
+	void RenderCurrent(FFlatVertex *newptr, unsigned int primtype)
+	{
+		unsigned int offset;
+		unsigned int count = GetCount(newptr, &offset);
+		glDrawArrays(primtype, offset, count);
+	}
+#endif
 	void Reset()
 	{
 		mCurIndex = mIndex;

src/gl/scene/gl_decal.cpp

@@ -355,9 +355,7 @@ void GLWall::DrawDecal(DBaseDecal *decal)
 			ptr->Set(dv[i].x, dv[i].z, dv[i].y, dv[i].u, dv[i].v);
 			ptr++;
 		}
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 	rendered_decals++;
 	gl_RenderState.SetTextureMode(TM_MODULATE);

src/gl/scene/gl_drawinfo.cpp

@@ -1011,9 +1011,7 @@ void FDrawInfo::SetupFloodStencil(wallseg * ws)
 		ptr++;
 		ptr->Set(ws->x2, ws->z1, ws->y2, 0, 0);
 		ptr++;
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 
 	glStencilFunc(GL_EQUAL,recursion+1,~0);		// draw sky into stencil
@@ -1055,9 +1053,7 @@ void FDrawInfo::ClearFloodStencil(wallseg * ws)
 		ptr++;
 		ptr->Set(ws->x2, ws->z1, ws->y2, 0, 0);
 		ptr++;
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 
 	// restore old stencil op.
@@ -1158,9 +1154,7 @@ void FDrawInfo::DrawFloodedPlane(wallseg * ws, float planez, sector_t * sec, boo
 		ptr++;
 		ptr->Set(px4, planez, py4, px4 / 64, -py4 / 64);
 		ptr++;
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 
 	if (pushed)

src/gl/scene/gl_flats.cpp

@@ -295,9 +295,7 @@ void GLFlat::DrawSubsector(subsector_t * sub)
 				ptr++;
 			}
 		}
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 
 	flatvertices += sub->numlines;

src/gl/scene/gl_scene.cpp

@@ -637,9 +637,7 @@ static void FillScreen()
 		ptr++;
 		ptr->Set((float)SCREENWIDTH, (float)SCREENHEIGHT, 0, 0, 0);
 		ptr++;
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_STRIP);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 	}
 }
 

src/gl/scene/gl_walls_draw.cpp

@@ -302,9 +302,7 @@ void GLWall::RenderWall(int textured, float * color2, ADynamicLight * light)
 		ptr->Set(glseg.x2, zbottom[1], glseg.y2, tcs[3].u, tcs[3].v);
 		ptr++;
 		if (split && !(flags & GLWF_NOSPLITLOWER)) SplitLowerEdge(tcs, ptr);
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_FAN);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_FAN, offset, count);
 		vertexcount += 4;
 	}
 

src/gl/scene/gl_weapon.cpp

@@ -174,9 +174,7 @@ void FGLRenderer::DrawPSprite (player_t * player,pspdef_t *psp,fixed_t sx, fixed
 		ptr++;
 		ptr->Set(x2, y2, 0, fU2, fV2);
 		ptr++;
-		unsigned int offset;
+		GLRenderer->mVBO->RenderCurrent(ptr, GL_TRIANGLE_STRIP);
-		unsigned int count = GLRenderer->mVBO->GetCount(ptr, &offset);
-		glDrawArrays(GL_TRIANGLE_STRIP, offset, count);
 	}
 	if (tex->GetTransparent() || OverrideShader != 0)
 	{