From ee7a4daa8c3548931e43061f1f68e4fe272968e0 Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Wed, 27 Apr 2016 23:19:54 +0200
Subject: [PATCH] - preparations for textured dynamic lights.

---
 src/gl/scene/gl_drawinfo.cpp | 25 +++++++++++++++++++------
 src/gl/scene/gl_drawinfo.h   | 29 +++++++++++++++++++++++++++++
 src/win32/win32gliface.cpp   |  4 +++-
 3 files changed, 51 insertions(+), 7 deletions(-)

diff --git a/src/gl/scene/gl_drawinfo.cpp b/src/gl/scene/gl_drawinfo.cpp
index 386dc6a4a..a444dbe62 100644
--- a/src/gl/scene/gl_drawinfo.cpp
+++ b/src/gl/scene/gl_drawinfo.cpp
@@ -991,10 +991,15 @@ static FDrawInfoList di_list;
 FDrawInfo::FDrawInfo()
 {
 	next = NULL;
+	if (gl.lightmethod == LM_SOFTWARE)
+	{
+		dldrawlists = new GLDrawList[GLLDL_TYPES];
+	}
 }
 
 FDrawInfo::~FDrawInfo()
 {
+	if (dldrawlists != NULL) delete[] dldrawlists;
 	ClearBuffers();
 }
 
@@ -1018,13 +1023,17 @@ void FDrawInfo::StartScene()
 	ss_renderflags.Resize(numsubsectors);
 	no_renderflags.Resize(numsubsectors);
 
-	memset(&sectorrenderflags[0], 0, numsectors*sizeof(sectorrenderflags[0]));
-	memset(&ss_renderflags[0], 0, numsubsectors*sizeof(ss_renderflags[0]));
-	memset(&no_renderflags[0], 0, numnodes*sizeof(no_renderflags[0]));
+	memset(&sectorrenderflags[0], 0, numsectors * sizeof(sectorrenderflags[0]));
+	memset(&ss_renderflags[0], 0, numsubsectors * sizeof(ss_renderflags[0]));
+	memset(&no_renderflags[0], 0, numnodes * sizeof(no_renderflags[0]));
 
-	next=gl_drawinfo;
-	gl_drawinfo=this;
-	for(int i=0;i<GLDL_TYPES;i++) drawlists[i].Reset();
+	next = gl_drawinfo;
+	gl_drawinfo = this;
+	for (int i = 0; i < GLDL_TYPES; i++) drawlists[i].Reset();
+	if (dldrawlists != NULL)
+	{
+		for (int i = 0; i < GLLDL_TYPES; i++) dldrawlists[i].Reset();
+	}
 }
 
 //==========================================================================
@@ -1037,6 +1046,10 @@ void FDrawInfo::EndDrawInfo()
 	FDrawInfo * di = gl_drawinfo;
 
 	for(int i=0;i<GLDL_TYPES;i++) di->drawlists[i].Reset();
+	if (di->dldrawlists != NULL)
+	{
+		for (int i = 0; i < GLLDL_TYPES; i++) di->dldrawlists[i].Reset();
+	}
 	gl_drawinfo=di->next;
 	di_list.Release(di);
 }
diff --git a/src/gl/scene/gl_drawinfo.h b/src/gl/scene/gl_drawinfo.h
index 8cb6a412a..1eb4882ef 100644
--- a/src/gl/scene/gl_drawinfo.h
+++ b/src/gl/scene/gl_drawinfo.h
@@ -25,6 +25,28 @@ enum DrawListType
 	GLDL_TYPES,
 };
 
+// more lists for handling of dynamic lights
+enum DLDrawListType
+{
+	// These are organized so that the various multipass rendering modes have to be set as few times as possible
+	GLLDL_WALLS_PLAIN,			// dynamic lights on normal walls
+	GLLDL_WALLS_BRIGHT,			// dynamic lights on brightmapped walls
+	GLLDL_WALLS_MASKED,			// dynamic lights on masked midtextures
+
+	GLLDL_FLATS_PLAIN,			// dynamic lights on normal flats
+	GLLDL_FLATS_BRIGHT,			// dynamic lights on brightmapped flats
+	GLLDL_FLATS_MASKED,			// dynamic lights on masked flats
+
+	GLLDL_WALLS_FOG,			// lights on fogged walls
+	GLLDL_WALLS_FOGMASKED,		// lights on fogged masked midtextures
+
+	GLLDL_FLATS_FOG,			// lights on fogged walls
+	GLLDL_FLATS_FOGMASKED,		// lights on fogged masked midtextures
+
+	GLLDL_TYPES,
+};
+
+
 enum Drawpasses
 {
 	GLPASS_ALL,			// Main pass with dynamic lights
@@ -32,6 +54,12 @@ enum Drawpasses
 	GLPASS_PLAIN,		// Main pass without dynamic lights
 	GLPASS_DECALS,		// Draws a decal
 	GLPASS_TRANSLUCENT,	// Draws translucent objects
+
+	// these are only used with texture based dynamic lights
+	GLPASS_BASE,		// untextured base for dynamic lights
+	GLPASS_LIGHTTEX,	// lighttexture pass
+	GLPASS_TEXONLY		// finishing texture pass
+
 };
 
 //==========================================================================
@@ -199,6 +227,7 @@ struct FDrawInfo
 
 	FDrawInfo * next;
 	GLDrawList drawlists[GLDL_TYPES];
+	GLDrawList *dldrawlists;	// only gets allocated when needed.
 
 	FDrawInfo();
 	~FDrawInfo();
diff --git a/src/win32/win32gliface.cpp b/src/win32/win32gliface.cpp
index 76099babb..625bda2a7 100644
--- a/src/win32/win32gliface.cpp
+++ b/src/win32/win32gliface.cpp
@@ -804,6 +804,8 @@ bool Win32GLVideo::InitHardware (HWND Window, int multisample)
 					0
 				};
 
+				//Printf("Trying to create an OpenGL %d.%d %s profile context\n", versions[i] / 10, versions[i] % 10, prof == WGL_CONTEXT_CORE_PROFILE_BIT_ARB ? "Core" : "Compatibility");
+
 				m_hRC = myWglCreateContextAttribsARB(m_hDC, 0, ctxAttribs);
 				if (m_hRC != NULL) break;
 			}
@@ -832,7 +834,7 @@ bool Win32GLVideo::InitHardware (HWND Window, int multisample)
 		}
 	}
 	// We get here if the driver doesn't support the modern context creation API which always means an old driver.
-	I_Error ("R_OPENGL: Unable to create an OpenGL render context.\n");
+	I_Error ("R_OPENGL: Unable to create an OpenGL render context. Insufficient driver support for context creation\n");
 	return false;
 }