Add class updating and managing the shadow map texture

src/CMakeLists.txt

@@ -940,6 +940,7 @@ set( FASTMATH_SOURCES
 	gl/dynlights/gl_dynlight1.cpp
 	gl/dynlights/gl_lightbuffer.cpp
 	gl/dynlights/gl_lightbsp.cpp
+	gl/dynlights/gl_shadowmap.cpp
 	gl/shaders/gl_shader.cpp
 	gl/shaders/gl_texshader.cpp
 	gl/shaders/gl_shaderprogram.cpp

src/gl/dynlights/gl_shadowmap.cpp

@@ -0,0 +1,65 @@
+// 
+//---------------------------------------------------------------------------
+// 1D dynamic shadow maps
+// Copyright(C) 2017 Magnus Norddahl
+// All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see http://www.gnu.org/licenses/
+//
+//--------------------------------------------------------------------------
+//
+
+#include "gl/system/gl_system.h"
+#include "gl/shaders/gl_shader.h"
+#include "gl/dynlights/gl_shadowmap.h"
+#include "gl/dynlights/gl_dynlight.h"
+#include "gl/system/gl_interface.h"
+#include "gl/system/gl_debug.h"
+#include "gl/renderer/gl_renderer.h"
+#include "gl/renderer/gl_postprocessstate.h"
+#include "gl/shaders/gl_shadowmapshader.h"
+#include "r_state.h"
+
+void FShadowMap::Clear()
+{
+	mLightBSP.Clear();
+}
+
+void FShadowMap::Update()
+{
+	TThinkerIterator<ADynamicLight> it(STAT_DLIGHT);
+	while (true)
+	{
+		ADynamicLight *light = it.Next();
+		if (!light) break;
+	}
+
+	FGLDebug::PushGroup("ShadowMap");
+	FGLPostProcessState savedState;
+
+	GLRenderer->mShadowMapShader->Bind();
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, mLightBSP.GetNodesBuffer());
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, mLightBSP.GetSegsBuffer());
+
+	glViewport(0, 0, 1024, 1024);
+	GLRenderer->RenderScreenQuad();
+
+	const auto &viewport = GLRenderer->mScreenViewport;
+	glViewport(viewport.left, viewport.top, viewport.width, viewport.height);
+
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, 0);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, 0);
+
+	FGLDebug::PopGroup();
+}

src/gl/dynlights/gl_shadowmap.h

@@ -0,0 +1,20 @@
+
+#pragma once
+
+#include "gl/dynlights/gl_lightbsp.h"
+
+class FShadowMap
+{
+public:
+	FShadowMap() { }
+	~FShadowMap() { Clear(); }
+
+	void Clear();
+	void Update();
+
+private:
+	FLightBSP mLightBSP;
+
+	FShadowMap(const FShadowMap &) = delete;
+	FShadowMap &operator=(FShadowMap &) = delete;
+};

src/gl/renderer/gl_renderer.h

@@ -6,7 +6,7 @@
 #include "vectors.h"
 #include "r_renderer.h"
 #include "gl/data/gl_matrix.h"
-#include "gl/dynlights/gl_lightbsp.h"
+#include "gl/dynlights/gl_shadowmap.h"
 
 struct particle_t;
 class FCanvasTexture;
@@ -126,7 +126,7 @@ public:
 	FPresent3DRowShader *mPresent3dRowShader;
 	FShadowMapShader *mShadowMapShader;
 
-	FLightBSP mLightBSP;
+	FShadowMap mShadowMap;
 
 	FTexture *gllight;
 	FTexture *glpart2;

src/gl/scene/gl_scene.cpp

@@ -950,6 +950,8 @@ void FGLRenderer::RenderView (player_t* player)
 	TThinkerIterator<ADynamicLight> it(STAT_DLIGHT);
 	GLRenderer->mLightCount = ((it.Next()) != NULL);
 
+	GLRenderer->mShadowMap.Update();
+
 	sector_t * viewsector = RenderViewpoint(player->camera, NULL, FieldOfView.Degrees, ratio, fovratio, true, true);
 
 	All.Unclock();

wadsrc/static/shaders/glsl/shadowmap.fp

@@ -112,5 +112,5 @@ float rayTest(vec2 from, vec2 to)
 
 void main()
 {
-	FragColor = vec4(rayTest(vec2(0.0, 0.0), vec2(1.0, 1.0));
+	FragColor = vec4(rayTest(vec2(0.0, 0.0), vec2(1.0, 1.0)));
 }