Merge branch 'shadowmaps' of https://github.com/raa-eruanna/qzdoom into 3.0_work

# Conflicts:
#	src/CMakeLists.txt
#	wadsrc/static/language.enu

src/gl/shaders/gl_shader.cpp

@@ -105,6 +105,11 @@ bool FShader::Load(const char * name, const char * vert_prog_lump, const char *
 		vp_comb << "#define USE_QUAD_DRAWER\n";
 	}
 
+	if (!!(gl.flags & RFL_SHADER_STORAGE_BUFFER))
+	{
+		vp_comb << "#define SUPPORTS_SHADOWMAPS\n";
+	}
+
 	vp_comb << defines << i_data.GetString().GetChars();
 	FString fp_comb = vp_comb;
 
@@ -270,6 +275,9 @@ bool FShader::Load(const char * name, const char * vert_prog_lump, const char *
 		if (tempindex > 0) glUniform1i(tempindex, i - 1);
 	}
 
+	int shadowmapindex = glGetUniformLocation(hShader, "ShadowMap");
+	if (shadowmapindex > 0) glUniform1i(shadowmapindex, 16);
+
 	glUseProgram(0);
 	return !!linked;
 }

src/gl/shaders/gl_shadowmapshader.cpp

@@ -0,0 +1,45 @@
+// 
+//---------------------------------------------------------------------------
+//
+// Copyright(C) 2016 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 "files.h"
+#include "m_swap.h"
+#include "v_video.h"
+#include "gl/gl_functions.h"
+#include "vectors.h"
+#include "gl/system/gl_interface.h"
+#include "gl/system/gl_framebuffer.h"
+#include "gl/system/gl_cvars.h"
+#include "gl/shaders/gl_shadowmapshader.h"
+
+void FShadowMapShader::Bind()
+{
+	if (!mShader)
+	{
+		mShader.Compile(FShaderProgram::Vertex, "shaders/glsl/screenquad.vp", "", 430);
+		mShader.Compile(FShaderProgram::Fragment, "shaders/glsl/shadowmap.fp", "", 430);
+		mShader.SetFragDataLocation(0, "FragColor");
+		mShader.Link("shaders/glsl/shadowmap");
+		mShader.SetAttribLocation(0, "PositionInProjection");
+	}
+	mShader.Bind();
+}

src/gl/shaders/gl_shadowmapshader.h

@@ -0,0 +1,15 @@
+#ifndef __GL_SHADOWMAPSHADER_H
+#define __GL_SHADOWMAPSHADER_H
+
+#include "gl_shaderprogram.h"
+
+class FShadowMapShader
+{
+public:
+	void Bind();
+
+private:
+	FShaderProgram mShader;
+};
+
+#endif