From a936629cec470e3c4bdf6bfcf9481c6bae39e5ec Mon Sep 17 00:00:00 2001
From: Christoph Oelckers <coelckers@zdoom.fake>
Date: Thu, 10 Jul 2014 10:33:07 +0200
Subject: [PATCH] - use default fragment shader for burn and stencil shader,
 with the time consuming parts disabled by a #define, to avoid code
 duplication.

---
 src/gl/shaders/gl_shader.cpp          | 25 +++++++++++++++++++++++--
 wadsrc/static/shaders/glsl/burn.vp    |  7 -------
 wadsrc/static/shaders/glsl/main.vp    | 21 +++++++++++++++------
 wadsrc/static/shaders/glsl/stencil.vp | 14 --------------
 4 files changed, 38 insertions(+), 29 deletions(-)
 delete mode 100644 wadsrc/static/shaders/glsl/burn.vp
 delete mode 100644 wadsrc/static/shaders/glsl/stencil.vp

diff --git a/src/gl/shaders/gl_shader.cpp b/src/gl/shaders/gl_shader.cpp
index bd96c1ce2..013e56709 100644
--- a/src/gl/shaders/gl_shader.cpp
+++ b/src/gl/shaders/gl_shader.cpp
@@ -212,6 +212,27 @@ bool FShader::Load(const char * name, const char * vert_prog_lump, const char *
 	int texture_index = glGetUniformLocation(hShader, "texture2");
 	if (texture_index > 0) glUniform1i(texture_index, 1);
 
+
+    GLint   binaryLength;
+    void*   binary;
+    FILE*   outfile;
+	GLenum binaryFormat;
+	//
+	//  Retrieve the binary from the program object
+	//
+	glGetProgramiv(hShader, GL_PROGRAM_BINARY_LENGTH, &binaryLength);
+	binary = (void*)malloc(binaryLength);
+	glGetProgramBinary(hShader, binaryLength, NULL, &binaryFormat, binary);
+
+	//
+	//  Cache the program binary for future runs
+	//
+	outfile = fopen(name, "wb");
+	fwrite(binary, binaryLength, 1, outfile);
+	fclose(outfile);
+	free(binary);
+
+
 	glUseProgram(0);
 	return !!linked;
 }
@@ -316,8 +337,8 @@ static const FEffectShader effectshaders[]=
 {
 	{ "fogboundary", "shaders/glsl/main.vp", "shaders/glsl/fogboundary.fp", NULL, "" },
 	{ "spheremap", "shaders/glsl/main.vp", "shaders/glsl/main.fp", "shaders/glsl/func_normal.fp", "#define SPHEREMAP\n" },
-	{ "burn", "shaders/glsl/burn.vp", "shaders/glsl/burn.fp", NULL, "" },
-	{ "stencil", "shaders/glsl/stencil.vp", "shaders/glsl/stencil.fp", NULL, "" },
+	{ "burn", "shaders/glsl/main.vp", "shaders/glsl/burn.fp", NULL, "#define SIMPLE\n" },
+	{ "stencil", "shaders/glsl/main.vp", "shaders/glsl/stencil.fp", NULL, "#define SIMPLE\n" },
 };
 
 
diff --git a/wadsrc/static/shaders/glsl/burn.vp b/wadsrc/static/shaders/glsl/burn.vp
deleted file mode 100644
index 6a8d2b37b..000000000
--- a/wadsrc/static/shaders/glsl/burn.vp
+++ /dev/null
@@ -1,7 +0,0 @@
-
-void main()
-{
-	gl_FrontColor = gl_Color;
-	gl_TexCoord[0] = gl_MultiTexCoord0;
-	gl_Position = ProjectionMatrix * gl_Vertex;
-}
diff --git a/wadsrc/static/shaders/glsl/main.vp b/wadsrc/static/shaders/glsl/main.vp
index 81b0601c5..f0bbdd413 100644
--- a/wadsrc/static/shaders/glsl/main.vp
+++ b/wadsrc/static/shaders/glsl/main.vp
@@ -1,7 +1,9 @@
 
+#ifndef SIMPLE	// we do not need these for simple shaders
 in vec4 aVertex2;
 out vec4 pixelpos;
 out vec2 glowdist;
+#endif
 
 #ifdef UNIFORM_VB
 uniform float fakeVB[100];
@@ -30,16 +32,23 @@ void main()
 	#define tc gl_MultiTexCoord0
 #endif
 	
-	vec4 worldcoord = ModelMatrix * mix(vert, aVertex2, uInterpolationFactor);
+	#ifndef SIMPLE
+		vec4 worldcoord = ModelMatrix * mix(vert, aVertex2, uInterpolationFactor);
+	#else
+		vec4 worldcoord = ModelMatrix * vert;
+	#endif
+
 	vec4 eyeCoordPos = ViewMatrix * worldcoord;
 
 	gl_FrontColor = gl_Color;
-	
-	pixelpos.xyz = worldcoord.xyz;
-	pixelpos.w = -eyeCoordPos.z/eyeCoordPos.w;
 
-	glowdist.x = -((uGlowTopPlane.w + uGlowTopPlane.x * worldcoord.x + uGlowTopPlane.y * worldcoord.z) * uGlowTopPlane.z) - worldcoord.y;
-	glowdist.y = worldcoord.y + ((uGlowBottomPlane.w + uGlowBottomPlane.x * worldcoord.x + uGlowBottomPlane.y * worldcoord.z) * uGlowBottomPlane.z);
+	#ifndef SIMPLE
+		pixelpos.xyz = worldcoord.xyz;
+		pixelpos.w = -eyeCoordPos.z/eyeCoordPos.w;
+
+		glowdist.x = -((uGlowTopPlane.w + uGlowTopPlane.x * worldcoord.x + uGlowTopPlane.y * worldcoord.z) * uGlowTopPlane.z) - worldcoord.y;
+		glowdist.y = worldcoord.y + ((uGlowBottomPlane.w + uGlowBottomPlane.x * worldcoord.x + uGlowBottomPlane.y * worldcoord.z) * uGlowBottomPlane.z);
+	#endif
 	
 	#ifdef SPHEREMAP
 		vec3 u = normalize(eyeCoordPos.xyz);
diff --git a/wadsrc/static/shaders/glsl/stencil.vp b/wadsrc/static/shaders/glsl/stencil.vp
deleted file mode 100644
index f5ac9fdd1..000000000
--- a/wadsrc/static/shaders/glsl/stencil.vp
+++ /dev/null
@@ -1,14 +0,0 @@
-
-out vec4 pixelpos;
-
-void main()
-{
-	// perform exactly the same relevant steps as in the main shader to ensure matching results (that also means including the model matrix here!)
-	vec4 worldcoord = ModelMatrix * gl_Vertex;
-	vec4 eyeCoordPos = ViewMatrix * worldcoord;
-
-	pixelpos.xyz = worldcoord.xyz;
-	pixelpos.w = -eyeCoordPos.z/eyeCoordPos.w;
-	
-	gl_Position = ProjectionMatrix * eyeCoordPos;
-}