- redid postprocessing shader interface to be free of the player dependency.

This is something that really should be done in higher level code - the shader interface should only concern itself with the shader and not the conditions that block its use.
The Shader class has been redone as a thin wrapper and been deprecated.

src/common/rendering/hwrenderer/postprocessing/hw_postprocessshader.cpp

@@ -0,0 +1,139 @@
+/*
+**  Postprocessing framework
+**  Copyright (c) 2016-2020 Magnus Norddahl
+**
+**  This software is provided 'as-is', without any express or implied
+**  warranty.  In no event will the authors be held liable for any damages
+**  arising from the use of this software.
+**
+**  Permission is granted to anyone to use this software for any purpose,
+**  including commercial applications, and to alter it and redistribute it
+**  freely, subject to the following restrictions:
+**
+**  1. The origin of this software must not be misrepresented; you must not
+**     claim that you wrote the original software. If you use this software
+**     in a product, an acknowledgment in the product documentation would be
+**     appreciated but is not required.
+**  2. Altered source versions must be plainly marked as such, and must not be
+**     misrepresented as being the original software.
+**  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "vm.h"
+#include "hwrenderer/postprocessing/hw_postprocessshader.h"
+#include "hwrenderer/postprocessing/hw_postprocess.h"
+
+static void ShaderSetEnabled(const FString &shaderName, bool value)
+{
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+			shader.Enabled = value;
+	}
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(_PPShader, SetEnabled, ShaderSetEnabled)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_BOOL(value);
+	ShaderSetEnabled(shaderName, value);
+
+	return 0;
+}
+
+static void ShaderSetUniform1f(const FString &shaderName, const FString &uniformName, double value)
+{
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = value;
+			vec4[1] = 0.0;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+}
+
+DEFINE_ACTION_FUNCTION_NATIVE(_PPShader, SetUniform1f, ShaderSetUniform1f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(value);
+	ShaderSetUniform1f(shaderName, uniformName, value);
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform2f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = x;
+			vec4[1] = y;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform3f)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_FLOAT(x);
+	PARAM_FLOAT(y);
+	PARAM_FLOAT(z);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = x;
+			vec4[1] = y;
+			vec4[2] = z;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(_PPShader, SetUniform1i)
+{
+	PARAM_PROLOGUE;
+	PARAM_STRING(shaderName);
+	PARAM_STRING(uniformName);
+	PARAM_INT(value);
+
+	for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
+	{
+		PostProcessShader &shader = PostProcessShaders[i];
+		if (shader.Name == shaderName)
+		{
+			double *vec4 = shader.Uniforms[uniformName].Values;
+			vec4[0] = (double)value;
+			vec4[1] = 0.0;
+			vec4[2] = 0.0;
+			vec4[3] = 1.0;
+		}
+	}
+	return 0;
+}