/*
**  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 "d_player.h"
#include "hwrenderer/postprocessing/hw_postprocessshader.h"
#include "g_levellocals.h"

void PPShadowMap::Update(PPRenderState *renderstate)
{
	ShadowMapUniforms uniforms;
	uniforms.ShadowmapQuality = (float)gl_shadowmap_quality;
	uniforms.NodesCount = screen->mShadowMap.NodesCount();

	renderstate->PushGroup("shadowmap");

	renderstate->Clear();
	renderstate->Shader = &ShadowMap;
	renderstate->Uniforms.Set(uniforms);
	renderstate->Viewport = { 0, 0, gl_shadowmap_quality, 1024 };
	renderstate->SetShadowMapBuffers(true);
	renderstate->SetOutputShadowMap();
	renderstate->SetNoBlend();
	renderstate->Draw();

	renderstate->PopGroup();
}


static bool IsConsolePlayer(player_t *player)
{
	AActor *activator = player ? player->mo : nullptr;
	if (activator == nullptr || activator->player == nullptr)
		return false;
	return activator->player == activator->Level->GetConsolePlayer();
}

static void ShaderSetEnabled(player_t *player, const FString &shaderName, bool value)
{
	if (IsConsolePlayer(player))
	{
		for (unsigned int i = 0; i < PostProcessShaders.Size(); i++)
		{
			PostProcessShader &shader = PostProcessShaders[i];
			if (shader.Name == shaderName)
				shader.Enabled = value;
		}
	}
}

DEFINE_ACTION_FUNCTION_NATIVE(_Shader, SetEnabled, ShaderSetEnabled)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(player, player_t);
	PARAM_STRING(shaderName);
	PARAM_BOOL(value);
	ShaderSetEnabled(player, shaderName, value);

	return 0;
}

static void ShaderSetUniform1f(player_t *player, const FString &shaderName, const FString &uniformName, double value)
{
	if (IsConsolePlayer(player))
	{
		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(_Shader, SetUniform1f, ShaderSetUniform1f)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(player, player_t);
	PARAM_STRING(shaderName);
	PARAM_STRING(uniformName);
	PARAM_FLOAT(value);
	ShaderSetUniform1f(player, shaderName, uniformName, value);
	return 0;
}

DEFINE_ACTION_FUNCTION(_Shader, SetUniform2f)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(player, player_t);
	PARAM_STRING(shaderName);
	PARAM_STRING(uniformName);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);

	if (IsConsolePlayer(player))
	{
		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(_Shader, SetUniform3f)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(player, player_t);
	PARAM_STRING(shaderName);
	PARAM_STRING(uniformName);
	PARAM_FLOAT(x);
	PARAM_FLOAT(y);
	PARAM_FLOAT(z);

	if (IsConsolePlayer(player))
	{
		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(_Shader, SetUniform1i)
{
	PARAM_PROLOGUE;
	PARAM_POINTER(player, player_t);
	PARAM_STRING(shaderName);
	PARAM_STRING(uniformName);
	PARAM_INT(value);

	if (IsConsolePlayer(player))
	{
		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;
}