gzdoom/src/gl/shaders/gl_shader.cpp

/*
** gl_shader.cpp
**
** GLSL shader handling
**
**---------------------------------------------------------------------------
** Copyright 2004-2009 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
**    notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
**    notice, this list of conditions and the following disclaimer in the
**    documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
**    derived from this software without specific prior written permission.
** 4. When not used as part of GZDoom or a GZDoom derivative, this code will be
**    covered by the terms of the GNU Lesser General Public License as published
**    by the Free Software Foundation; either version 2.1 of the License, or (at
**    your option) any later version.
** 5. Full disclosure of the entire project's source code, except for third
**    party libraries is mandatory. (NOTE: This clause is non-negotiable!)
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include "gl/system/gl_system.h"
#include "c_cvars.h"
#include "v_video.h"
#include "name.h"
#include "w_wad.h"
#include "i_system.h"
#include "doomerrors.h"
#include "v_palette.h"
#include "sc_man.h"
#include "cmdlib.h"

#include "gl/system/gl_interface.h"
#include "gl/data/gl_data.h"
#include "gl/renderer/gl_renderer.h"
#include "gl/renderer/gl_renderstate.h"
#include "gl/system/gl_cvars.h"
#include "gl/shaders/gl_shader.h"
#include "gl/textures/gl_material.h"

//==========================================================================
//
//
//
//==========================================================================

bool FShader::Load(const char * name, const char * vert_prog_lump, const char * frag_prog_lump, const char * proc_prog_lump, const char * defines)
{
	static char buffer[10000];
	FString error;

	int i_lump = Wads.CheckNumForFullName("shaders/glsl/shaderdefs.i");
	if (i_lump == -1) I_Error("Unable to load 'shaders/glsl/shaderdefs.i'");
	FMemLump i_data = Wads.ReadLump(i_lump);

	int vp_lump = Wads.CheckNumForFullName(vert_prog_lump);
	if (vp_lump == -1) I_Error("Unable to load '%s'", vert_prog_lump);
	FMemLump vp_data = Wads.ReadLump(vp_lump);

	int fp_lump = Wads.CheckNumForFullName(frag_prog_lump);
	if (fp_lump == -1) I_Error("Unable to load '%s'", frag_prog_lump);
	FMemLump fp_data = Wads.ReadLump(fp_lump);



//
// The following code uses GetChars on the strings to get rid of terminating 0 characters. Do not remove or the code may break!
//

	FString vp_comb = "#version 130\n";
	if (gl.glslversion >= 3.3f) vp_comb = "#version 330 compatibility\n";	// I can't shut up the deprecation warnings in GLSL 1.3 so if available use a version with compatibility profile.
	// todo when using shader storage buffers, add
	// "#version 400 compatibility\n#extension GL_ARB_shader_storage_buffer_object : require\n" instead.

	if (!(gl.flags & RFL_BUFFER_STORAGE))
	{
		// we only want the uniform array hack in the shader if we actually need it.
		vp_comb << "#define UNIFORM_VB\n";
	}

	vp_comb << defines << i_data.GetString().GetChars();
	FString fp_comb = vp_comb;

	vp_comb << vp_data.GetString().GetChars() << "\n";
	fp_comb << fp_data.GetString().GetChars() << "\n";

	if (proc_prog_lump != NULL)
	{
		if (*proc_prog_lump != '#')
		{
			int pp_lump = Wads.CheckNumForFullName(proc_prog_lump);
			if (pp_lump == -1) I_Error("Unable to load '%s'", proc_prog_lump);
			FMemLump pp_data = Wads.ReadLump(pp_lump);

			if (pp_data.GetString().IndexOf("ProcessTexel") < 0)
			{
				// this looks like an old custom hardware shader.
				// We need to replace the ProcessTexel call to make it work.

				fp_comb.Substitute("vec4 frag = ProcessTexel();", "vec4 frag = Process(vec4(1.0));");
			}
			fp_comb << pp_data.GetString().GetChars();

			if (pp_data.GetString().IndexOf("ProcessLight") < 0)
			{
				int pl_lump = Wads.CheckNumForFullName("shaders/glsl/func_defaultlight.fp");
				if (pl_lump == -1) I_Error("Unable to load '%s'", "shaders/glsl/func_defaultlight.fp");
				FMemLump pl_data = Wads.ReadLump(pl_lump);
				fp_comb << "\n" << pl_data.GetString().GetChars();
			}
		}
		else
		{
			// Proc_prog_lump is not a lump name but the source itself (from generated shaders)
			fp_comb << proc_prog_lump + 1;
		}
	}

	hVertProg = glCreateShader(GL_VERTEX_SHADER);
	hFragProg = glCreateShader(GL_FRAGMENT_SHADER);	


	int vp_size = (int)vp_comb.Len();
	int fp_size = (int)fp_comb.Len();

	const char *vp_ptr = vp_comb.GetChars();
	const char *fp_ptr = fp_comb.GetChars();

	glShaderSource(hVertProg, 1, &vp_ptr, &vp_size);
	glShaderSource(hFragProg, 1, &fp_ptr, &fp_size);

	glCompileShader(hVertProg);
	glCompileShader(hFragProg);

	hShader = glCreateProgram();

	glAttachShader(hShader, hVertProg);
	glAttachShader(hShader, hFragProg);

	glLinkProgram(hShader);

	glGetShaderInfoLog(hVertProg, 10000, NULL, buffer);
	if (*buffer) 
	{
		error << "Vertex shader:\n" << buffer << "\n";
	}
	glGetShaderInfoLog(hFragProg, 10000, NULL, buffer);
	if (*buffer) 
	{
		error << "Fragment shader:\n" << buffer << "\n";
	}

	glGetProgramInfoLog(hShader, 10000, NULL, buffer);
	if (*buffer) 
	{
		error << "Linking:\n" << buffer << "\n";
	}
	int linked;
	glGetProgramiv(hShader, GL_LINK_STATUS, &linked);
	if (linked == 0)
	{
		// only print message if there's an error.
		I_Error("Init Shader '%s':\n%s\n", name, error.GetChars());
	}


	muDesaturation.Init(hShader, "uDesaturationFactor");
	muFogEnabled.Init(hShader, "uFogEnabled");
	muTextureMode.Init(hShader, "uTextureMode");
	muCameraPos.Init(hShader, "uCameraPos");
	muLightParms.Init(hShader, "uLightAttr");
	muColormapStart.Init(hShader, "uFixedColormapStart");
	muColormapRange.Init(hShader, "uFixedColormapRange");
	muLightRange.Init(hShader, "uLightRange");
	muFogColor.Init(hShader, "uFogColor");
	muDynLightColor.Init(hShader, "uDynLightColor");
	muObjectColor.Init(hShader, "uObjectColor");
	muGlowBottomColor.Init(hShader, "uGlowBottomColor");
	muGlowTopColor.Init(hShader, "uGlowTopColor");
	muGlowBottomPlane.Init(hShader, "uGlowBottomPlane");
	muGlowTopPlane.Init(hShader, "uGlowTopPlane");
	muFixedColormap.Init(hShader, "uFixedColormap");
	muInterpolationFactor.Init(hShader, "uInterpolationFactor");

	timer_index = glGetUniformLocation(hShader, "timer");
	lights_index = glGetUniformLocation(hShader, "lights");
	fakevb_index = glGetUniformLocation(hShader, "fakeVB");

	glBindAttribLocation(hShader, VATTR_VERTEX2, "aVertex2");

	glUseProgram(hShader);

	int texture_index = glGetUniformLocation(hShader, "texture2");
	if (texture_index > 0) glUniform1i(texture_index, 1);

	glUseProgram(0);
	return !!linked;
}

//==========================================================================
//
//
//
//==========================================================================

FShader::~FShader()
{
	glDeleteProgram(hShader);
	glDeleteShader(hVertProg);
	glDeleteShader(hFragProg);
}


//==========================================================================
//
//
//
//==========================================================================

bool FShader::Bind()
{
	GLRenderer->mShaderManager->SetActiveShader(this);
	return true;
}

//==========================================================================
//
// Since all shaders are REQUIRED, any error here needs to be fatal
//
//==========================================================================

FShader *FShaderManager::Compile (const char *ShaderName, const char *ShaderPath)
{
	// this can't be in the shader code due to ATI strangeness.
	const char *str = (gl.MaxLights() == 128)? "#define MAXLIGHTS128\n" : "";

	FShader *shader = NULL;
	try
	{
		shader = new FShader(ShaderName);
		if (!shader->Load(ShaderName, "shaders/glsl/main.vp", "shaders/glsl/main.fp", ShaderPath, str))
		{
			I_FatalError("Unable to load shader %s\n", ShaderName);
		}
	}
	catch(CRecoverableError &err)
	{
		if (shader != NULL) delete shader;
		shader = NULL;
		I_FatalError("Unable to load shader %s:\n%s\n", ShaderName, err.GetMessage());
	}
	return shader;
}

//==========================================================================
//
//
//
//==========================================================================
struct FDefaultShader 
{
	const char * ShaderName;
	const char * gettexelfunc;
};

// Note: the FIRST_USER_SHADER constant in gl_shader.h needs 
// to be updated whenever the size of this array is modified.
static const FDefaultShader defaultshaders[]=
{	
	{"Default",	"shaders/glsl/func_normal.fp"},
	{"Warp 1",	"shaders/glsl/func_warp1.fp"},
	{"Warp 2",	"shaders/glsl/func_warp2.fp"},
	{"Brightmap","shaders/glsl/func_brightmap.fp"},
	{"No Texture", "shaders/glsl/func_notexture.fp"},
	{"Basic Fuzz", "shaders/glsl/fuzz_standard.fp"},
	{"Smooth Fuzz", "shaders/glsl/fuzz_smooth.fp"},
	{"Swirly Fuzz", "shaders/glsl/fuzz_swirly.fp"},
	{"Translucent Fuzz", "shaders/glsl/fuzz_smoothtranslucent.fp"},
	{"Jagged Fuzz", "shaders/glsl/fuzz_jagged.fp"},
	{"Noise Fuzz", "shaders/glsl/fuzz_noise.fp"},
	{"Smooth Noise Fuzz", "shaders/glsl/fuzz_smoothnoise.fp"},
	{NULL,NULL}
};

static TArray<FString> usershaders;

struct FEffectShader
{
	const char *ShaderName;
	const char *vp;
	const char *fp1;
	const char *fp2;
	const char *defines;
};

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, "" },
};


//==========================================================================
//
//
//
//==========================================================================

FShaderManager::FShaderManager()
{
	CompileShaders();
}

//==========================================================================
//
//
//
//==========================================================================

FShaderManager::~FShaderManager()
{
	Clean();
}

//==========================================================================
//
//
//
//==========================================================================

void FShaderManager::CompileShaders()
{
	mActiveShader = mEffectShaders[0] = mEffectShaders[1] = NULL;

	for(int i=0;defaultshaders[i].ShaderName != NULL;i++)
	{
		FShader *shc = Compile(defaultshaders[i].ShaderName, defaultshaders[i].gettexelfunc);
		mTextureEffects.Push(shc);
	}

	for(unsigned i = 0; i < usershaders.Size(); i++)
	{
		FString name = ExtractFileBase(usershaders[i]);
		FName sfn = name;

		FShader *shc = Compile(sfn, usershaders[i]);
		mTextureEffects.Push(shc);
	}

	for(int i=0;i<MAX_EFFECTS;i++)
	{
		FShader *eff = new FShader(effectshaders[i].ShaderName);
		if (!eff->Load(effectshaders[i].ShaderName, effectshaders[i].vp, effectshaders[i].fp1,
						effectshaders[i].fp2, effectshaders[i].defines))
		{
			delete eff;
		}
		else mEffectShaders[i] = eff;
	}
}

//==========================================================================
//
//
//
//==========================================================================

void FShaderManager::Clean()
{
	glUseProgram(0);
	mActiveShader = NULL;

	for (unsigned int i = 0; i < mTextureEffects.Size(); i++)
	{
		if (mTextureEffects[i] != NULL) delete mTextureEffects[i];
	}
	for (int i = 0; i < MAX_EFFECTS; i++)
	{
		if (mEffectShaders[i] != NULL) delete mEffectShaders[i];
		mEffectShaders[i] = NULL;
	}
	mTextureEffects.Clear();
}

//==========================================================================
//
//
//
//==========================================================================

int FShaderManager::Find(const char * shn)
{
	FName sfn = shn;

	for(unsigned int i=0;i<mTextureEffects.Size();i++)
	{
		if (mTextureEffects[i]->mName == sfn)
		{
			return i;
		}
	}
	return -1;
}

//==========================================================================
//
//
//
//==========================================================================

void FShaderManager::SetActiveShader(FShader *sh)
{
	if (mActiveShader != sh)
	{
		glUseProgram(sh!= NULL? sh->GetHandle() : 0);
		mActiveShader = sh;
	}
}


//==========================================================================
//
// To avoid maintenance this will be set when a warped texture is bound
// because at that point the draw buffer needs to be flushed anyway.
//
//==========================================================================

void FShaderManager::SetWarpSpeed(unsigned int eff, float speed)
{
	// indices 0-2 match the warping modes, 3 is brightmap, 4 no texture, the following are custom
	if (eff < mTextureEffects.Size())
	{
		FShader *sh = mTextureEffects[eff];

		float warpphase = gl_frameMS * speed / 1000.f;
		glProgramUniform1f(sh->GetHandle(), sh->timer_index, warpphase);
	}
}

//==========================================================================
//
//
//
//==========================================================================

FShader *FShaderManager::BindEffect(int effect)
{
	if (effect >= 0 && effect < MAX_EFFECTS && mEffectShaders[effect] != NULL)
	{
		mEffectShaders[effect]->Bind();
		return mEffectShaders[effect];
	}
	return NULL;
}


//==========================================================================
//
//
//
//==========================================================================

void gl_DestroyUserShaders()
{
	// todo
}

//==========================================================================
//
// Parses a shader definition
//
//==========================================================================

void gl_ParseHardwareShader(FScanner &sc, int deflump)
{
	int type = FTexture::TEX_Any;
	bool disable_fullbright=false;
	bool thiswad = false;
	bool iwad = false;
	int maplump = -1;
	FString maplumpname;
	float speed = 1.f;

	sc.MustGetString();
	if (sc.Compare("texture")) type = FTexture::TEX_Wall;
	else if (sc.Compare("flat")) type = FTexture::TEX_Flat;
	else if (sc.Compare("sprite")) type = FTexture::TEX_Sprite;
	else sc.UnGet();

	sc.MustGetString();
	FTextureID no = TexMan.CheckForTexture(sc.String, type);
	FTexture *tex = TexMan[no];

	sc.MustGetToken('{');
	while (!sc.CheckToken('}'))
	{
		sc.MustGetString();
		if (sc.Compare("shader"))
		{
			sc.MustGetString();
			maplumpname = sc.String;
		}
		else if (sc.Compare("speed"))
		{
			sc.MustGetFloat();
			speed = float(sc.Float);
		}
	}
	if (!tex)
	{
		return;
	}

	if (maplumpname.IsNotEmpty())
	{
		if (tex->bWarped != 0)
		{
			Printf("Cannot combine warping with hardware shader on texture '%s'\n", tex->Name.GetChars());
			return;
		}
		tex->gl_info.shaderspeed = speed; 
		for(unsigned i=0;i<usershaders.Size();i++)
		{
			if (!usershaders[i].CompareNoCase(maplumpname))
			{
				tex->gl_info.shaderindex = i + FIRST_USER_SHADER;
				return;
			}
		}
		tex->gl_info.shaderindex = usershaders.Push(maplumpname) + FIRST_USER_SHADER;
	}	
}