qzdoom/src/gl/renderer/gl_renderer.cpp

/*
** gl1_renderer.cpp
** Renderer interface
**
**---------------------------------------------------------------------------
** Copyright 2008 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 "files.h"
#include "m_swap.h"
#include "v_video.h"
#include "r_data/r_translate.h"
#include "m_png.h"
#include "m_crc32.h"
#include "w_wad.h"
//#include "gl/gl_intern.h"
#include "gl/gl_functions.h"
#include "vectors.h"
#include "doomstat.h"

#include "gl/system/gl_interface.h"
#include "gl/system/gl_framebuffer.h"
#include "gl/system/gl_cvars.h"
#include "gl/renderer/gl_renderer.h"
#include "gl/renderer/gl_lightdata.h"
#include "gl/renderer/gl_renderstate.h"
#include "gl/renderer/gl_renderbuffers.h"
#include "gl/renderer/gl_2ddrawer.h"
#include "gl/data/gl_data.h"
#include "gl/data/gl_vertexbuffer.h"
#include "gl/scene/gl_drawinfo.h"
#include "gl/shaders/gl_shader.h"
#include "gl/shaders/gl_bloomshader.h"
#include "gl/shaders/gl_blurshader.h"
#include "gl/shaders/gl_tonemapshader.h"
#include "gl/shaders/gl_lensshader.h"
#include "gl/shaders/gl_presentshader.h"
#include "gl/textures/gl_texture.h"
#include "gl/textures/gl_translate.h"
#include "gl/textures/gl_material.h"
#include "gl/textures/gl_samplers.h"
#include "gl/utility/gl_clock.h"
#include "gl/utility/gl_templates.h"
#include "gl/models/gl_models.h"
#include "gl/dynlights/gl_lightbuffer.h"

EXTERN_CVAR(Int, screenblocks)

//===========================================================================
// 
// Renderer interface
//
//===========================================================================

//-----------------------------------------------------------------------------
//
// Initialize
//
//-----------------------------------------------------------------------------

FGLRenderer::FGLRenderer(OpenGLFrameBuffer *fb) 
{
	framebuffer = fb;
	mClipPortal = NULL;
	mCurrentPortal = NULL;
	mMirrorCount = 0;
	mPlaneMirrorCount = 0;
	mLightCount = 0;
	mAngles = FRotator(0.f, 0.f, 0.f);
	mViewVector = FVector2(0,0);
	mVBO = NULL;
	mSkyVBO = NULL;
	gl_spriteindex = 0;
	mShaderManager = NULL;
	gllight = glpart2 = glpart = mirrortexture = NULL;
	mLights = NULL;
	m2DDrawer = nullptr;
}

void gl_LoadModels();
void gl_FlushModels();

void FGLRenderer::Initialize()
{
	mBuffers = new FGLRenderBuffers();
	mBloomExtractShader = new FBloomExtractShader();
	mBloomCombineShader = new FBloomCombineShader();
	mBlurShader = new FBlurShader();
	mTonemapShader = new FTonemapShader();
	mLensShader = new FLensShader();
	mPresentShader = new FPresentShader();
	m2DDrawer = new F2DDrawer;

	// Only needed for the core profile, because someone decided it was a good idea to remove the default VAO.
	if (gl.version >= 4.0)
	{
		glGenVertexArrays(1, &mVAOID);
		glBindVertexArray(mVAOID);
	}
	else mVAOID = 0;

	gllight = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/gllight.png"), FTexture::TEX_MiscPatch);
	glpart2 = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/glpart2.png"), FTexture::TEX_MiscPatch);
	glpart = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/glpart.png"), FTexture::TEX_MiscPatch);
	mirrortexture = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/mirror.png"), FTexture::TEX_MiscPatch);

	mVBO = new FFlatVertexBuffer;
	mSkyVBO = new FSkyVertexBuffer;
	if (gl.lightmethod != LM_SOFTWARE) mLights = new FLightBuffer();
	else mLights = NULL;
	gl_RenderState.SetVertexBuffer(mVBO);
	mFBID = 0;
	mOldFBID = 0;

	SetupLevel();
	mShaderManager = new FShaderManager;
	mSamplerManager = new FSamplerManager;
	gl_LoadModels();
}

FGLRenderer::~FGLRenderer() 
{
	gl_FlushModels();
	gl_DeleteAllAttachedLights();
	FMaterial::FlushAll();
	if (m2DDrawer != nullptr) delete m2DDrawer;
	if (mShaderManager != NULL) delete mShaderManager;
	if (mSamplerManager != NULL) delete mSamplerManager;
	if (mVBO != NULL) delete mVBO;
	if (mSkyVBO != NULL) delete mSkyVBO;
	if (mLights != NULL) delete mLights;
	if (glpart2) delete glpart2;
	if (glpart) delete glpart;
	if (mirrortexture) delete mirrortexture;
	if (mFBID != 0) glDeleteFramebuffers(1, &mFBID);
	if (mVAOID != 0)
	{
		glBindVertexArray(0);
		glDeleteVertexArrays(1, &mVAOID);
	}
	if (mBuffers) delete mBuffers;
	if (mPresentShader) delete mPresentShader;
	if (mBloomExtractShader) delete mBloomExtractShader;
	if (mBloomCombineShader) delete mBloomCombineShader;
	if (mBlurShader) delete mBlurShader;
	if (mTonemapShader) delete mTonemapShader;
	if (mLensShader) delete mLensShader;
}

//==========================================================================
//
// Calculates the viewport values needed for 2D and 3D operations
//
//==========================================================================

void FGLRenderer::SetOutputViewport(GL_IRECT *bounds)
{
	if (bounds)
	{
		mOutputViewport = *bounds;
		mOutputViewportLB = *bounds;
		mScreenViewport = *bounds;
		return;
	}

	int height, width;

	// Special handling so the view with a visible status bar displays properly

	if (screenblocks >= 10)
	{
		height = framebuffer->GetHeight();
		width = framebuffer->GetWidth();
	}
	else
	{
		height = (screenblocks*framebuffer->GetHeight() / 10) & ~7;
		width = (screenblocks*framebuffer->GetWidth() / 10);
	}

	int trueheight = framebuffer->GetTrueHeight();	// ugh...
	int bars = (trueheight - framebuffer->GetHeight()) / 2;

	int vw = viewwidth;
	int vh = viewheight;

	// The entire renderable area, including the 2D HUD
	mScreenViewport.left = 0;
	mScreenViewport.top = 0;
	mScreenViewport.width = framebuffer->GetWidth();
	mScreenViewport.height = framebuffer->GetHeight();

	// Letterboxed viewport for the main scene
	mOutputViewportLB.left = viewwindowx;
	mOutputViewportLB.top = trueheight - bars - (height + viewwindowy - ((height - vh) / 2));
	mOutputViewportLB.width = vw;
	mOutputViewportLB.height = height;

	// Entire canvas for player sprites
	mOutputViewport.left = 0;
	mOutputViewport.top = (trueheight - framebuffer->GetHeight()) / 2;
	mOutputViewport.width = framebuffer->GetWidth();
	mOutputViewport.height = framebuffer->GetHeight();
}

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

void FGLRenderer::SetupLevel()
{
	mVBO->CreateVBO();
}

void FGLRenderer::Begin2D()
{
	if (FGLRenderBuffers::IsEnabled())
	{
		mBuffers->Setup(framebuffer->GetWidth(), framebuffer->GetHeight());
		if (mDrawingScene2D)
			mBuffers->BindSceneFB();
		else
			mBuffers->BindCurrentFB();
	}
	glViewport(mScreenViewport.left, mScreenViewport.top, mScreenViewport.width, mScreenViewport.height);

	gl_RenderState.EnableFog(false);
	gl_RenderState.Set2DMode(true);
}

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

void FGLRenderer::ProcessLowerMiniseg(seg_t *seg, sector_t * frontsector, sector_t * backsector)
{
	GLWall wall;
	wall.ProcessLowerMiniseg(seg, frontsector, backsector);
	rendered_lines++;
}

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

void FGLRenderer::ProcessSprite(AActor *thing, sector_t *sector, bool thruportal)
{
	GLSprite glsprite;
	glsprite.Process(thing, sector, thruportal);
}

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

void FGLRenderer::ProcessParticle(particle_t *part, sector_t *sector)
{
	GLSprite glsprite;
	glsprite.ProcessParticle(part, sector);//, 0, 0);
}

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

void FGLRenderer::ProcessSector(sector_t *fakesector)
{
	GLFlat glflat;
	glflat.ProcessSector(fakesector);
}

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

void FGLRenderer::FlushTextures()
{
	FMaterial::FlushAll();
}

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

bool FGLRenderer::StartOffscreen()
{
	if (mFBID == 0) glGenFramebuffers(1, &mFBID);
	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &mOldFBID);
	glBindFramebuffer(GL_FRAMEBUFFER, mFBID);
	return true;
}

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

void FGLRenderer::EndOffscreen()
{
	glBindFramebuffer(GL_FRAMEBUFFER, mOldFBID); 
}

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

unsigned char *FGLRenderer::GetTextureBuffer(FTexture *tex, int &w, int &h)
{
	FMaterial * gltex = FMaterial::ValidateTexture(tex, false);
	if (gltex)
	{
		return gltex->CreateTexBuffer(0, w, h);
	}
	return NULL;
}

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

void FGLRenderer::ClearBorders()
{
	OpenGLFrameBuffer *glscreen = static_cast<OpenGLFrameBuffer*>(screen);

	// Letterbox time! Draw black top and bottom borders.
	int width = glscreen->GetWidth();
	int height = glscreen->GetHeight();
	int trueHeight = glscreen->GetTrueHeight();

	int borderHeight = (trueHeight - height) / 2;

	glViewport(0, 0, width, trueHeight);
	glClearColor(0, 0, 0, 1);
	glEnable(GL_SCISSOR_TEST);
	glScissor(0, 0, width, borderHeight);
	glClear(GL_COLOR_BUFFER_BIT);
	glScissor(0, trueHeight-borderHeight, width, borderHeight);
	glClear(GL_COLOR_BUFFER_BIT);
	glDisable(GL_SCISSOR_TEST);
	glViewport(0, (trueHeight - height) / 2, width, height); 
}