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gl_framebuffer.cpp
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gl_framebuffer.cpp
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//
//---------------------------------------------------------------------------
//
// Copyright(C) 2010-2016 Christoph Oelckers
// All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see http://www.gnu.org/licenses/
//
//--------------------------------------------------------------------------
//
/*
** gl_framebuffer.cpp
** Implementation of the non-hardware specific parts of the
** OpenGL frame buffer
**
*/
#include "gl_load/gl_system.h"
#include "v_video.h"
#include "m_png.h"
#include "templates.h"
#include "gl_load/gl_interface.h"
#include "gl/system/gl_framebuffer.h"
#include "gl/renderer/gl_renderer.h"
#include "gl/renderer/gl_renderbuffers.h"
#include "gl/textures/gl_samplers.h"
#include "hwrenderer/utility/hw_clock.h"
#include "hwrenderer/utility/hw_vrmodes.h"
#include "hwrenderer/models/hw_models.h"
#include "hwrenderer/scene/hw_skydome.h"
#include "hwrenderer/data/hw_viewpointbuffer.h"
#include "hwrenderer/dynlights/hw_lightbuffer.h"
#include "gl/shaders/gl_shaderprogram.h"
#include "gl_debug.h"
#include "r_videoscale.h"
#include "gl_buffers.h"
#include "hwrenderer/data/flatvertices.h"
EXTERN_CVAR (Bool, vid_vsync)
EXTERN_CVAR(Bool, r_drawvoxels)
EXTERN_CVAR(Int, gl_tonemap)
EXTERN_CVAR(Bool, gl_texture_usehires)
void gl_LoadExtensions();
void gl_PrintStartupLog();
void Draw2D(F2DDrawer *drawer, FRenderState &state);
extern bool vid_hdr_active;
namespace OpenGLRenderer
{
FGLRenderer *GLRenderer;
//==========================================================================
//
//
//
//==========================================================================
OpenGLFrameBuffer::OpenGLFrameBuffer(void *hMonitor, bool fullscreen) :
Super(hMonitor, fullscreen)
{
// SetVSync needs to be at the very top to workaround a bug in Nvidia's OpenGL driver.
// If wglSwapIntervalEXT is called after glBindFramebuffer in a frame the setting is not changed!
Super::SetVSync(vid_vsync);
// Make sure all global variables tracking OpenGL context state are reset..
FHardwareTexture::InitGlobalState();
gl_RenderState.Reset();
GLRenderer = nullptr;
}
OpenGLFrameBuffer::~OpenGLFrameBuffer()
{
PPResource::ResetAll();
if (mVertexData != nullptr) delete mVertexData;
if (mSkyData != nullptr) delete mSkyData;
if (mViewpoints != nullptr) delete mViewpoints;
if (mLights != nullptr) delete mLights;
mShadowMap.Reset();
if (GLRenderer)
{
delete GLRenderer;
GLRenderer = nullptr;
}
}
//==========================================================================
//
// Initializes the GL renderer
//
//==========================================================================
void OpenGLFrameBuffer::InitializeState()
{
static bool first=true;
if (first)
{
if (ogl_LoadFunctions() == ogl_LOAD_FAILED)
{
I_FatalError("Failed to load OpenGL functions.");
}
}
gl_LoadExtensions();
// Move some state to the framebuffer object for easier access.
hwcaps = gl.flags;
glslversion = gl.glslversion;
uniformblockalignment = gl.uniformblockalignment;
maxuniformblock = gl.maxuniformblock;
vendorstring = gl.vendorstring;
if (first)
{
first=false;
gl_PrintStartupLog();
}
glDepthFunc(GL_LESS);
glEnable(GL_DITHER);
glDisable(GL_CULL_FACE);
glDisable(GL_POLYGON_OFFSET_FILL);
glEnable(GL_POLYGON_OFFSET_LINE);
glEnable(GL_BLEND);
glEnable(GL_DEPTH_CLAMP);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LINE_SMOOTH);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
SetViewportRects(nullptr);
mVertexData = new FFlatVertexBuffer(GetWidth(), GetHeight());
mSkyData = new FSkyVertexBuffer;
mViewpoints = new HWViewpointBuffer;
mLights = new FLightBuffer();
GLRenderer = new FGLRenderer(this);
GLRenderer->Initialize(GetWidth(), GetHeight());
static_cast<GLDataBuffer*>(mLights->GetBuffer())->BindBase();
mDebug = std::make_shared<FGLDebug>();
mDebug->Update();
}
//==========================================================================
//
// Updates the screen
//
//==========================================================================
void OpenGLFrameBuffer::Update()
{
twoD.Reset();
Flush3D.Reset();
Flush3D.Clock();
GLRenderer->Flush();
Flush3D.Unclock();
Swap();
Super::Update();
}
//===========================================================================
//
// Render the view to a savegame picture
//
//===========================================================================
void OpenGLFrameBuffer::WriteSavePic(player_t *player, FileWriter *file, int width, int height)
{
if (!V_IsHardwareRenderer())
Super::WriteSavePic(player, file, width, height);
else if (GLRenderer != nullptr)
GLRenderer->WriteSavePic(player, file, width, height);
}
//===========================================================================
//
//
//
//===========================================================================
sector_t *OpenGLFrameBuffer::RenderView(player_t *player)
{
if (GLRenderer != nullptr)
return GLRenderer->RenderView(player);
return nullptr;
}
//===========================================================================
//
//
//
//===========================================================================
uint32_t OpenGLFrameBuffer::GetCaps()
{
if (!V_IsHardwareRenderer())
return Super::GetCaps();
// describe our basic feature set
ActorRenderFeatureFlags FlagSet = RFF_FLATSPRITES | RFF_MODELS | RFF_SLOPE3DFLOORS |
RFF_TILTPITCH | RFF_ROLLSPRITES | RFF_POLYGONAL | RFF_MATSHADER | RFF_POSTSHADER | RFF_BRIGHTMAP;
if (r_drawvoxels)
FlagSet |= RFF_VOXELS;
if (gl_tonemap != 5) // not running palette tonemap shader
FlagSet |= RFF_TRUECOLOR;
return (uint32_t)FlagSet;
}
const char* OpenGLFrameBuffer::DeviceName() const
{
return gl.modelstring;
}
//==========================================================================
//
// Swap the buffers
//
//==========================================================================
CVAR(Bool, gl_finishbeforeswap, false, CVAR_ARCHIVE|CVAR_GLOBALCONFIG);
void OpenGLFrameBuffer::Swap()
{
bool swapbefore = gl_finishbeforeswap && camtexcount == 0;
Finish.Reset();
Finish.Clock();
if (swapbefore) glFinish();
FPSLimit();
SwapBuffers();
if (!swapbefore) glFinish();
Finish.Unclock();
camtexcount = 0;
FHardwareTexture::UnbindAll();
mDebug->Update();
}
//==========================================================================
//
// Enable/disable vertical sync
//
//==========================================================================
void OpenGLFrameBuffer::SetVSync(bool vsync)
{
// Switch to the default frame buffer because some drivers associate the vsync state with the bound FB object.
GLint oldDrawFramebufferBinding = 0, oldReadFramebufferBinding = 0;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &oldDrawFramebufferBinding);
glGetIntegerv(GL_READ_FRAMEBUFFER_BINDING, &oldReadFramebufferBinding);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
Super::SetVSync(vsync);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, oldDrawFramebufferBinding);
glBindFramebuffer(GL_READ_FRAMEBUFFER, oldReadFramebufferBinding);
}
//===========================================================================
//
//
//===========================================================================
void OpenGLFrameBuffer::CleanForRestart()
{
if (GLRenderer)
GLRenderer->ResetSWScene();
}
void OpenGLFrameBuffer::SetTextureFilterMode()
{
if (GLRenderer != nullptr && GLRenderer->mSamplerManager != nullptr) GLRenderer->mSamplerManager->SetTextureFilterMode();
}
IHardwareTexture *OpenGLFrameBuffer::CreateHardwareTexture()
{
return new FHardwareTexture(true/*tex->bNoCompress*/);
}
void OpenGLFrameBuffer::PrecacheMaterial(FMaterial *mat, int translation)
{
auto tex = mat->tex;
if (tex->isSWCanvas()) return;
// Textures that are already scaled in the texture lump will not get replaced by hires textures.
int flags = mat->isExpanded() ? CTF_Expand : (gl_texture_usehires && !tex->isScaled()) ? CTF_CheckHires : 0;
int numLayers = mat->GetLayers();
auto base = static_cast<FHardwareTexture*>(mat->GetLayer(0, translation));
if (base->BindOrCreate(tex, 0, CLAMP_NONE, translation, flags))
{
for (int i = 1; i < numLayers; i++)
{
FTexture *layer;
auto systex = static_cast<FHardwareTexture*>(mat->GetLayer(i, 0, &layer));
systex->BindOrCreate(layer, i, CLAMP_NONE, 0, mat->isExpanded() ? CTF_Expand : 0);
}
}
// unbind everything.
FHardwareTexture::UnbindAll();
}
FModelRenderer *OpenGLFrameBuffer::CreateModelRenderer(int mli)
{
return new FHWModelRenderer(nullptr, gl_RenderState, mli);
}
IVertexBuffer *OpenGLFrameBuffer::CreateVertexBuffer()
{
return new GLVertexBuffer;
}
IIndexBuffer *OpenGLFrameBuffer::CreateIndexBuffer()
{
return new GLIndexBuffer;
}
IDataBuffer *OpenGLFrameBuffer::CreateDataBuffer(int bindingpoint, bool ssbo, bool needsresize)
{
return new GLDataBuffer(bindingpoint, ssbo);
}
void OpenGLFrameBuffer::TextureFilterChanged()
{
if (GLRenderer != NULL && GLRenderer->mSamplerManager != NULL) GLRenderer->mSamplerManager->SetTextureFilterMode();
}
void OpenGLFrameBuffer::BlurScene(float amount)
{
GLRenderer->BlurScene(amount);
}
void OpenGLFrameBuffer::SetViewportRects(IntRect *bounds)
{
Super::SetViewportRects(bounds);
if (!bounds)
{
auto vrmode = VRMode::GetVRMode(true);
vrmode->AdjustViewport(this);
}
}
void OpenGLFrameBuffer::UpdatePalette()
{
if (GLRenderer)
GLRenderer->ClearTonemapPalette();
}
//===========================================================================
//
//
//
//===========================================================================
void OpenGLFrameBuffer::BeginFrame()
{
SetViewportRects(nullptr);
if (GLRenderer != nullptr)
GLRenderer->BeginFrame();
}
//===========================================================================
//
// Takes a screenshot
//
//===========================================================================
TArray<uint8_t> OpenGLFrameBuffer::GetScreenshotBuffer(int &pitch, ESSType &color_type, float &gamma)
{
const auto &viewport = mOutputLetterbox;
// Grab what is in the back buffer.
// We cannot rely on SCREENWIDTH/HEIGHT here because the output may have been scaled.
TArray<uint8_t> pixels;
pixels.Resize(viewport.width * viewport.height * 3);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(viewport.left, viewport.top, viewport.width, viewport.height, GL_RGB, GL_UNSIGNED_BYTE, &pixels[0]);
glPixelStorei(GL_PACK_ALIGNMENT, 4);
// Copy to screenshot buffer:
int w = SCREENWIDTH;
int h = SCREENHEIGHT;
TArray<uint8_t> ScreenshotBuffer(w * h * 3, true);
float rcpWidth = 1.0f / w;
float rcpHeight = 1.0f / h;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
float u = (x + 0.5f) * rcpWidth;
float v = (y + 0.5f) * rcpHeight;
int sx = u * viewport.width;
int sy = v * viewport.height;
int sindex = (sx + sy * viewport.width) * 3;
int dindex = (x + (h - y - 1) * w) * 3;
ScreenshotBuffer[dindex] = pixels[sindex];
ScreenshotBuffer[dindex + 1] = pixels[sindex + 1];
ScreenshotBuffer[dindex + 2] = pixels[sindex + 2];
}
}
pitch = w * 3;
color_type = SS_RGB;
// Screenshot should not use gamma correction if it was already applied to rendered image
gamma = 1;
if (vid_hdr_active && fullscreen)
gamma *= 2.2f;
return ScreenshotBuffer;
}
//===========================================================================
//
// 2D drawing
//
//===========================================================================
void OpenGLFrameBuffer::Draw2D()
{
if (GLRenderer != nullptr)
{
GLRenderer->mBuffers->BindCurrentFB();
::Draw2D(&m2DDrawer, gl_RenderState);
}
}
void OpenGLFrameBuffer::PostProcessScene(int fixedcm, const std::function<void()> &afterBloomDrawEndScene2D)
{
GLRenderer->PostProcessScene(fixedcm, afterBloomDrawEndScene2D);
}
//==========================================================================
//
// OpenGLFrameBuffer :: WipeStartScreen
//
// Called before the current screen has started rendering. This needs to
// save what was drawn the previous frame so that it can be animated into
// what gets drawn this frame.
//
//==========================================================================
FTexture *OpenGLFrameBuffer::WipeStartScreen()
{
const auto &viewport = screen->mScreenViewport;
auto tex = new FWrapperTexture(viewport.width, viewport.height, 1);
tex->GetSystemTexture()->CreateTexture(nullptr, viewport.width, viewport.height, 0, false, 0, "WipeStartScreen");
glFinish();
static_cast<FHardwareTexture*>(tex->GetSystemTexture())->Bind(0, false);
GLRenderer->mBuffers->BindCurrentFB();
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, viewport.left, viewport.top, viewport.width, viewport.height);
return tex;
}
//==========================================================================
//
// OpenGLFrameBuffer :: WipeEndScreen
//
// The screen we want to animate to has just been drawn.
//
//==========================================================================
FTexture *OpenGLFrameBuffer::WipeEndScreen()
{
GLRenderer->Flush();
const auto &viewport = screen->mScreenViewport;
auto tex = new FWrapperTexture(viewport.width, viewport.height, 1);
tex->GetSystemTexture()->CreateTexture(NULL, viewport.width, viewport.height, 0, false, 0, "WipeEndScreen");
glFinish();
static_cast<FHardwareTexture*>(tex->GetSystemTexture())->Bind(0, false);
GLRenderer->mBuffers->BindCurrentFB();
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, viewport.left, viewport.top, viewport.width, viewport.height);
return tex;
}
}