- fix gamepic render buffer issues

src/g_game.cpp

@@ -82,9 +82,6 @@
 static FRandom pr_dmspawn ("DMSpawn");
 static FRandom pr_pspawn ("PlayerSpawn");
 
-const int SAVEPICWIDTH = 216;
-const int SAVEPICHEIGHT = 162;
-
 bool	G_CheckDemoStatus (void);
 void	G_ReadDemoTiccmd (ticcmd_t *cmd, int player);
 void	G_WriteDemoTiccmd (ticcmd_t *cmd, int player, int buf);

src/g_game.h

@@ -102,5 +102,7 @@ class AInventory;
 extern const AInventory *SendItemUse, *SendItemDrop;
 extern int SendItemDropAmount;
 
+const int SAVEPICWIDTH = 216;
+const int SAVEPICHEIGHT = 162;
 
 #endif

src/gl/renderer/gl_renderer.cpp

@@ -35,6 +35,7 @@
 #include "p_effect.h"
 #include "d_player.h"
 #include "a_dynlight.h"
+#include "g_game.h"
 #include "swrenderer/r_swscene.h"
 #include "hwrenderer/utility/hw_clock.h"
 
@@ -96,6 +97,8 @@ FGLRenderer::FGLRenderer(OpenGLFrameBuffer *fb)
 	mLights = nullptr;
 	mTonemapPalette = nullptr;
 	mBuffers = nullptr;
+	mScreenBuffers = nullptr;
+	mSaveBuffers = nullptr;
 	mPresentShader = nullptr;
 	mPresent3dCheckerShader = nullptr;
 	mPresent3dColumnShader = nullptr;
@@ -122,7 +125,9 @@ FGLRenderer::FGLRenderer(OpenGLFrameBuffer *fb)
 
 void FGLRenderer::Initialize(int width, int height)
 {
-	mBuffers = new FGLRenderBuffers();
+	mScreenBuffers = new FGLRenderBuffers();
+	mSaveBuffers = new FGLRenderBuffers();
+	mBuffers = mScreenBuffers;
 	mLinearDepthShader = new FLinearDepthShader();
 	mDepthBlurShader = new FDepthBlurShader();
 	mSSAOShader = new FSSAOShader();
@@ -400,7 +405,9 @@ void FGLRenderer::WriteSavePic(player_t *player, FileWriter *file, int width, in
 
 void FGLRenderer::BeginFrame()
 {
-	buffersActive = GLRenderer->mBuffers->Setup(screen->mScreenViewport.width, screen->mScreenViewport.height, screen->mSceneViewport.width, screen->mSceneViewport.height);
+	buffersActive = GLRenderer->mScreenBuffers->Setup(screen->mScreenViewport.width, screen->mScreenViewport.height, screen->mSceneViewport.width, screen->mSceneViewport.height);
+	if (buffersActive)
+		buffersActive = GLRenderer->mSaveBuffers->Setup(SAVEPICWIDTH, SAVEPICHEIGHT, SAVEPICWIDTH, SAVEPICHEIGHT);
 }
 
 //===========================================================================

src/gl/renderer/gl_renderer.h

@@ -100,6 +100,8 @@ public:
 	int mOldFBID;
 
 	FGLRenderBuffers *mBuffers;
+	FGLRenderBuffers *mScreenBuffers;
+	FGLRenderBuffers *mSaveBuffers;
 	FLinearDepthShader *mLinearDepthShader;
 	FSSAOShader *mSSAOShader;
 	FDepthBlurShader *mDepthBlurShader;

src/gl/scene/gl_scene.cpp

@@ -656,7 +656,7 @@ sector_t * GLSceneDrawer::RenderViewpoint (AActor * camera, IntRect * bounds, fl
 			SetFixedColormap(camera->player); // reiterate color map for each eye, so night vision goggles work in both eyes
 		const s3d::EyePose * eye = stereo3dMode.getEyePose(eye_ix);
 		eye->SetUp();
-		screen->SetOutputViewport(bounds);
+		screen->SetViewportRects(bounds);
 		Set3DViewport(mainview);
 		GLRenderer->mDrawingScene2D = true;
 		GLRenderer->mCurrentFoV = fov;
@@ -713,20 +713,24 @@ sector_t * GLSceneDrawer::RenderViewpoint (AActor * camera, IntRect * bounds, fl
 void GLSceneDrawer::WriteSavePic (player_t *player, FileWriter *file, int width, int height)
 {
 	IntRect bounds;
+	bounds.left = 0;
+	bounds.top = 0;
+	bounds.width = width;
+	bounds.height = height;
+
+	// if GLRenderer->mVBO is persistently mapped we must be sure the GPU finished reading from it before we fill it with new data.
+	glFinish();
+
+	// Switch to render buffers dimensioned for the savepic
+	GLRenderer->mBuffers = GLRenderer->mSaveBuffers;
 
 	P_FindParticleSubsectors();	// make sure that all recently spawned particles have a valid subsector.
-	bounds.left=0;
-	bounds.top=0;
-	bounds.width=width;
-	bounds.height=height;
-	glFlush();
 	SetFixedColormap(player);
 	gl_RenderState.SetVertexBuffer(GLRenderer->mVBO);
 	GLRenderer->mVBO->Reset();
 	if (!gl.legacyMode) GLRenderer->mLights->Clear();
 
-	sector_t *viewsector = RenderViewpoint(players[consoleplayer].camera, &bounds,
-								r_viewpoint.FieldOfView.Degrees, 1.6f, 1.6f, true, false);
+	sector_t *viewsector = RenderViewpoint(players[consoleplayer].camera, &bounds, r_viewpoint.FieldOfView.Degrees, 1.6f, 1.6f, true, false);
 	glDisable(GL_STENCIL_TEST);
 	gl_RenderState.SetFixedColormap(CM_DEFAULT);
 	gl_RenderState.SetSoftLightLevel(-1);
@@ -737,12 +741,16 @@ void GLSceneDrawer::WriteSavePic (player_t *player, FileWriter *file, int width,
 		screen->Draw2D();
 	}
 	GLRenderer->CopyToBackbuffer(&bounds, false);
-	glFlush();
 
-	screen->SetOutputViewport(nullptr);
+	// strictly speaking not needed as the glReadPixels should block until the scene is rendered, but this is to safeguard against shitty drivers
+	glFinish();
 
 	uint8_t * scr = (uint8_t *)M_Malloc(width * height * 3);
 	glReadPixels(0,0,width, height,GL_RGB,GL_UNSIGNED_BYTE,scr);
 	M_CreatePNG (file, scr + ((height-1) * width * 3), NULL, SS_RGB, width, height, -width * 3, Gamma);
 	M_Free(scr);
+
+	// Switch back the screen render buffers
+	screen->SetViewportRects(nullptr);
+	GLRenderer->mBuffers = GLRenderer->mScreenBuffers;
 }

src/gl/system/gl_framebuffer.cpp

@@ -136,7 +136,7 @@ void OpenGLFrameBuffer::InitializeState()
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
 	GLRenderer->Initialize(GetWidth(), GetHeight());
-	SetOutputViewport(nullptr);
+	SetViewportRects(nullptr);
 }
 
 //==========================================================================
@@ -164,14 +164,11 @@ void OpenGLFrameBuffer::Update()
 	int clientHeight = ViewportScaledHeight(initialWidth, initialHeight);
 	if (clientWidth > 0 && clientHeight > 0 && (Width != clientWidth || Height != clientHeight))
 	{
-		// Do not call Resize here because it's only for software canvases
 		Width = clientWidth;
 		Height = clientHeight;
 		V_OutputResized(Width, Height);
 		GLRenderer->mVBO->OutputResized(Width, Height);
 	}
-
-	SetOutputViewport(nullptr);
 }
 
 //===========================================================================
@@ -392,10 +389,11 @@ bool OpenGLFrameBuffer::RenderBuffersEnabled()
 	return FGLRenderBuffers::IsEnabled();
 }
 
-void OpenGLFrameBuffer::SetOutputViewport(IntRect *bounds)
+void OpenGLFrameBuffer::SetViewportRects(IntRect *bounds)
 {
-	Super::SetOutputViewport(bounds);
-	s3d::Stereo3DMode::getCurrentMode().AdjustViewports();
+	Super::SetViewportRects(bounds);
+	if (!bounds)
+		s3d::Stereo3DMode::getCurrentMode().AdjustViewports();
 }
 
 
@@ -431,6 +429,7 @@ void OpenGLFrameBuffer::SetClearColor(int color)
 
 void OpenGLFrameBuffer::BeginFrame()
 {
+	SetViewportRects(nullptr);
 	if (GLRenderer != nullptr)
 		GLRenderer->BeginFrame();
 }

src/gl/system/gl_framebuffer.h

@@ -42,7 +42,7 @@ public:
 	void ResetFixedColormap() override;
 	void BeginFrame() override;
 	bool RenderBuffersEnabled() override;
-	void SetOutputViewport(IntRect *bounds) override;
+	void SetViewportRects(IntRect *bounds) override;
 	void BlurScene(float amount) override;
 
 	// Retrieves a buffer containing image data for a screenshot.

src/v_video.cpp

@@ -1005,7 +1005,7 @@ void DFrameBuffer::WriteSavePic(player_t *player, FileWriter *file, int width, i
 //
 //==========================================================================
 
-void DFrameBuffer::SetOutputViewport(IntRect *bounds)
+void DFrameBuffer::SetViewportRects(IntRect *bounds)
 {
 	if (bounds)
 	{

src/v_video.h

@@ -501,7 +501,7 @@ public:
 	// Calculate gamma table
 	void CalcGamma(float gamma, uint8_t gammalookup[256]);
 
-	virtual void SetOutputViewport(IntRect *bounds);
+	virtual void SetViewportRects(IntRect *bounds);
 	int ScreenToWindowX(int x);
 	int ScreenToWindowY(int y);