glR_Backend_Runtime: Move framebuffer and program pipeline to HW.

Also provide more modern clear functions.

Author: CrossVR

src/Layers/xrRender/HW.h

@@ -58,7 +58,10 @@ class  CHW
 #if defined(USE_OGL)
 public:
 	CHW*					pDevice;
+	GLuint					pBaseRT;
 	GLuint					pBaseZB;
+	GLuint					pFB;
+	GLuint					pPP;
 
 	CHWCaps					Caps;
 
@@ -128,6 +131,12 @@ class  CHW
 	virtual	void	OnAppActivate();
 	virtual void	OnAppDeactivate();
 #endif
+#ifdef USE_OGL
+	// TODO: OGL: Implement this into a compatibility layer?
+	void ClearRenderTargetView(GLuint pRenderTargetView, const FLOAT ColorRGBA[4]);
+	void ClearDepthStencilView(GLuint pDepthStencilView, UINT ClearFlags, FLOAT Depth, UINT8 Stencil);
+#endif // USE_OGL
+
 
 private:
 	bool					m_move_window;

src/Layers/xrRender/R_Backend.cpp

@@ -161,10 +161,6 @@ void CBackend::OnDeviceCreate	()
 #if defined(USE_DX10) || defined(USE_DX11)
 	//CreateConstantBuffers();
 #endif	//	USE_DX10
-#ifdef USE_OGL
-	// Create the program pipeline used for rendering with shaders
-	glGenProgramPipelines(1, &pp);
-#endif // USE_OGL
 
 	CreateQuadIB		();
 
@@ -193,9 +189,6 @@ void CBackend::OnDeviceDestroy()
 #if defined(USE_DX10) || defined(USE_DX11)
 	//DestroyConstantBuffers();
 #endif	//	USE_DX10
-#ifdef USE_OGL
-	glDeleteProgramPipelines(1, &pp);
-#endif // USE_OGL
 }
 
 #if defined(USE_DX10) || defined(USE_DX11)

src/Layers/xrRender/R_Backend.h

@@ -93,7 +93,6 @@ class  ECORE_API CBackend
 private:
 	// Render-targets
 #ifdef USE_OGL
-	GLuint							pFB;
 	GLuint							pRT[4];
 	GLuint							pZB;
 #else
@@ -123,7 +122,6 @@ class  ECORE_API CBackend
 	// Shaders/State
 #ifdef USE_OGL
 	SState*							state;
-	GLuint							pp;
 	GLuint							ps;
 	GLuint							vs;
 #else
@@ -253,10 +251,8 @@ class  ECORE_API CBackend
 	IC	const Fmatrix&				get_xform_project	();
 
 #ifdef USE_OGL
-	IC	void						set_FB				(GLuint FB=0);
 	IC	void						set_RT				(GLuint RT, u32 ID=0);
 	IC	void						set_ZB				(GLuint ZB);
-	IC	GLuint						get_FB				();
 	IC	GLuint						get_RT				(u32 ID=0);
 	IC	GLuint						get_ZB				();
 #else

src/Layers/xrRender/xrD3DDefs.h

@@ -3,11 +3,18 @@
 #pragma once
 
 #if defined(USE_OGL)
-using namespace gl;
-class glState;
+
 // TODO: Get rid of D3D types.
 #include <d3d9types.h>
 
+using namespace gl;
+class glState;
+
+typedef enum D3D_CLEAR_FLAG {
+	D3D_CLEAR_DEPTH = 0x1L,
+	D3D_CLEAR_STENCIL = 0x2L
+} D3D_CLEAR_FLAG;
+
 #define DX10_ONLY(expr)			do {} while (0)
 
 #elif defined(USE_DX11) || defined(USE_DX10)

src/Layers/xrRenderGL/glHW.cpp

@@ -38,7 +38,10 @@ CHW::CHW() :
 	m_hRC(NULL),
 	pDevice(this),
 	m_move_window(true),
-	pBaseZB(0)
+	pBaseRT(0),
+	pBaseZB(0),
+	pPP(0),
+	pFB(0)
 {
 }
 
@@ -129,6 +132,9 @@ void CHW::CreateDevice( HWND hWnd, bool move_window )
 	// TODO: Fix these differences in the blenders/shaders.
 	CHK_GL(glClipControl(GL_UPPER_LEFT, GL_ZERO_TO_ONE));
 
+	//	Create render target and depth-stencil views here
+	UpdateViews();
+
 #ifndef _EDITOR
 	updateWindowProps							(m_hWnd);
 	fill_vid_mode_list							(this);
@@ -168,7 +174,11 @@ void CHW::Reset (HWND hwnd)
 {
 	BOOL	bWindowed		= !psDeviceFlags.is	(rsFullscreen);
 
-	CHK_GL(glDeleteTextures(1, &HW.pBaseZB));
+	CHK_GL(glDeleteProgramPipelines(1, &pPP));
+	CHK_GL(glDeleteFramebuffers(1, &pFB));
+
+	CHK_GL(glDeleteTextures(1, &pBaseRT));
+	CHK_GL(glDeleteTextures(1, &pBaseZB));
 
 	UpdateViews();
 
@@ -322,9 +332,57 @@ void fill_vid_mode_list()
 
 void CHW::UpdateViews()
 {
-	// Create an staging depth buffer used for post-processing
+	// Create the program pipeline used for rendering with shaders
+	glGenProgramPipelines(1, &pPP);
+	CHK_GL(glBindProgramPipeline(pPP));
+
+	// Create the framebuffer
+	glGenFramebuffers(1, &pFB);
+	CHK_GL(glBindFramebuffer(GL_FRAMEBUFFER, pFB));
+
+	// Create a render target view
+	// We reserve a texture name to represent GL_BACK
+	glGenTextures(1, &HW.pBaseRT);
+
+	// Create Depth/stencil buffer
 	glGenTextures(1, &HW.pBaseZB);
 	CHK_GL(glBindTexture(GL_TEXTURE_2D, HW.pBaseZB));
 	CHK_GL(glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH24_STENCIL8, Device.dwWidth, Device.dwHeight));
 }
+
+
+void CHW::ClearRenderTargetView(GLuint pRenderTargetView, const FLOAT ColorRGBA[4])
+{
+	// TODO: OGL: Bind the RT to a clear frame buffer.
+	glPushAttrib(GL_COLOR_BUFFER_BIT);
+	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+	glClearColor(ColorRGBA[0], ColorRGBA[1], ColorRGBA[2], ColorRGBA[3]);
+	CHK_GL(glClear(GL_COLOR_BUFFER_BIT));
+	glPopAttrib();
+}
+
+void CHW::ClearDepthStencilView(GLuint pDepthStencilView, UINT ClearFlags, FLOAT Depth, UINT8 Stencil)
+{
+	// TODO: OGL: Bind the DS to a clear frame buffer.
+	u32 mask = 0;
+	if (ClearFlags & D3D_CLEAR_DEPTH)
+		mask |= (u32)GL_DEPTH_BUFFER_BIT;
+	if (ClearFlags & D3D_CLEAR_STENCIL)
+		mask |= (u32)GL_STENCIL_BUFFER_BIT;
+
+
+	glPushAttrib((AttribMask)mask);
+	if (ClearFlags & D3DCLEAR_ZBUFFER)
+	{
+		glDepthMask(GL_TRUE);
+		glClearDepthf(Depth);
+	}
+	if (ClearFlags & D3DCLEAR_STENCIL)
+	{
+		glStencilMask(~0);
+		glClearStencil(Stencil);
+	}
+	CHK_GL(glClear((ClearBufferMask)mask));
+	glPopAttrib();
+}
 #endif

src/Layers/xrRenderGL/glR_Backend_Runtime.h

@@ -4,31 +4,13 @@
 
 #include "glStateUtils.h"
 
-IC	GLuint CBackend::get_FB()
-{
-	return pFB;
-}
-
 IC void		CBackend::set_xform(u32 ID, const Fmatrix& M)
 {
 	stat.xforms++;
 	//	TODO: OGL: Implement CBackend::set_xform
 	//VERIFY(!"Implement CBackend::set_xform");
 }
 
-IC void	CBackend::set_FB(GLuint FB)
-{
-	if (FB != pFB)
-	{
-		PGO(Msg("PGO:set_FB"));
-		pFB = FB;
-		CHK_GL(glBindFramebuffer(GL_FRAMEBUFFER, pFB));
-
-		// Clear cached attachments
-		pRT[0] = pRT[1] = pRT[2] = pRT[3] = pZB = NULL;
-	}
-}
-
 IC void CBackend::set_RT(GLuint RT, u32 ID)
 {
 	if (RT != pRT[ID])
@@ -76,7 +58,7 @@ ICF void CBackend::set_PS(GLuint _ps, LPCSTR _n)
 		PGO(Msg("PGO:Pshader:%d,%s", _ps, _n ? _n : name));
 		stat.ps++;
 		ps = _ps;
-		CHK_GL(glUseProgramStages(pp, GL_FRAGMENT_SHADER_BIT, ps));
+		CHK_GL(glUseProgramStages(HW.pPP, GL_FRAGMENT_SHADER_BIT, ps));
 #ifdef DEBUG
 		ps_name = _n;
 #endif
@@ -92,7 +74,7 @@ ICF void CBackend::set_VS(GLuint _vs, LPCSTR _n)
 		PGO(Msg("PGO:Vshader:%d,%s", _vs, _n ? _n : name));
 		stat.vs++;
 		vs = _vs;
-		CHK_GL(glUseProgramStages(pp, GL_VERTEX_SHADER_BIT, vs));
+		CHK_GL(glUseProgramStages(HW.pPP, GL_VERTEX_SHADER_BIT, vs));
 #ifdef DEBUG
 		vs_name = _n;
 #endif
@@ -179,7 +161,6 @@ ICF void CBackend::Render(D3DPRIMITIVETYPE T, u32 baseV, u32 startV, u32 countV,
 	stat.verts += countV;
 	stat.polys += PC;
 	constants.flush();
-	CHK_GL(glBindProgramPipeline(pp));
 	CHK_GL(glDrawElementsBaseVertex(Topology, iIndexCount, GL_UNSIGNED_SHORT, (void*)(startI * sizeof(GLushort)), baseV));
 	PGO(Msg("PGO:DIP:%dv/%df", countV, PC));
 }
@@ -193,7 +174,6 @@ ICF void CBackend::Render(D3DPRIMITIVETYPE T, u32 startV, u32 PC)
 	stat.verts += iIndexCount;
 	stat.polys += PC;
 	constants.flush();
-	CHK_GL(glBindProgramPipeline(pp));
 	CHK_GL(glDrawArrays(Topology, startV, iIndexCount));
 	PGO(Msg("PGO:DIP:%dv/%df", iIndexCount, PC));
 }