hello world

neo/renderer/RenderSystem.h

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+/*
+===========================================================================
+
+Doom 3 GPL Source Code
+Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company. 
+
+This file is part of the Doom 3 GPL Source Code (?Doom 3 Source Code?).  
+
+Doom 3 Source Code is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+Doom 3 Source Code 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.
+
+If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
+
+===========================================================================
+*/
+
+#ifndef __RENDERER_H__
+#define __RENDERER_H__
+
+/*
+===============================================================================
+
+	idRenderSystem is responsible for managing the screen, which can have
+	multiple idRenderWorld and 2D drawing done on it.
+
+===============================================================================
+*/
+
+
+// Contains variables specific to the OpenGL configuration being run right now.
+// These are constant once the OpenGL subsystem is initialized.
+typedef struct glconfig_s {
+	const char			*renderer_string;
+	const char			*vendor_string;
+	const char			*version_string;
+	const char			*extensions_string;
+	const char			*wgl_extensions_string;
+
+	float				glVersion;				// atof( version_string )
+
+
+	int					maxTextureSize;			// queried from GL
+	int					maxTextureUnits;
+	int					maxTextureCoords;
+	int					maxTextureImageUnits;
+	float				maxTextureAnisotropy;
+
+	int					colorBits, depthBits, stencilBits;
+
+	bool				multitextureAvailable;
+	bool				textureCompressionAvailable;
+	bool				anisotropicAvailable;
+	bool				textureLODBiasAvailable;
+	bool				textureEnvAddAvailable;
+	bool				textureEnvCombineAvailable;
+	bool				registerCombinersAvailable;
+	bool				cubeMapAvailable;
+	bool				envDot3Available;
+	bool				texture3DAvailable;
+	bool				sharedTexturePaletteAvailable;
+	bool				ARBVertexBufferObjectAvailable;
+	bool				ARBVertexProgramAvailable;
+	bool				ARBFragmentProgramAvailable;
+	bool				twoSidedStencilAvailable;
+	bool				textureNonPowerOfTwoAvailable;
+	bool				depthBoundsTestAvailable;
+
+	// ati r200 extensions
+	bool				atiFragmentShaderAvailable;
+
+	// ati r300
+	bool				atiTwoSidedStencilAvailable;
+
+	int					vidWidth, vidHeight;	// passed to R_BeginFrame
+
+	int					displayFrequency;
+
+	bool				isFullscreen;
+
+	bool				allowNV30Path;
+	bool				allowNV20Path;
+	bool				allowNV10Path;
+	bool				allowR200Path;
+	bool				allowARB2Path;
+
+	bool				isInitialized;
+} glconfig_t;
+
+
+// font support 
+const int GLYPH_START			= 0;
+const int GLYPH_END				= 255;
+const int GLYPH_CHARSTART		= 32;
+const int GLYPH_CHAREND			= 127;
+const int GLYPHS_PER_FONT		= GLYPH_END - GLYPH_START + 1;
+
+typedef struct {
+	int					height;			// number of scan lines
+	int					top;			// top of glyph in buffer
+	int					bottom;			// bottom of glyph in buffer
+	int					pitch;			// width for copying
+	int					xSkip;			// x adjustment
+	int					imageWidth;		// width of actual image
+	int					imageHeight;	// height of actual image
+	float				s;				// x offset in image where glyph starts
+	float				t;				// y offset in image where glyph starts
+	float				s2;
+	float				t2;
+	const idMaterial *	glyph;			// shader with the glyph
+	char				shaderName[32];
+} glyphInfo_t;
+
+typedef struct {
+	glyphInfo_t			glyphs [GLYPHS_PER_FONT];
+	float				glyphScale;
+	char				name[64];
+} fontInfo_t;
+
+typedef struct {
+	fontInfo_t			fontInfoSmall;
+	fontInfo_t			fontInfoMedium;
+	fontInfo_t			fontInfoLarge;
+	int					maxHeight;
+	int					maxWidth;
+	int					maxHeightSmall;
+	int					maxWidthSmall;
+	int					maxHeightMedium;
+	int					maxWidthMedium;
+	int					maxHeightLarge;
+	int					maxWidthLarge;
+	char				name[64];
+} fontInfoEx_t;
+
+const int SMALLCHAR_WIDTH		= 8;
+const int SMALLCHAR_HEIGHT		= 16;
+const int BIGCHAR_WIDTH			= 16;
+const int BIGCHAR_HEIGHT		= 16;
+
+// all drawing is done to a 640 x 480 virtual screen size
+// and will be automatically scaled to the real resolution
+const int SCREEN_WIDTH			= 640;
+const int SCREEN_HEIGHT			= 480;
+
+class idRenderWorld;
+
+
+class idRenderSystem {
+public:
+
+	virtual					~idRenderSystem() {}
+
+	// set up cvars and basic data structures, but don't
+	// init OpenGL, so it can also be used for dedicated servers
+	virtual void			Init( void ) = 0;
+
+	// only called before quitting
+	virtual void			Shutdown( void ) = 0;
+
+	virtual void			InitOpenGL( void ) = 0;
+
+	virtual void			ShutdownOpenGL( void ) = 0;
+
+	virtual bool			IsOpenGLRunning( void ) const = 0;
+
+	virtual bool			IsFullScreen( void ) const = 0;
+	virtual int				GetScreenWidth( void ) const = 0;
+	virtual int				GetScreenHeight( void ) const = 0;
+
+	// allocate a renderWorld to be used for drawing
+	virtual idRenderWorld *	AllocRenderWorld( void ) = 0;
+	virtual	void			FreeRenderWorld( idRenderWorld * rw ) = 0;
+
+	// All data that will be used in a level should be
+	// registered before rendering any frames to prevent disk hits,
+	// but they can still be registered at a later time
+	// if necessary.
+	virtual void			BeginLevelLoad( void ) = 0;
+	virtual void			EndLevelLoad( void ) = 0;
+
+	// font support
+	virtual bool			RegisterFont( const char *fontName, fontInfoEx_t &font ) = 0;
+
+	// GUI drawing just involves shader parameter setting and axial image subsections
+	virtual void			SetColor( const idVec4 &rgba ) = 0;
+	virtual void			SetColor4( float r, float g, float b, float a ) = 0;
+
+	virtual void			DrawStretchPic( const idDrawVert *verts, const glIndex_t *indexes, int vertCount, int indexCount, const idMaterial *material,
+											bool clip = true, float min_x = 0.0f, float min_y = 0.0f, float max_x = 640.0f, float max_y = 480.0f ) = 0;
+	virtual void			DrawStretchPic( float x, float y, float w, float h, float s1, float t1, float s2, float t2, const idMaterial *material ) = 0;
+
+	virtual void			DrawStretchTri ( idVec2 p1, idVec2 p2, idVec2 p3, idVec2 t1, idVec2 t2, idVec2 t3, const idMaterial *material ) = 0;
+	virtual void			GlobalToNormalizedDeviceCoordinates( const idVec3 &global, idVec3 &ndc ) = 0;
+	virtual void			GetGLSettings( int& width, int& height ) = 0;
+	virtual void			PrintMemInfo( MemInfo_t *mi ) = 0;
+
+	virtual void			DrawSmallChar( int x, int y, int ch, const idMaterial *material ) = 0;
+	virtual void			DrawSmallStringExt( int x, int y, const char *string, const idVec4 &setColor, bool forceColor, const idMaterial *material ) = 0;
+	virtual void			DrawBigChar( int x, int y, int ch, const idMaterial *material ) = 0;
+	virtual void			DrawBigStringExt( int x, int y, const char *string, const idVec4 &setColor, bool forceColor, const idMaterial *material ) = 0;
+
+	// dump all 2D drawing so far this frame to the demo file
+	virtual void			WriteDemoPics() = 0;
+
+	// draw the 2D pics that were saved out with the current demo frame
+	virtual void			DrawDemoPics() = 0;
+
+	// FIXME: add an interface for arbitrary point/texcoord drawing
+
+
+	// a frame cam consist of 2D drawing and potentially multiple 3D scenes
+	// window sizes are needed to convert SCREEN_WIDTH / SCREEN_HEIGHT values
+	virtual void			BeginFrame( int windowWidth, int windowHeight ) = 0;
+
+	// if the pointers are not NULL, timing info will be returned
+	virtual void			EndFrame( int *frontEndMsec, int *backEndMsec ) = 0;
+
+	// aviDemo uses this.
+	// Will automatically tile render large screen shots if necessary
+	// Samples is the number of jittered frames for anti-aliasing
+	// If ref == NULL, session->updateScreen will be used
+	// This will perform swapbuffers, so it is NOT an approppriate way to
+	// generate image files that happen during gameplay, as for savegame
+	// markers.  Use WriteRender() instead.
+	virtual void			TakeScreenshot( int width, int height, const char *fileName, int samples, struct renderView_s *ref ) = 0;
+
+	// the render output can be cropped down to a subset of the real screen, as
+	// for save-game reviews and split-screen multiplayer.  Users of the renderer
+	// will not know the actual pixel size of the area they are rendering to
+
+	// the x,y,width,height values are in virtual SCREEN_WIDTH / SCREEN_HEIGHT coordinates
+
+	// to render to a texture, first set the crop size with makePowerOfTwo = true,
+	// then perform all desired rendering, then capture to an image
+	// if the specified physical dimensions are larger than the current cropped region, they will be cut down to fit
+	virtual void			CropRenderSize( int width, int height, bool makePowerOfTwo = false, bool forceDimensions = false ) = 0;
+	virtual void			CaptureRenderToImage( const char *imageName ) = 0;
+	// fixAlpha will set all the alpha channel values to 0xff, which allows screen captures
+	// to use the default tga loading code without having dimmed down areas in many places
+	virtual void			CaptureRenderToFile( const char *fileName, bool fixAlpha = false ) = 0;
+	virtual void			UnCrop() = 0;
+	virtual void			GetCardCaps( bool &oldCard, bool &nv10or20 ) = 0;
+
+	// the image has to be already loaded ( most straightforward way would be through a FindMaterial )
+	// texture filter / mipmapping / repeat won't be modified by the upload
+	// returns false if the image wasn't found
+	virtual bool			UploadImage( const char *imageName, const byte *data, int width, int height ) = 0;
+};
+
+extern idRenderSystem *			renderSystem;
+
+//
+// functions mainly intended for editor and dmap integration
+//
+
+// returns the frustum planes in world space
+void R_RenderLightFrustum( const struct renderLight_s &renderLight, idPlane lightFrustum[6] );
+
+// for use by dmap to do the carving-on-light-boundaries and for the editor for display
+void R_LightProjectionMatrix( const idVec3 &origin, const idPlane &rearPlane, idVec4 mat[4] );
+
+// used by the view shot taker
+void R_ScreenshotFilename( int &lastNumber, const char *base, idStr &fileName );
+
+#endif /* !__RENDERER_H__ */