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SDK/CHeaders/XPLM/XPLMGraphics.h
#ifndef _XPLMGraphics_h_
#define _XPLMGraphics_h_
/*
* Copyright 2005-2022 Laminar Research, Sandy Barbour and Ben Supnik All
* rights reserved. See license.txt for usage. X-Plane SDK Version: 4.0.0
*
*/
/***************************************************************************
* XPLMGraphics
***************************************************************************/
/*
* A few notes on coordinate systems:
*
* X-Plane uses three kinds of coordinates. Global coordinates are specified
* as latitude, longitude and elevation. This coordinate system never changes
* but is not very precise.
*
* OpenGL (or 'local') coordinates are cartesian and move with the aircraft.
* They offer more precision and are used for 3-d OpenGL drawing. The X axis
* is aligned east-west with positive X meaning east. The Y axis is aligned
* straight up and down at the point 0,0,0 (but since the Earth is round it is
* not truly straight up and down at other points). The Z axis is aligned
* north-south at 0, 0, 0 with positive Z pointing south (but since the Earth
* is round it isn't exactly north-south as you move east or west of 0, 0, 0).
* One unit is one meter and the point 0,0,0 is on the surface of the Earth at
* sea level for some latitude and longitude picked by the sim such that the
* user's aircraft is reasonably nearby.
*
* 2-d Panel coordinates are 2d, with the X axis horizontal and the Y axis
* vertical. The point 0,0 is the bottom left and 1024,768 is the upper
* right of the screen. This is true no matter what resolution the user's
* monitor is in; when running in higher resolution, graphics will be
* scaled.
*
* Use X-Plane's routines to convert between global and local coordinates. Do
* not attempt to do this conversion yourself; the precise 'roundness' of
* X-Plane's physics model may not match your own, and (to make things
* weirder) the user can potentially customize the physics of the current
* planet.
*
*/
#include "XPLMDefs.h"
#ifdef __cplusplus
extern "C" {
#endif
/***************************************************************************
* X-PLANE GRAPHICS
***************************************************************************/
/*
* These routines allow you to use OpenGL with X-Plane.
*
*/
/*
* XPLMTextureID
*
* XPLM Texture IDs name well-known textures in the sim for you to use. This
* allows you to recycle textures from X-Plane, saving VRAM.
*
* *Warning*: do not use these enums. The only remaining use they have is to
* access the legacy compatibility v10 UI texture; if you need this, get it
* via the Widgets library.
*
*/
enum {
/* The bitmap that contains window outlines, button outlines, fonts, etc. */
xplm_Tex_GeneralInterface = 0,
#if defined(XPLM_DEPRECATED)
/* The exterior paint for the user's aircraft (daytime). */
xplm_Tex_AircraftPaint = 1,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* The exterior light map for the user's aircraft. */
xplm_Tex_AircraftLiteMap = 2,
#endif /* XPLM_DEPRECATED */
};
typedef int XPLMTextureID;
/*
* XPLMSetGraphicsState
*
* XPLMSetGraphicsState changes OpenGL's fixed function pipeline state. You
* are not responsible for restoring any state that is accessed via
* XPLMSetGraphicsState, but you are responsible for not accessing this state
* directly.
*
* - inEnableFog - enables or disables fog, equivalent to: glEnable(GL_FOG);
* - inNumberTexUnits - enables or disables a number of multitexturing units.
* If the number is 0, 2d texturing is disabled entirely, as in
* glDisable(GL_TEXTURE_2D); Otherwise, 2d texturing is enabled, and a
* number of multitexturing units are enabled sequentially, starting with
* unit 0, e.g. glActiveTextureARB(GL_TEXTURE0_ARB); glEnable
* (GL_TEXTURE_2D);
* - inEnableLighting - enables or disables OpenGL lighting, e.g.
* glEnable(GL_LIGHTING); glEnable(GL_LIGHT0);
* - inEnableAlphaTesting - enables or disables the alpha test per pixel, e.g.
* glEnable(GL_ALPHA_TEST);
* - inEnableAlphaBlending - enables or disables alpha blending per pixel,
* e.g. glEnable(GL_BLEND);
* - inEnableDepthTesting - enables per pixel depth testing, as in
* glEnable(GL_DEPTH_TEST);
* - inEnableDepthWriting - enables writing back of depth information to the
* depth buffer, as in glDepthMask(GL_TRUE);
*
* The purpose of this function is to change OpenGL state while keeping
* X-Plane aware of the state changes; this keeps X-Plane from getting
* surprised by OGL state changes, and prevents X-Plane and plug-ins from
* having to set all state before all draws; XPLMSetGraphicsState internally
* skips calls to change state that is already properly enabled.
*
* X-Plane does not have a 'default' OGL state for plug-ins with respect to
* the above state vector; plug-ins should totally set OGL state using this
* API before drawing. Use XPLMSetGraphicsState instead of any of the above
* OpenGL calls.
*
* WARNING: Any routine that performs drawing (e.g. XPLMDrawString or widget
* code) may change X-Plane's state. Always set state before drawing after
* unknown code has executed.
*
* *Deprecation Warnings*: X-Plane's lighting and fog environment is
* significantly more complex than the fixed function pipeline can express;
* do not assume that lighting and fog state is a good approximation for 3-d
* drawing. Prefer to use XPLMInstancing to draw objects. All calls to
* XPLMSetGraphicsState should have no fog or lighting.
*
*/
XPLM_API void XPLMSetGraphicsState(
int inEnableFog,
int inNumberTexUnits,
int inEnableLighting,
int inEnableAlphaTesting,
int inEnableAlphaBlending,
int inEnableDepthTesting,
int inEnableDepthWriting);
/*
* XPLMBindTexture2d
*
* XPLMBindTexture2d changes what texture is bound to the 2d texturing
* target. This routine caches the current 2d texture across all texturing
* units in the sim and plug-ins, preventing extraneous binding. For
* example, consider several plug-ins running in series; if they all use the
* 'general interface' bitmap to do UI, calling this function will skip the
* rebinding of the general interface texture on all but the first plug-in,
* which can provide better frame rates on some graphics cards.
*
* inTextureID is the ID of the texture object to bind; inTextureUnit is a
* zero-based texture unit (e.g. 0 for the first one), up to a maximum of 4
* units. (This number may increase in future versions of X-Plane.)
*
* Use this routine instead of glBindTexture(GL_TEXTURE_2D, ....);
*
*/
XPLM_API void XPLMBindTexture2d(
int inTextureNum,
int inTextureUnit);
/*
* XPLMGenerateTextureNumbers
*
* Use this routine instead of glGenTextures to generate new texture object
* IDs. This routine historically ensured that plugins don't use texure IDs
* that X-Plane is reserving for its own use.
*
*/
XPLM_API void XPLMGenerateTextureNumbers(
int * outTextureIDs,
int inCount);
#if defined(XPLM_DEPRECATED)
/*
* XPLMGetTexture
*
* XPLMGetTexture returns the OpenGL texture ID of an X-Plane texture based on
* a generic identifying code. For example, you can get the texture for
* X-Plane's UI bitmaps.
*
*/
XPLM_API int XPLMGetTexture(
XPLMTextureID inTexture);
#endif /* XPLM_DEPRECATED */
/*
* XPLMWorldToLocal
*
* This routine translates coordinates from latitude, longitude, and altitude
* to local scene coordinates. Latitude and longitude are in decimal degrees,
* and altitude is in meters MSL (mean sea level). The XYZ coordinates are in
* meters in the local OpenGL coordinate system.
*
*/
XPLM_API void XPLMWorldToLocal(
double inLatitude,
double inLongitude,
double inAltitude,
double * outX,
double * outY,
double * outZ);
/*
* XPLMLocalToWorld
*
* This routine translates a local coordinate triplet back into latitude,
* longitude, and altitude. Latitude and longitude are in decimal degrees,
* and altitude is in meters MSL (mean sea level). The XYZ coordinates are in
* meters in the local OpenGL coordinate system.
*
* NOTE: world coordinates are less precise than local coordinates; you should
* try to avoid round tripping from local to world and back.
*
*/
XPLM_API void XPLMLocalToWorld(
double inX,
double inY,
double inZ,
double * outLatitude,
double * outLongitude,
double * outAltitude);
/*
* XPLMDrawTranslucentDarkBox
*
* This routine draws a translucent dark box, partially obscuring parts of the
* screen but making text easy to read. This is the same graphics primitive
* used by X-Plane to show text files.
*
*/
XPLM_API void XPLMDrawTranslucentDarkBox(
int inLeft,
int inTop,
int inRight,
int inBottom);
/***************************************************************************
* X-PLANE TEXT
***************************************************************************/
/*
* XPLMFontID
*
* X-Plane features some fixed-character fonts. Each font may have its own
* metrics.
*
* WARNING: Some of these fonts are no longer supported or may have changed
* geometries. For maximum copmatibility, see the comments below.
*
* Note: X-Plane 7 supports proportional-spaced fonts. Since no measuring
* routine is available yet, the SDK will normally draw using a fixed-width
* font. You can use a dataref to enable proportional font drawing on XP7 if
* you want to.
*
*/
enum {
/* Mono-spaced font for user interface. Available in all versions of the SDK.*/
xplmFont_Basic = 0,
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_Menus = 1,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_Metal = 2,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_Led = 3,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_LedWide = 4,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_PanelHUD = 5,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_PanelEFIS = 6,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_PanelGPS = 7,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosGA = 8,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosBC = 9,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosHM = 10,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosGANarrow = 11,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosBCNarrow = 12,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_RadiosHMNarrow = 13,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_Timer = 14,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_FullRound = 15,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_SmallRound = 16,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM_DEPRECATED)
/* Deprecated, do not use. */
xplmFont_Menus_Localized = 17,
#endif /* XPLM_DEPRECATED */
#if defined(XPLM200)
/* Proportional UI font. */
xplmFont_Proportional = 18,
#endif /* XPLM200 */
};
typedef int XPLMFontID;
/*
* XPLMDrawString
*
* This routine draws a NULL terminated string in a given font. Pass in the
* lower left pixel that the character is to be drawn onto. Also pass the
* character and font ID. This function returns the x offset plus the width of
* all drawn characters. The color to draw in is specified as a pointer to an
* array of three floating point colors, representing RGB intensities from 0.0
* to 1.0.
*
*/
XPLM_API void XPLMDrawString(
float * inColorRGB,
int inXOffset,
int inYOffset,
const char * inChar,
int * inWordWrapWidth, /* Can be NULL */
XPLMFontID inFontID);
/*
* XPLMDrawNumber
*
* This routine draws a number similar to the digit editing fields in
* PlaneMaker and data output display in X-Plane. Pass in a color, a
* position, a floating point value, and formatting info. Specify how many
* integer and how many decimal digits to show and whether to show a sign, as
* well as a character set. This routine returns the xOffset plus width of the
* string drawn.
*
*/
XPLM_API void XPLMDrawNumber(
float * inColorRGB,
int inXOffset,
int inYOffset,
double inValue,
int inDigits,
int inDecimals,
int inShowSign,
XPLMFontID inFontID);
/*
* XPLMGetFontDimensions
*
* This routine returns the width and height of a character in a given font.
* It also tells you if the font only supports numeric digits. Pass NULL if
* you don't need a given field. Note that for a proportional font the width
* will be an arbitrary, hopefully average width.
*
*/
XPLM_API void XPLMGetFontDimensions(
XPLMFontID inFontID,
int * outCharWidth, /* Can be NULL */
int * outCharHeight, /* Can be NULL */
int * outDigitsOnly); /* Can be NULL */
#if defined(XPLM200)
/*
* XPLMMeasureString
*
* This routine returns the width in pixels of a string using a given font.
* The string is passed as a pointer plus length (and does not need to be null
* terminated); this is used to allow for measuring substrings. The return
* value is floating point; it is possible that future font drawing may allow
* for fractional pixels.
*
*/
XPLM_API float XPLMMeasureString(
XPLMFontID inFontID,
const char * inChar,
int inNumChars);
#endif /* XPLM200 */
#ifdef __cplusplus
}
#endif
#endif