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284 lines
8.3 KiB
C
284 lines
8.3 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Mesa Off-Screen rendering interface.
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*
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* This is an operating system and window system independent interface to
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* Mesa which allows one to render images into a client-supplied buffer in
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* main memory. Such images may manipulated or saved in whatever way the
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* client wants.
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*
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* These are the API functions:
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* OSMesaCreateContext - create a new Off-Screen Mesa rendering context
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* OSMesaMakeCurrent - bind an OSMesaContext to a client's image buffer
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* and make the specified context the current one.
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* OSMesaDestroyContext - destroy an OSMesaContext
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* OSMesaGetCurrentContext - return thread's current context ID
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* OSMesaPixelStore - controls how pixels are stored in image buffer
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* OSMesaGetIntegerv - return OSMesa state parameters
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*
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*
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* The limits on the width and height of an image buffer are MAX_WIDTH and
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* MAX_HEIGHT as defined in Mesa/src/config.h. Defaults are 1280 and 1024.
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* You can increase them as needed but beware that many temporary arrays in
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* Mesa are dimensioned by MAX_WIDTH or MAX_HEIGHT.
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*/
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#ifndef OSMESA_H
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#define OSMESA_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <GL/gl.h>
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#define OSMESA_MAJOR_VERSION 6
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#define OSMESA_MINOR_VERSION 5
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#define OSMESA_PATCH_VERSION 0
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/*
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* Values for the format parameter of OSMesaCreateContext()
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* New in version 2.0.
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*/
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#define OSMESA_COLOR_INDEX GL_COLOR_INDEX
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#define OSMESA_RGBA GL_RGBA
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#define OSMESA_BGRA 0x1
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#define OSMESA_ARGB 0x2
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#define OSMESA_RGB GL_RGB
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#define OSMESA_BGR 0x4
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#define OSMESA_RGB_565 0x5
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/*
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* OSMesaPixelStore() parameters:
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* New in version 2.0.
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*/
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#define OSMESA_ROW_LENGTH 0x10
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#define OSMESA_Y_UP 0x11
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/*
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* Accepted by OSMesaGetIntegerv:
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*/
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#define OSMESA_WIDTH 0x20
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#define OSMESA_HEIGHT 0x21
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#define OSMESA_FORMAT 0x22
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#define OSMESA_TYPE 0x23
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#define OSMESA_MAX_WIDTH 0x24 /* new in 4.0 */
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#define OSMESA_MAX_HEIGHT 0x25 /* new in 4.0 */
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typedef struct osmesa_context *OSMesaContext;
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#if defined(__QUICKDRAW__)
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#pragma export on
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#endif
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/*
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* Create an Off-Screen Mesa rendering context. The only attribute needed is
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* an RGBA vs Color-Index mode flag.
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*
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* Input: format - one of OSMESA_COLOR_INDEX, OSMESA_RGBA, OSMESA_BGRA,
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* OSMESA_ARGB, OSMESA_RGB, or OSMESA_BGR.
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* sharelist - specifies another OSMesaContext with which to share
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* display lists. NULL indicates no sharing.
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* Return: an OSMesaContext or 0 if error
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*/
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GLAPI OSMesaContext GLAPIENTRY
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OSMesaCreateContext( GLenum format, OSMesaContext sharelist );
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/*
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* Create an Off-Screen Mesa rendering context and specify desired
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* size of depth buffer, stencil buffer and accumulation buffer.
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* If you specify zero for depthBits, stencilBits, accumBits you
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* can save some memory.
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*
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* New in Mesa 3.5
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*/
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GLAPI OSMesaContext GLAPIENTRY
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OSMesaCreateContextExt( GLenum format, GLint depthBits, GLint stencilBits,
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GLint accumBits, OSMesaContext sharelist);
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/*
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* Destroy an Off-Screen Mesa rendering context.
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*
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* Input: ctx - the context to destroy
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*/
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GLAPI void GLAPIENTRY
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OSMesaDestroyContext( OSMesaContext ctx );
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/*
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* Bind an OSMesaContext to an image buffer. The image buffer is just a
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* block of memory which the client provides. Its size must be at least
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* as large as width*height*sizeof(type). Its address should be a multiple
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* of 4 if using RGBA mode.
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*
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* Image data is stored in the order of glDrawPixels: row-major order
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* with the lower-left image pixel stored in the first array position
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* (ie. bottom-to-top).
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*
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* Since the only type initially supported is GL_UNSIGNED_BYTE, if the
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* context is in RGBA mode, each pixel will be stored as a 4-byte RGBA
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* value. If the context is in color indexed mode, each pixel will be
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* stored as a 1-byte value.
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*
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* If the context's viewport hasn't been initialized yet, it will now be
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* initialized to (0,0,width,height).
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*
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* Input: ctx - the rendering context
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* buffer - the image buffer memory
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* type - data type for pixel components, only GL_UNSIGNED_BYTE
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* supported now
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* width, height - size of image buffer in pixels, at least 1
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* Return: GL_TRUE if success, GL_FALSE if error because of invalid ctx,
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* invalid buffer address, type!=GL_UNSIGNED_BYTE, width<1, height<1,
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* width>internal limit or height>internal limit.
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*/
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GLAPI GLboolean GLAPIENTRY
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OSMesaMakeCurrent( OSMesaContext ctx, void *buffer, GLenum type,
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GLsizei width, GLsizei height );
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/*
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* Return the current Off-Screen Mesa rendering context handle.
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*/
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GLAPI OSMesaContext GLAPIENTRY
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OSMesaGetCurrentContext( void );
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/*
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* Set pixel store/packing parameters for the current context.
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* This is similar to glPixelStore.
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* Input: pname - OSMESA_ROW_LENGTH
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* specify actual pixels per row in image buffer
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* 0 = same as image width (default)
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* OSMESA_Y_UP
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* zero = Y coordinates increase downward
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* non-zero = Y coordinates increase upward (default)
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* value - the value for the parameter pname
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*
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* New in version 2.0.
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*/
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GLAPI void GLAPIENTRY
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OSMesaPixelStore( GLint pname, GLint value );
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/*
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* Return an integer value like glGetIntegerv.
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* Input: pname -
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* OSMESA_WIDTH return current image width
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* OSMESA_HEIGHT return current image height
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* OSMESA_FORMAT return image format
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* OSMESA_TYPE return color component data type
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* OSMESA_ROW_LENGTH return row length in pixels
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* OSMESA_Y_UP returns 1 or 0 to indicate Y axis direction
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* value - pointer to integer in which to return result.
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*/
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GLAPI void GLAPIENTRY
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OSMesaGetIntegerv( GLint pname, GLint *value );
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/*
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* Return the depth buffer associated with an OSMesa context.
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* Input: c - the OSMesa context
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* Output: width, height - size of buffer in pixels
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* bytesPerValue - bytes per depth value (2 or 4)
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* buffer - pointer to depth buffer values
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* Return: GL_TRUE or GL_FALSE to indicate success or failure.
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*
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* New in Mesa 2.4.
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*/
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GLAPI GLboolean GLAPIENTRY
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OSMesaGetDepthBuffer( OSMesaContext c, GLint *width, GLint *height,
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GLint *bytesPerValue, void **buffer );
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/*
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* Return the color buffer associated with an OSMesa context.
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* Input: c - the OSMesa context
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* Output: width, height - size of buffer in pixels
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* format - buffer format (OSMESA_FORMAT)
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* buffer - pointer to depth buffer values
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* Return: GL_TRUE or GL_FALSE to indicate success or failure.
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*
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* New in Mesa 3.3.
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*/
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GLAPI GLboolean GLAPIENTRY
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OSMesaGetColorBuffer( OSMesaContext c, GLint *width, GLint *height,
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GLint *format, void **buffer );
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/**
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* This typedef is new in Mesa 6.3.
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*/
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typedef void (*OSMESAproc)();
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/*
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* Return pointer to the named function.
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* New in Mesa 4.1
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* Return OSMESAproc in 6.3.
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*/
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GLAPI OSMESAproc GLAPIENTRY
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OSMesaGetProcAddress( const char *funcName );
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/**
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* Enable/disable color clamping, off by default.
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* New in Mesa 6.4.2
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*/
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GLAPI void GLAPIENTRY
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OSMesaColorClamp(GLboolean enable);
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#ifdef __cplusplus
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}
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#endif
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#endif
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