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updated some comments/docs
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Brian Paul
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@ -1,4 +1,4 @@
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/* $Id: dd.h,v 1.3 1999/09/30 11:18:21 keithw Exp $ */
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/* $Id: dd.h,v 1.4 1999/10/21 12:46:27 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -63,10 +63,10 @@ struct gl_pipeline_stage;
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* The optional functions provide ways to take advantage of special hardware
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* or optimized algorithms.
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*
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* The function pointers in the dd_function_table struct are first
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* initialized in the "MakeCurrent" function. The "MakeCurrent" function
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* is a little different in each device driver. See the X/Mesa, GLX, or
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* OS/Mesa drivers for examples.
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* The function pointers in the dd_function_table struct should first be
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* initialized in the driver's "MakeCurrent" function. The "MakeCurrent"
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* function is a little different in each device driver. See the X/Mesa,
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* GLX, or OS/Mesa drivers for examples.
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*
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* Later, Mesa may call the dd_function_table's UpdateState() function.
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* This function should initialize the dd_function_table's pointers again.
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@ -81,7 +81,8 @@ struct gl_pipeline_stage;
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* for an example.
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*
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* For more information about writing a device driver see the ddsample.c
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* file and other device drivers (xmesa[123].c, osmesa.c, etc) for examples.
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* file and other device drivers (X/xmesa[1234].c, OSMesa/osmesa.c, etc)
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* for examples.
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*
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*
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* Look below in the dd_function_table struct definition for descriptions
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@ -132,8 +133,8 @@ struct dd_function_table {
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const char * (*RendererString)(void);
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/*
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* Return a string which uniquely identifies this device driver.
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* The string should contain no whitespace. Examples: "X11" "OffScreen"
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* "MSWindows" "SVGA".
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* The string should contain no whitespace. Examples: "X11", "OffScreen",
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* "MSWindows", "SVGA".
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* NOTE: This function will be obsolete in favor of GetString in the future!
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*/
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@ -147,14 +148,14 @@ struct dd_function_table {
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void (*ClearIndex)( GLcontext *ctx, GLuint index );
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/*
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* Called whenever glClearIndex() is called. Set the index for clearing
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* the color buffer.
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* the color buffer when in color index mode.
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*/
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void (*ClearColor)( GLcontext *ctx, GLubyte red, GLubyte green,
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GLubyte blue, GLubyte alpha );
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/*
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* Called whenever glClearColor() is called. Set the color for clearing
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* the color buffer.
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* the color buffer when in RGBA mode.
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*/
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GLbitfield (*Clear)( GLcontext *ctx, GLbitfield mask, GLboolean all,
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@ -169,12 +170,14 @@ struct dd_function_table {
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void (*Index)( GLcontext *ctx, GLuint index );
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/*
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* Sets current color index for drawing flat-shaded primitives.
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* This index should also be used in the "mono" drawing functions.
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*/
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void (*Color)( GLcontext *ctx,
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GLubyte red, GLubyte green, GLubyte glue, GLubyte alpha );
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/*
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* Sets current color for drawing flat-shaded primitives.
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* This color should also be used in the "mono" drawing functions.
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*/
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GLboolean (*SetBuffer)( GLcontext *ctx, GLenum buffer );
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@ -197,8 +200,7 @@ struct dd_function_table {
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* GL_NONE - disable buffer write in device driver.
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*/
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void (*GetBufferSize)( GLcontext *ctx,
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GLuint *width, GLuint *height );
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void (*GetBufferSize)( GLcontext *ctx, GLuint *width, GLuint *height );
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/*
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* Returns the width and height of the current color buffer.
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*/
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@ -216,11 +218,14 @@ struct dd_function_table {
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CONST GLubyte rgb[][3], const GLubyte mask[] );
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/* Write a horizontal run of RGB[A] pixels. The later version is only
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* used to accelerate GL_RGB, GL_UNSIGNED_BYTE glDrawPixels() calls.
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* If mask is NULL, draw all pixels.
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* If mask is not null, only draw pixel [i] when mask [i] is true.
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*/
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void (*WriteMonoRGBASpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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const GLubyte mask[] );
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/* Write a horizontal run of mono-RGBA pixels.
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/* Write a horizontal run of RGBA pixels all with the color last
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* specified by the Color function.
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*/
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void (*WriteRGBAPixels)( const GLcontext *ctx,
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@ -239,12 +244,15 @@ struct dd_function_table {
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const GLuint index[], const GLubyte mask[] );
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void (*WriteCI8Span)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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const GLubyte index[], const GLubyte mask[] );
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/* Write a horizontal run of CI pixels. 32 or 8bpp.
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/* Write a horizontal run of CI pixels. One function is for 32bpp
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* indexes and the other for 8bpp pixels (the common case). You mus
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* implement both for color index mode.
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*/
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void (*WriteMonoCISpan)( const GLcontext *ctx, GLuint n, GLint x, GLint y,
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const GLubyte mask[] );
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/* Write a horizontal run of mono-CI pixels.
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/* Write a horizontal run of color index pixels using the color index
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* last specified by the Index() function.
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*/
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void (*WriteCI32Pixels)( const GLcontext *ctx,
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@ -257,8 +265,8 @@ struct dd_function_table {
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void (*WriteMonoCIPixels)( const GLcontext *ctx,
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GLuint n, const GLint x[], const GLint y[],
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const GLubyte mask[] );
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/*
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* Write a random array of mono-CI pixels.
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/* Write a random array of color index pixels using the color index
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* last specified by the Index() function.
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*/
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@ -310,12 +318,12 @@ struct dd_function_table {
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void (*Finish)( GLcontext *ctx );
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/*
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* Called whenever glFinish() is called.
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* This is called whenever glFinish() is called.
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*/
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void (*Flush)( GLcontext *ctx );
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/*
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* Called whenever glFlush() is called.
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* This is called whenever glFlush() is called.
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*/
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GLboolean (*IndexMask)( GLcontext *ctx, GLuint mask );
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@ -418,16 +426,17 @@ struct dd_function_table {
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GLenum format, GLenum type,
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const struct gl_pixelstore_attrib *unpack,
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const GLvoid *pixels );
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/* Device driver hook for optimized glDrawPixels. 'unpack' describes how
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* to unpack the source image data.
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/* This is called by glDrawPixels.
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* 'unpack' describes how to unpack the source image data.
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* Return GL_TRUE if the driver succeeds, return GL_FALSE if core Mesa
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* must do the job.
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*/
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GLboolean (*Bitmap)( GLcontext *ctx,
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GLint x, GLint y, GLsizei width, GLsizei height,
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const struct gl_pixelstore_attrib *unpack,
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const GLubyte *bitmap );
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/* Device driver hook for optimized glBitmap. 'unpack' describes how
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* to unpack the source image data.
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/* This is called by glBitmap. Works the same as DrawPixels, above.
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*/
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void (*RenderStart)( GLcontext *ctx );
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