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/*

 * Mesa 3-D graphics library

 * Version:  6.5

 *

 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included

 * in all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 */

/**

 * \file swrast/swrast.h

 * \brief Public interface to the software rasterization functions.

 * \author Keith Whitwell 

 */

#ifndef SWRAST_H

#define SWRAST_H

#include "main/mtypes.h"

/**

 * \struct SWvertex

 * \brief Data-structure to handle vertices in the software rasterizer.

 *

 * The software rasterizer now uses this format for vertices.  Thus a

 * 'RasterSetup' stage or other translation is required between the

 * tnl module and the swrast rasterization functions.  This serves to

 * isolate the swrast module from the internals of the tnl module, and

 * improve its usefulness as a fallback mechanism for hardware

 * drivers.

 *

 * wpos = attr[FRAG_ATTRIB_WPOS] and MUST BE THE FIRST values in the

 * vertex because of the tnl clipping code.

 * wpos[0] and [1] are the screen-coords of SWvertex.

 * wpos[2] is the z-buffer coord (if 16-bit Z buffer, in range [0,65535]).

 * wpos[3] is 1/w where w is the clip-space W coord.  This is the value

 * that clip{XYZ} were multiplied by to get ndc{XYZ}.

 *

 * Full software drivers:

 *   - Register the rastersetup and triangle functions from

 *     utils/software_helper.

 *   - On statechange, update the rasterization pointers in that module.

 *

 * Rasterization hardware drivers:

 *   - Keep native rastersetup.

 *   - Implement native twoside,offset and unfilled triangle setup.

 *   - Implement a translator from native vertices to swrast vertices.

 *   - On partial fallback (mix of accelerated and unaccelerated

 *   prims), call a pass-through function which translates native

 *   vertices to SWvertices and calls the appropriate swrast function.

 *   - On total fallback (vertex format insufficient for state or all

 *     primitives unaccelerated), hook in swrast_setup instead.

 */

typedef struct {

   GLfloat attrib[FRAG_ATTRIB_MAX][4];

   GLchan color[4];   /** integer color */

   GLfloat pointSize;

} SWvertex;

#define FRAG_ATTRIB_CI FRAG_ATTRIB_COL0

struct swrast_device_driver;

/* These are the public-access functions exported from swrast.

 */

extern GLboolean

_swrast_CreateContext( struct gl_context *ctx );

extern void

_swrast_DestroyContext( struct gl_context *ctx );

/* Get a (non-const) reference to the device driver struct for swrast.

 */

extern struct swrast_device_driver *

_swrast_GetDeviceDriverReference( struct gl_context *ctx );

extern void

_swrast_Bitmap( struct gl_context *ctx,

		GLint px, GLint py,

		GLsizei width, GLsizei height,

		const struct gl_pixelstore_attrib *unpack,

		const GLubyte *bitmap );

extern void

_swrast_CopyPixels( struct gl_context *ctx,

		    GLint srcx, GLint srcy,

		    GLint destx, GLint desty,

		    GLsizei width, GLsizei height,

		    GLenum type );

extern void

_swrast_DrawPixels( struct gl_context *ctx,

		    GLint x, GLint y,

		    GLsizei width, GLsizei height,

		    GLenum format, GLenum type,

		    const struct gl_pixelstore_attrib *unpack,

		    const GLvoid *pixels );

extern void

_swrast_ReadPixels( struct gl_context *ctx,

		    GLint x, GLint y, GLsizei width, GLsizei height,

		    GLenum format, GLenum type,

		    const struct gl_pixelstore_attrib *unpack,

		    GLvoid *pixels );

extern void

_swrast_BlitFramebuffer(struct gl_context *ctx,

                        GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1,

                        GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1,

                        GLbitfield mask, GLenum filter);

extern void

_swrast_Clear(struct gl_context *ctx, GLbitfield buffers);

extern void

_swrast_Accum(struct gl_context *ctx, GLenum op, GLfloat value);

/* Reset the stipple counter

 */

extern void

_swrast_ResetLineStipple( struct gl_context *ctx );

/**

 * Indicates front/back facing for subsequent points/lines when drawing

 * unfilled polygons.  Needed for two-side stencil.

 */

extern void

_swrast_SetFacing(struct gl_context *ctx, GLuint facing);

/* These will always render the correct point/line/triangle for the

 * current state.

 *

 * For flatshaded primitives, the provoking vertex is the final one.

 */

extern void

_swrast_Point( struct gl_context *ctx, const SWvertex *v );

extern void

_swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 );

extern void

_swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,

                  const SWvertex *v1, const SWvertex *v2 );

extern void

_swrast_Quad( struct gl_context *ctx,

              const SWvertex *v0, const SWvertex *v1,

	      const SWvertex *v2,  const SWvertex *v3);

extern void

_swrast_flush( struct gl_context *ctx );

extern void

_swrast_render_primitive( struct gl_context *ctx, GLenum mode );

extern void

_swrast_render_start( struct gl_context *ctx );

extern void

_swrast_render_finish( struct gl_context *ctx );

/* Tell the software rasterizer about core state changes.

 */

extern void

_swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state );

/* Configure software rasterizer to match hardware rasterizer characteristics:

 */

extern void

_swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value );

extern void

_swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value );

/* Debug:

 */

extern void

_swrast_print_vertex( struct gl_context *ctx, const SWvertex *v );

extern void

_swrast_eject_texture_images(struct gl_context *ctx);

/**

 * The driver interface for the software rasterizer.

 * XXX this may go away.

 * We may move these functions to ctx->Driver.RenderStart, RenderEnd.

 */

struct swrast_device_driver {

   /*

    * These are called before and after accessing renderbuffers during

    * software rasterization.

    *

    * These are a suitable place for grabbing/releasing hardware locks.

    *

    * NOTE: The swrast triangle/line/point routines *DO NOT* call

    * these functions.  Locking in that case must be organized by the

    * driver by other mechanisms.

    */

   void (*SpanRenderStart)(struct gl_context *ctx);

   void (*SpanRenderFinish)(struct gl_context *ctx);

};

#endif