src/gallium/drivers/svga/svga_pipe_rasterizer.c - platform/external/mesa3d - Git at Google

 /**********************************************************
  * Copyright 2008-2009 VMware, Inc.  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 THE AUTHORS OR COPYRIGHT HOLDERS
  * 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.
  *
  **********************************************************/

 #include "draw/draw_context.h"
 #include "util/u_inlines.h"
 #include "pipe/p_defines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"

 #include "svga_context.h"

 #include "svga_hw_reg.h"

 /* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
  */
 static SVGA3dFace svga_translate_cullmode( unsigned mode,
                                            unsigned front_ccw )
 {
    const int hw_front_ccw = 0;  /* hardware is always CW */
    switch (mode) {
    case PIPE_FACE_NONE:
       return SVGA3D_FACE_NONE;
    case PIPE_FACE_FRONT:
       return front_ccw == hw_front_ccw ? SVGA3D_FACE_FRONT : SVGA3D_FACE_BACK;
    case PIPE_FACE_BACK:
       return front_ccw == hw_front_ccw ? SVGA3D_FACE_BACK : SVGA3D_FACE_FRONT;
    case PIPE_FACE_FRONT_AND_BACK:
       return SVGA3D_FACE_FRONT_BACK;
    default:
       assert(0);
       return SVGA3D_FACE_NONE;
    }
 }

 static SVGA3dShadeMode svga_translate_flatshade( unsigned mode )
 {
    return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
 }


 static void *
 svga_create_rasterizer_state(struct pipe_context *pipe,
                              const struct pipe_rasterizer_state *templ)
 {
    struct svga_context *svga = svga_context(pipe);
    struct svga_rasterizer_state *rast = CALLOC_STRUCT( svga_rasterizer_state );

    /* need this for draw module. */
    rast->templ = *templ;

    /* light_twoside          - XXX: need fragment shader variant */
    /* poly_smooth            - XXX: no fallback available */
    /* poly_stipple_enable    - draw module */
    /* sprite_coord_enable    - ? */
    /* point_quad_rasterization - ? */
    /* point_size_per_vertex  - ? */
    /* sprite_coord_mode      - ??? */
    /* flatshade_first        - handled by index translation */
    /* gl_rasterization_rules - XXX - viewport code */
    /* line_width             - draw module */
    /* fill_cw, fill_ccw      - draw module or index translation */

    rast->shademode = svga_translate_flatshade( templ->flatshade );
    rast->cullmode = svga_translate_cullmode( templ->cull_face,
                                              templ->front_ccw );
    rast->scissortestenable = templ->scissor;
    rast->multisampleantialias = templ->multisample;
    rast->antialiasedlineenable = templ->line_smooth;
    rast->lastpixel = templ->line_last_pixel;
    rast->pointsprite = templ->sprite_coord_enable != 0x0;
    rast->pointsize = templ->point_size;
    rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;

    /* Use swtnl + decomposition implement these:
     */
    if (templ->poly_stipple_enable) {
       rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
       rast->need_pipeline_tris_str = "poly stipple";
    }

    if (templ->line_width >= 1.5f &&
        !svga->debug.no_line_width) {
       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
       rast->need_pipeline_lines_str = "line width";
    }

    if (templ->line_stipple_enable) {
       /* XXX: LinePattern not implemented on all backends, and there is no
        * mechanism to query it.
        */
       if (!svga->debug.force_hw_line_stipple) {
          SVGA3dLinePattern lp;
          lp.repeat = templ->line_stipple_factor + 1;
          lp.pattern = templ->line_stipple_pattern;
          rast->linepattern = lp.uintValue;
       }
       else {
          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
          rast->need_pipeline_lines_str = "line stipple";
       }
    }

    if (templ->point_smooth) {
       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
       rast->need_pipeline_points_str = "smooth points";
    }

    if (templ->line_smooth) {
       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
       rast->need_pipeline_lines_str = "smooth lines";
    }

    {
       int fill_front = templ->fill_front;
       int fill_back = templ->fill_back;
       int fill = PIPE_POLYGON_MODE_FILL;
       boolean offset_front = util_get_offset(templ, fill_front);
       boolean offset_back = util_get_offset(templ, fill_back);
       boolean offset  = 0;

       switch (templ->cull_face) {
       case PIPE_FACE_FRONT_AND_BACK:
          offset = 0;
          fill = PIPE_POLYGON_MODE_FILL;
          break;

       case PIPE_FACE_FRONT:
          offset = offset_front;
          fill = fill_front;
          break;

       case PIPE_FACE_BACK:
          offset = offset_back;
          fill = fill_back;
          break;

       case PIPE_FACE_NONE:
          if (fill_front != fill_back || offset_front != offset_back)
          {
             /* Always need the draw module to work out different
              * front/back fill modes:
              */
             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
             rast->need_pipeline_tris_str = "different front/back fillmodes";
          }
          else {
             offset = offset_front;
             fill = fill_front;
          }
          break;

       default:
          assert(0);
          break;
       }

       /* Unfilled primitive modes aren't implemented on all virtual
        * hardware.  We can do some unfilled processing with index
        * translation, but otherwise need the draw module:
        */
       if (fill != PIPE_POLYGON_MODE_FILL &&
           (templ->flatshade ||
            templ->light_twoside ||
            offset ||
            templ->cull_face != PIPE_FACE_NONE))
       {
          fill = PIPE_POLYGON_MODE_FILL;
          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
       }

       /* If we are decomposing to lines, and lines need the pipeline,
        * then we also need the pipeline for tris.
        */
       if (fill == PIPE_POLYGON_MODE_LINE &&
           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
       {
          fill = PIPE_POLYGON_MODE_FILL;
          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
          rast->need_pipeline_tris_str = "decomposing lines";
       }

       /* Similarly for points:
        */
       if (fill == PIPE_POLYGON_MODE_POINT &&
           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
       {
          fill = PIPE_POLYGON_MODE_FILL;
          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
          rast->need_pipeline_tris_str = "decomposing points";
       }

       if (offset) {
          rast->slopescaledepthbias = templ->offset_scale;
          rast->depthbias = templ->offset_units;
       }

       rast->hw_unfilled = fill;
    }

    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
       /* Turn off stuff which will get done in the draw module:
        */
       rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
       rast->slopescaledepthbias = 0;
       rast->depthbias = 0;
    }

    return rast;
 }

 static void svga_bind_rasterizer_state( struct pipe_context *pipe,
                                         void *state )
 {
    struct svga_context *svga = svga_context(pipe);
    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;


    draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL,
                              state);
    svga->curr.rast = raster;

    svga->dirty |= SVGA_NEW_RAST;
 }

 static void svga_delete_rasterizer_state(struct pipe_context *pipe,
                                          void *raster)
 {
    FREE(raster);
 }


 void svga_init_rasterizer_functions( struct svga_context *svga )
 {
    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 }


 /***********************************************************************
  * Hardware state update
  */
	/**********************************************************
	* Copyright 2008-2009 VMware, Inc. 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 THE AUTHORS OR COPYRIGHT HOLDERS
	* 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.
	*
	**********************************************************/

	#include "draw/draw_context.h"
	#include "util/u_inlines.h"
	#include "pipe/p_defines.h"
	#include "util/u_math.h"
	#include "util/u_memory.h"

	#include "svga_context.h"

	#include "svga_hw_reg.h"

	/* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
	*/
	static SVGA3dFace svga_translate_cullmode( unsigned mode,
	unsigned front_ccw )
	{
	const int hw_front_ccw = 0; /* hardware is always CW */
	switch (mode) {
	case PIPE_FACE_NONE:
	return SVGA3D_FACE_NONE;
	case PIPE_FACE_FRONT:
	return front_ccw == hw_front_ccw ? SVGA3D_FACE_FRONT : SVGA3D_FACE_BACK;
	case PIPE_FACE_BACK:
	return front_ccw == hw_front_ccw ? SVGA3D_FACE_BACK : SVGA3D_FACE_FRONT;
	case PIPE_FACE_FRONT_AND_BACK:
	return SVGA3D_FACE_FRONT_BACK;
	default:
	assert(0);
	return SVGA3D_FACE_NONE;
	}
	}

	static SVGA3dShadeMode svga_translate_flatshade( unsigned mode )
	{
	return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
	}


	static void *
	svga_create_rasterizer_state(struct pipe_context *pipe,
	const struct pipe_rasterizer_state *templ)
	{
	struct svga_context *svga = svga_context(pipe);
	struct svga_rasterizer_state *rast = CALLOC_STRUCT( svga_rasterizer_state );

	/* need this for draw module. */
	rast->templ = *templ;

	/* light_twoside - XXX: need fragment shader variant */
	/* poly_smooth - XXX: no fallback available */
	/* poly_stipple_enable - draw module */
	/* sprite_coord_enable - ? */
	/* point_quad_rasterization - ? */
	/* point_size_per_vertex - ? */
	/* sprite_coord_mode - ??? */
	/* flatshade_first - handled by index translation */
	/* gl_rasterization_rules - XXX - viewport code */
	/* line_width - draw module */
	/* fill_cw, fill_ccw - draw module or index translation */

	rast->shademode = svga_translate_flatshade( templ->flatshade );
	rast->cullmode = svga_translate_cullmode( templ->cull_face,
	templ->front_ccw );
	rast->scissortestenable = templ->scissor;
	rast->multisampleantialias = templ->multisample;
	rast->antialiasedlineenable = templ->line_smooth;
	rast->lastpixel = templ->line_last_pixel;
	rast->pointsprite = templ->sprite_coord_enable != 0x0;
	rast->pointsize = templ->point_size;
	rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;

	/* Use swtnl + decomposition implement these:
	*/
	if (templ->poly_stipple_enable) {
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_TRIS;
	rast->need_pipeline_tris_str = "poly stipple";
	}

	if (templ->line_width >= 1.5f &&
	!svga->debug.no_line_width) {
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_LINES;
	rast->need_pipeline_lines_str = "line width";
	}

	if (templ->line_stipple_enable) {
	/* XXX: LinePattern not implemented on all backends, and there is no
	* mechanism to query it.
	*/
	if (!svga->debug.force_hw_line_stipple) {
	SVGA3dLinePattern lp;
	lp.repeat = templ->line_stipple_factor + 1;
	lp.pattern = templ->line_stipple_pattern;
	rast->linepattern = lp.uintValue;
	}
	else {
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_LINES;
	rast->need_pipeline_lines_str = "line stipple";
	}
	}

	if (templ->point_smooth) {
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_POINTS;
	rast->need_pipeline_points_str = "smooth points";
	}

	if (templ->line_smooth) {
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_LINES;
	rast->need_pipeline_lines_str = "smooth lines";
	}

	{
	int fill_front = templ->fill_front;
	int fill_back = templ->fill_back;
	int fill = PIPE_POLYGON_MODE_FILL;
	boolean offset_front = util_get_offset(templ, fill_front);
	boolean offset_back = util_get_offset(templ, fill_back);
	boolean offset = 0;

	switch (templ->cull_face) {
	case PIPE_FACE_FRONT_AND_BACK:
	offset = 0;
	fill = PIPE_POLYGON_MODE_FILL;
	break;

	case PIPE_FACE_FRONT:
	offset = offset_front;
	fill = fill_front;
	break;

	case PIPE_FACE_BACK:
	offset = offset_back;
	fill = fill_back;
	break;

	case PIPE_FACE_NONE:
	if (fill_front != fill_back \|\| offset_front != offset_back)
	{
	/* Always need the draw module to work out different
	* front/back fill modes:
	*/
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_TRIS;
	rast->need_pipeline_tris_str = "different front/back fillmodes";
	}
	else {
	offset = offset_front;
	fill = fill_front;
	}
	break;

	default:
	assert(0);
	break;
	}

	/* Unfilled primitive modes aren't implemented on all virtual
	* hardware. We can do some unfilled processing with index
	* translation, but otherwise need the draw module:
	*/
	if (fill != PIPE_POLYGON_MODE_FILL &&
	(templ->flatshade \|\|
	templ->light_twoside \|\|
	offset \|\|
	templ->cull_face != PIPE_FACE_NONE))
	{
	fill = PIPE_POLYGON_MODE_FILL;
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_TRIS;
	rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
	}

	/* If we are decomposing to lines, and lines need the pipeline,
	* then we also need the pipeline for tris.
	*/
	if (fill == PIPE_POLYGON_MODE_LINE &&
	(rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
	{
	fill = PIPE_POLYGON_MODE_FILL;
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_TRIS;
	rast->need_pipeline_tris_str = "decomposing lines";
	}

	/* Similarly for points:
	*/
	if (fill == PIPE_POLYGON_MODE_POINT &&
	(rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
	{
	fill = PIPE_POLYGON_MODE_FILL;
	rast->need_pipeline \|= SVGA_PIPELINE_FLAG_TRIS;
	rast->need_pipeline_tris_str = "decomposing points";
	}

	if (offset) {
	rast->slopescaledepthbias = templ->offset_scale;
	rast->depthbias = templ->offset_units;
	}

	rast->hw_unfilled = fill;
	}

	if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
	/* Turn off stuff which will get done in the draw module:
	*/
	rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
	rast->slopescaledepthbias = 0;
	rast->depthbias = 0;
	}

	return rast;
	}

	static void svga_bind_rasterizer_state( struct pipe_context *pipe,
	void *state )
	{
	struct svga_context *svga = svga_context(pipe);
	struct svga_rasterizer_state raster = (struct svga_rasterizer_state )state;


	draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL,
	state);
	svga->curr.rast = raster;

	svga->dirty \|= SVGA_NEW_RAST;
	}

	static void svga_delete_rasterizer_state(struct pipe_context *pipe,
	void *raster)
	{
	FREE(raster);
	}


	void svga_init_rasterizer_functions( struct svga_context *svga )
	{
	svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
	svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
	svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
	}


	/***********************************************************************
	* Hardware state update
	*/