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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  27.  
  28. /**
  29.  * glRasterPos implementation.  Basically render a GL_POINT with our
  30.  * private draw module.  Plug in a special "rasterpos" stage at the end
  31.  * of the 'draw' pipeline to capture the results and update the current
  32.  * raster pos attributes.
  33.  *
  34.  * Authors:
  35.  *   Brian Paul
  36.  */
  37.  
  38.  
  39. #include "main/imports.h"
  40. #include "main/macros.h"
  41. #include "main/feedback.h"
  42.  
  43. #include "st_context.h"
  44. #include "st_atom.h"
  45. #include "st_draw.h"
  46. #include "st_cb_rasterpos.h"
  47. #include "draw/draw_context.h"
  48. #include "draw/draw_pipe.h"
  49. #include "vbo/vbo.h"
  50.  
  51.  
  52. /**
  53.  * Our special drawing pipeline stage (replaces rasterization).
  54.  */
  55. struct rastpos_stage
  56. {
  57.    struct draw_stage stage;   /**< Base class */
  58.    struct gl_context *ctx;            /**< Rendering context */
  59.  
  60.    /* vertex attrib info we can setup once and re-use */
  61.    struct gl_client_array array[VERT_ATTRIB_MAX];
  62.    const struct gl_client_array *arrays[VERT_ATTRIB_MAX];
  63.    struct _mesa_prim prim;
  64. };
  65.  
  66.  
  67. static INLINE struct rastpos_stage *
  68. rastpos_stage( struct draw_stage *stage )
  69. {
  70.    return (struct rastpos_stage *) stage;
  71. }
  72.  
  73. static void
  74. rastpos_flush( struct draw_stage *stage, unsigned flags )
  75. {
  76.    /* no-op */
  77. }
  78.  
  79. static void
  80. rastpos_reset_stipple_counter( struct draw_stage *stage )
  81. {
  82.    /* no-op */
  83. }
  84.  
  85. static void
  86. rastpos_tri( struct draw_stage *stage, struct prim_header *prim )
  87. {
  88.    /* should never get here */
  89.    assert(0);
  90. }
  91.  
  92. static void
  93. rastpos_line( struct draw_stage *stage, struct prim_header *prim )
  94. {
  95.    /* should never get here */
  96.    assert(0);
  97. }
  98.  
  99. static void
  100. rastpos_destroy(struct draw_stage *stage)
  101. {
  102.    free(stage);
  103. }
  104.  
  105.  
  106. /**
  107.  * Update a raster pos attribute from the vertex result if it's present,
  108.  * else copy the current attrib.
  109.  */
  110. static void
  111. update_attrib(struct gl_context *ctx, const GLuint *outputMapping,
  112.               const struct vertex_header *vert,
  113.               GLfloat *dest,
  114.               GLuint result, GLuint defaultAttrib)
  115. {
  116.    const GLfloat *src;
  117.    const GLuint k = outputMapping[result];
  118.    if (k != ~0U)
  119.       src = vert->data[k];
  120.    else
  121.       src = ctx->Current.Attrib[defaultAttrib];
  122.    COPY_4V(dest, src);
  123. }
  124.  
  125.  
  126. /**
  127.  * Normally, this function would render a GL_POINT.
  128.  */
  129. static void
  130. rastpos_point(struct draw_stage *stage, struct prim_header *prim)
  131. {
  132.    struct rastpos_stage *rs = rastpos_stage(stage);
  133.    struct gl_context *ctx = rs->ctx;
  134.    struct st_context *st = st_context(ctx);
  135.    const GLfloat height = (GLfloat) ctx->DrawBuffer->Height;
  136.    const GLuint *outputMapping = st->vertex_result_to_slot;
  137.    const GLfloat *pos;
  138.    GLuint i;
  139.  
  140.    /* if we get here, we didn't get clipped */
  141.    ctx->Current.RasterPosValid = GL_TRUE;
  142.  
  143.    /* update raster pos */
  144.    pos = prim->v[0]->data[0];
  145.    ctx->Current.RasterPos[0] = pos[0];
  146.    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)
  147.       ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */
  148.    else
  149.       ctx->Current.RasterPos[1] = pos[1];
  150.    ctx->Current.RasterPos[2] = pos[2];
  151.    ctx->Current.RasterPos[3] = pos[3];
  152.  
  153.    /* update other raster attribs */
  154.    update_attrib(ctx, outputMapping, prim->v[0],
  155.                  ctx->Current.RasterColor,
  156.                  VARYING_SLOT_COL0, VERT_ATTRIB_COLOR0);
  157.  
  158.    update_attrib(ctx, outputMapping, prim->v[0],
  159.                  ctx->Current.RasterSecondaryColor,
  160.                  VARYING_SLOT_COL1, VERT_ATTRIB_COLOR1);
  161.  
  162.    for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
  163.       update_attrib(ctx, outputMapping, prim->v[0],
  164.                     ctx->Current.RasterTexCoords[i],
  165.                     VARYING_SLOT_TEX0 + i, VERT_ATTRIB_TEX0 + i);
  166.    }
  167.  
  168.    if (ctx->RenderMode == GL_SELECT) {
  169.       _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
  170.    }
  171. }
  172.  
  173.  
  174. /**
  175.  * Create rasterpos "drawing" stage.
  176.  */
  177. static struct rastpos_stage *
  178. new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw)
  179. {
  180.    struct rastpos_stage *rs = ST_CALLOC_STRUCT(rastpos_stage);
  181.    GLuint i;
  182.  
  183.    rs->stage.draw = draw;
  184.    rs->stage.next = NULL;
  185.    rs->stage.point = rastpos_point;
  186.    rs->stage.line = rastpos_line;
  187.    rs->stage.tri = rastpos_tri;
  188.    rs->stage.flush = rastpos_flush;
  189.    rs->stage.destroy = rastpos_destroy;
  190.    rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter;
  191.    rs->stage.destroy = rastpos_destroy;
  192.    rs->ctx = ctx;
  193.  
  194.    for (i = 0; i < Elements(rs->array); i++) {
  195.       rs->array[i].Size = 4;
  196.       rs->array[i].Type = GL_FLOAT;
  197.       rs->array[i].Format = GL_RGBA;
  198.       rs->array[i].Stride = 0;
  199.       rs->array[i].StrideB = 0;
  200.       rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i];
  201.       rs->array[i].Enabled = GL_TRUE;
  202.       rs->array[i].Normalized = GL_TRUE;
  203.       rs->array[i].BufferObj = NULL;
  204.       rs->arrays[i] = &rs->array[i];
  205.    }
  206.  
  207.    rs->prim.mode = GL_POINTS;
  208.    rs->prim.indexed = 0;
  209.    rs->prim.begin = 1;
  210.    rs->prim.end = 1;
  211.    rs->prim.weak = 0;
  212.    rs->prim.start = 0;
  213.    rs->prim.count = 1;
  214.  
  215.    return rs;
  216. }
  217.  
  218.  
  219. static void
  220. st_RasterPos(struct gl_context *ctx, const GLfloat v[4])
  221. {
  222.    struct st_context *st = st_context(ctx);
  223.    struct draw_context *draw = st->draw;
  224.    struct rastpos_stage *rs;
  225.    const struct gl_client_array **saved_arrays = ctx->Array._DrawArrays;
  226.  
  227.    if (st->rastpos_stage) {
  228.       /* get rastpos stage info */
  229.       rs = rastpos_stage(st->rastpos_stage);
  230.    }
  231.    else {
  232.       /* create rastpos draw stage */
  233.       rs = new_draw_rastpos_stage(ctx, draw);
  234.       st->rastpos_stage = &rs->stage;
  235.    }
  236.  
  237.    /* plug our rastpos stage into the draw module */
  238.    draw_set_rasterize_stage(st->draw, st->rastpos_stage);
  239.  
  240.    /* make sure everything's up to date */
  241.    st_validate_state(st);
  242.  
  243.    /* This will get set only if rastpos_point(), above, gets called */
  244.    ctx->Current.RasterPosValid = GL_FALSE;
  245.  
  246.    /* All vertex attribs but position were previously initialized above.
  247.     * Just plug in position pointer now.
  248.     */
  249.    rs->array[0].Ptr = (GLubyte *) v;
  250.  
  251.    /* Draw the point.
  252.     *
  253.     * Don't set DriverFlags.NewArray.
  254.     * st_feedback_draw_vbo doesn't check for that flag. */
  255.    ctx->Array._DrawArrays = rs->arrays;
  256.    st_feedback_draw_vbo(ctx, &rs->prim, 1, NULL, GL_TRUE, 0, 1,
  257.                         NULL);
  258.    ctx->Array._DrawArrays = saved_arrays;
  259.  
  260.    /* restore draw's rasterization stage depending on rendermode */
  261.    if (ctx->RenderMode == GL_FEEDBACK) {
  262.       draw_set_rasterize_stage(draw, st->feedback_stage);
  263.    }
  264.    else if (ctx->RenderMode == GL_SELECT) {
  265.       draw_set_rasterize_stage(draw, st->selection_stage);
  266.    }
  267. }
  268.  
  269.  
  270.  
  271. void st_init_rasterpos_functions(struct dd_function_table *functions)
  272. {
  273.    functions->RasterPos = st_RasterPos;
  274. }
  275.