Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | Download | RSS feed

  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. #if FEATURE_rastpos
  53.  
  54. /**
  55.  * Our special drawing pipeline stage (replaces rasterization).
  56.  */
  57. struct rastpos_stage
  58. {
  59.    struct draw_stage stage;   /**< Base class */
  60.    struct gl_context *ctx;            /**< Rendering context */
  61.  
  62.    /* vertex attrib info we can setup once and re-use */
  63.    struct gl_client_array array[VERT_ATTRIB_MAX];
  64.    const struct gl_client_array *arrays[VERT_ATTRIB_MAX];
  65.    struct _mesa_prim prim;
  66. };
  67.  
  68.  
  69. static INLINE struct rastpos_stage *
  70. rastpos_stage( struct draw_stage *stage )
  71. {
  72.    return (struct rastpos_stage *) stage;
  73. }
  74.  
  75. static void
  76. rastpos_flush( struct draw_stage *stage, unsigned flags )
  77. {
  78.    /* no-op */
  79. }
  80.  
  81. static void
  82. rastpos_reset_stipple_counter( struct draw_stage *stage )
  83. {
  84.    /* no-op */
  85. }
  86.  
  87. static void
  88. rastpos_tri( struct draw_stage *stage, struct prim_header *prim )
  89. {
  90.    /* should never get here */
  91.    assert(0);
  92. }
  93.  
  94. static void
  95. rastpos_line( struct draw_stage *stage, struct prim_header *prim )
  96. {
  97.    /* should never get here */
  98.    assert(0);
  99. }
  100.  
  101. static void
  102. rastpos_destroy(struct draw_stage *stage)
  103. {
  104.    free(stage);
  105. }
  106.  
  107.  
  108. /**
  109.  * Update a raster pos attribute from the vertex result if it's present,
  110.  * else copy the current attrib.
  111.  */
  112. static void
  113. update_attrib(struct gl_context *ctx, const GLuint *outputMapping,
  114.               const struct vertex_header *vert,
  115.               GLfloat *dest,
  116.               GLuint result, GLuint defaultAttrib)
  117. {
  118.    const GLfloat *src;
  119.    const GLuint k = outputMapping[result];
  120.    if (k != ~0U)
  121.       src = vert->data[k];
  122.    else
  123.       src = ctx->Current.Attrib[defaultAttrib];
  124.    COPY_4V(dest, src);
  125. }
  126.  
  127.  
  128. /**
  129.  * Normally, this function would render a GL_POINT.
  130.  */
  131. static void
  132. rastpos_point(struct draw_stage *stage, struct prim_header *prim)
  133. {
  134.    struct rastpos_stage *rs = rastpos_stage(stage);
  135.    struct gl_context *ctx = rs->ctx;
  136.    struct st_context *st = st_context(ctx);
  137.    const GLfloat height = (GLfloat) ctx->DrawBuffer->Height;
  138.    const GLuint *outputMapping = st->vertex_result_to_slot;
  139.    const GLfloat *pos;
  140.    GLuint i;
  141.  
  142.    /* if we get here, we didn't get clipped */
  143.    ctx->Current.RasterPosValid = GL_TRUE;
  144.  
  145.    /* update raster pos */
  146.    pos = prim->v[0]->data[0];
  147.    ctx->Current.RasterPos[0] = pos[0];
  148.    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)
  149.       ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */
  150.    else
  151.       ctx->Current.RasterPos[1] = pos[1];
  152.    ctx->Current.RasterPos[2] = pos[2];
  153.    ctx->Current.RasterPos[3] = pos[3];
  154.  
  155.    /* update other raster attribs */
  156.    update_attrib(ctx, outputMapping, prim->v[0],
  157.                  ctx->Current.RasterColor,
  158.                  VERT_RESULT_COL0, VERT_ATTRIB_COLOR0);
  159.  
  160.    update_attrib(ctx, outputMapping, prim->v[0],
  161.                  ctx->Current.RasterSecondaryColor,
  162.                  VERT_RESULT_COL1, VERT_ATTRIB_COLOR1);
  163.  
  164.    for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
  165.       update_attrib(ctx, outputMapping, prim->v[0],
  166.                     ctx->Current.RasterTexCoords[i],
  167.                     VERT_RESULT_TEX0 + i, VERT_ATTRIB_TEX0 + i);
  168.    }
  169.  
  170.    if (ctx->RenderMode == GL_SELECT) {
  171.       _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
  172.    }
  173. }
  174.  
  175.  
  176. /**
  177.  * Create rasterpos "drawing" stage.
  178.  */
  179. static struct rastpos_stage *
  180. new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw)
  181. {
  182.    struct rastpos_stage *rs = ST_CALLOC_STRUCT(rastpos_stage);
  183.    GLuint i;
  184.  
  185.    rs->stage.draw = draw;
  186.    rs->stage.next = NULL;
  187.    rs->stage.point = rastpos_point;
  188.    rs->stage.line = rastpos_line;
  189.    rs->stage.tri = rastpos_tri;
  190.    rs->stage.flush = rastpos_flush;
  191.    rs->stage.destroy = rastpos_destroy;
  192.    rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter;
  193.    rs->stage.destroy = rastpos_destroy;
  194.    rs->ctx = ctx;
  195.  
  196.    for (i = 0; i < Elements(rs->array); i++) {
  197.       rs->array[i].Size = 4;
  198.       rs->array[i].Type = GL_FLOAT;
  199.       rs->array[i].Format = GL_RGBA;
  200.       rs->array[i].Stride = 0;
  201.       rs->array[i].StrideB = 0;
  202.       rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i];
  203.       rs->array[i].Enabled = GL_TRUE;
  204.       rs->array[i].Normalized = GL_TRUE;
  205.       rs->array[i].BufferObj = NULL;
  206.       rs->arrays[i] = &rs->array[i];
  207.    }
  208.  
  209.    rs->prim.mode = GL_POINTS;
  210.    rs->prim.indexed = 0;
  211.    rs->prim.begin = 1;
  212.    rs->prim.end = 1;
  213.    rs->prim.weak = 0;
  214.    rs->prim.start = 0;
  215.    rs->prim.count = 1;
  216.  
  217.    return rs;
  218. }
  219.  
  220.  
  221. static void
  222. st_RasterPos(struct gl_context *ctx, const GLfloat v[4])
  223. {
  224.    struct st_context *st = st_context(ctx);
  225.    struct draw_context *draw = st->draw;
  226.    struct rastpos_stage *rs;
  227.  
  228.    if (st->rastpos_stage) {
  229.       /* get rastpos stage info */
  230.       rs = rastpos_stage(st->rastpos_stage);
  231.    }
  232.    else {
  233.       /* create rastpos draw stage */
  234.       rs = new_draw_rastpos_stage(ctx, draw);
  235.       st->rastpos_stage = &rs->stage;
  236.    }
  237.  
  238.    /* plug our rastpos stage into the draw module */
  239.    draw_set_rasterize_stage(st->draw, st->rastpos_stage);
  240.  
  241.    /* make sure everything's up to date */
  242.    st_validate_state(st);
  243.  
  244.    /* This will get set only if rastpos_point(), above, gets called */
  245.    ctx->Current.RasterPosValid = GL_FALSE;
  246.  
  247.    /* All vertex attribs but position were previously initialized above.
  248.     * Just plug in position pointer now.
  249.     */
  250.    rs->array[0].Ptr = (GLubyte *) v;
  251.  
  252.    /* draw the point */
  253.    st_feedback_draw_vbo(ctx, rs->arrays, &rs->prim, 1, NULL, GL_TRUE, 0, 1);
  254.  
  255.    /* restore draw's rasterization stage depending on rendermode */
  256.    if (ctx->RenderMode == GL_FEEDBACK) {
  257.       draw_set_rasterize_stage(draw, st->feedback_stage);
  258.    }
  259.    else if (ctx->RenderMode == GL_SELECT) {
  260.       draw_set_rasterize_stage(draw, st->selection_stage);
  261.    }
  262. }
  263.  
  264.  
  265.  
  266. void st_init_rasterpos_functions(struct dd_function_table *functions)
  267. {
  268.    functions->RasterPos = st_RasterPos;
  269. }
  270.  
  271. #endif /* FEATURE_rastpos */
  272.