1 /************************************************************************** 2 * 3 * Copyright 2007 VMware, Inc. 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 VMWARE 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 #include "main/rastpos.h" 43 44 #include "st_context.h" 45 #include "st_atom.h" 46 #include "st_draw.h" 47 #include "st_program.h" 48 #include "st_cb_rasterpos.h" 49 #include "draw/draw_context.h" 50 #include "draw/draw_pipe.h" 51 #include "vbo/vbo.h" 52 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_vertex_array array[VERT_ATTRIB_MAX]; 64 const struct gl_vertex_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 ubyte *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 ubyte *outputMapping = st->vp->result_to_output; 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 VARYING_SLOT_COL0, VERT_ATTRIB_COLOR0); 159 160 update_attrib(ctx, outputMapping, prim->v[0], 161 ctx->Current.RasterSecondaryColor, 162 VARYING_SLOT_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 VARYING_SLOT_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 < ARRAY_SIZE(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].StrideB = 0; 201 rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i]; 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_get_draw_context(st); 224 struct rastpos_stage *rs; 225 const struct gl_vertex_array **saved_arrays = ctx->Array._DrawArrays; 226 227 if (!st->draw) 228 return; 229 230 if (ctx->VertexProgram._Current == NULL || 231 ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram) { 232 /* No vertex shader/program is enabled, used the simple/fast fixed- 233 * function implementation of RasterPos. 234 */ 235 _mesa_RasterPos(ctx, v); 236 return; 237 } 238 239 if (st->rastpos_stage) { 240 /* get rastpos stage info */ 241 rs = rastpos_stage(st->rastpos_stage); 242 } 243 else { 244 /* create rastpos draw stage */ 245 rs = new_draw_rastpos_stage(ctx, draw); 246 st->rastpos_stage = &rs->stage; 247 } 248 249 /* plug our rastpos stage into the draw module */ 250 draw_set_rasterize_stage(st->draw, st->rastpos_stage); 251 252 /* make sure everything's up to date */ 253 st_validate_state(st, ST_PIPELINE_RENDER); 254 255 /* This will get set only if rastpos_point(), above, gets called */ 256 ctx->Current.RasterPosValid = GL_FALSE; 257 258 /* All vertex attribs but position were previously initialized above. 259 * Just plug in position pointer now. 260 */ 261 rs->array[0].Ptr = (GLubyte *) v; 262 263 /* Draw the point. 264 * 265 * Don't set DriverFlags.NewArray. 266 * st_feedback_draw_vbo doesn't check for that flag. */ 267 ctx->Array._DrawArrays = rs->arrays; 268 st_feedback_draw_vbo(ctx, &rs->prim, 1, NULL, GL_TRUE, 0, 1, 269 NULL, 0, NULL); 270 ctx->Array._DrawArrays = saved_arrays; 271 272 /* restore draw's rasterization stage depending on rendermode */ 273 if (ctx->RenderMode == GL_FEEDBACK) { 274 draw_set_rasterize_stage(draw, st->feedback_stage); 275 } 276 else if (ctx->RenderMode == GL_SELECT) { 277 draw_set_rasterize_stage(draw, st->selection_stage); 278 } 279 } 280 281 282 283 void st_init_rasterpos_functions(struct dd_function_table *functions) 284 { 285 functions->RasterPos = st_RasterPos; 286 } 287