/************************************************************************** * * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. * 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, sub license, 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 (including the * next paragraph) 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 NON-INFRINGEMENT. * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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. * **************************************************************************/ /** * glRasterPos implementation. Basically render a GL_POINT with our * private draw module. Plug in a special "rasterpos" stage at the end * of the 'draw' pipeline to capture the results and update the current * raster pos attributes. * * Authors: * Brian Paul */ #include "main/imports.h" #include "main/macros.h" #include "main/feedback.h" #include "st_context.h" #include "st_atom.h" #include "st_draw.h" #include "st_cb_rasterpos.h" #include "draw/draw_context.h" #include "draw/draw_pipe.h" #include "vbo/vbo.h" /** * Our special drawing pipeline stage (replaces rasterization). */ struct rastpos_stage { struct draw_stage stage; /**< Base class */ struct gl_context *ctx; /**< Rendering context */ /* vertex attrib info we can setup once and re-use */ struct gl_client_array array[VERT_ATTRIB_MAX]; const struct gl_client_array *arrays[VERT_ATTRIB_MAX]; struct _mesa_prim prim; }; static INLINE struct rastpos_stage * rastpos_stage( struct draw_stage *stage ) { return (struct rastpos_stage *) stage; } static void rastpos_flush( struct draw_stage *stage, unsigned flags ) { /* no-op */ } static void rastpos_reset_stipple_counter( struct draw_stage *stage ) { /* no-op */ } static void rastpos_tri( struct draw_stage *stage, struct prim_header *prim ) { /* should never get here */ assert(0); } static void rastpos_line( struct draw_stage *stage, struct prim_header *prim ) { /* should never get here */ assert(0); } static void rastpos_destroy(struct draw_stage *stage) { free(stage); } /** * Update a raster pos attribute from the vertex result if it's present, * else copy the current attrib. */ static void update_attrib(struct gl_context *ctx, const GLuint *outputMapping, const struct vertex_header *vert, GLfloat *dest, GLuint result, GLuint defaultAttrib) { const GLfloat *src; const GLuint k = outputMapping[result]; if (k != ~0U) src = vert->data[k]; else src = ctx->Current.Attrib[defaultAttrib]; COPY_4V(dest, src); } /** * Normally, this function would render a GL_POINT. */ static void rastpos_point(struct draw_stage *stage, struct prim_header *prim) { struct rastpos_stage *rs = rastpos_stage(stage); struct gl_context *ctx = rs->ctx; struct st_context *st = st_context(ctx); const GLfloat height = (GLfloat) ctx->DrawBuffer->Height; const GLuint *outputMapping = st->vertex_result_to_slot; const GLfloat *pos; GLuint i; /* if we get here, we didn't get clipped */ ctx->Current.RasterPosValid = GL_TRUE; /* update raster pos */ pos = prim->v[0]->data[0]; ctx->Current.RasterPos[0] = pos[0]; if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */ else ctx->Current.RasterPos[1] = pos[1]; ctx->Current.RasterPos[2] = pos[2]; ctx->Current.RasterPos[3] = pos[3]; /* update other raster attribs */ update_attrib(ctx, outputMapping, prim->v[0], ctx->Current.RasterColor, VARYING_SLOT_COL0, VERT_ATTRIB_COLOR0); update_attrib(ctx, outputMapping, prim->v[0], ctx->Current.RasterSecondaryColor, VARYING_SLOT_COL1, VERT_ATTRIB_COLOR1); for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) { update_attrib(ctx, outputMapping, prim->v[0], ctx->Current.RasterTexCoords[i], VARYING_SLOT_TEX0 + i, VERT_ATTRIB_TEX0 + i); } if (ctx->RenderMode == GL_SELECT) { _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] ); } } /** * Create rasterpos "drawing" stage. */ static struct rastpos_stage * new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw) { struct rastpos_stage *rs = ST_CALLOC_STRUCT(rastpos_stage); GLuint i; rs->stage.draw = draw; rs->stage.next = NULL; rs->stage.point = rastpos_point; rs->stage.line = rastpos_line; rs->stage.tri = rastpos_tri; rs->stage.flush = rastpos_flush; rs->stage.destroy = rastpos_destroy; rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter; rs->stage.destroy = rastpos_destroy; rs->ctx = ctx; for (i = 0; i < Elements(rs->array); i++) { rs->array[i].Size = 4; rs->array[i].Type = GL_FLOAT; rs->array[i].Format = GL_RGBA; rs->array[i].Stride = 0; rs->array[i].StrideB = 0; rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i]; rs->array[i].Enabled = GL_TRUE; rs->array[i].Normalized = GL_TRUE; rs->array[i].BufferObj = NULL; rs->arrays[i] = &rs->array[i]; } rs->prim.mode = GL_POINTS; rs->prim.indexed = 0; rs->prim.begin = 1; rs->prim.end = 1; rs->prim.weak = 0; rs->prim.start = 0; rs->prim.count = 1; return rs; } static void st_RasterPos(struct gl_context *ctx, const GLfloat v[4]) { struct st_context *st = st_context(ctx); struct draw_context *draw = st->draw; struct rastpos_stage *rs; const struct gl_client_array **saved_arrays = ctx->Array._DrawArrays; if (st->rastpos_stage) { /* get rastpos stage info */ rs = rastpos_stage(st->rastpos_stage); } else { /* create rastpos draw stage */ rs = new_draw_rastpos_stage(ctx, draw); st->rastpos_stage = &rs->stage; } /* plug our rastpos stage into the draw module */ draw_set_rasterize_stage(st->draw, st->rastpos_stage); /* make sure everything's up to date */ st_validate_state(st); /* This will get set only if rastpos_point(), above, gets called */ ctx->Current.RasterPosValid = GL_FALSE; /* All vertex attribs but position were previously initialized above. * Just plug in position pointer now. */ rs->array[0].Ptr = (GLubyte *) v; /* Draw the point. * * Don't set DriverFlags.NewArray. * st_feedback_draw_vbo doesn't check for that flag. */ ctx->Array._DrawArrays = rs->arrays; st_feedback_draw_vbo(ctx, &rs->prim, 1, NULL, GL_TRUE, 0, 1, NULL, NULL); ctx->Array._DrawArrays = saved_arrays; /* restore draw's rasterization stage depending on rendermode */ if (ctx->RenderMode == GL_FEEDBACK) { draw_set_rasterize_stage(draw, st->feedback_stage); } else if (ctx->RenderMode == GL_SELECT) { draw_set_rasterize_stage(draw, st->selection_stage); } } void st_init_rasterpos_functions(struct dd_function_table *functions) { functions->RasterPos = st_RasterPos; }