svn merge ^/branches/released .

1 files changed, 271 insertions, 0 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_cb_rasterpos.c b/mesalib/src/mesa/state_tracker/st_cb_rasterpos.c
new file mode 100644
index 000000000..873560f45
--- /dev/null
+++ b/mesalib/src/mesa/state_tracker/st_cb_rasterpos.c
@@ -0,0 +1,271 @@
+/**************************************************************************

+ * 

+ * 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"

+

+

+#if FEATURE_rastpos

+

+/**

+ * 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,

+                 VERT_RESULT_COL0, VERT_ATTRIB_COLOR0);

+

+   update_attrib(ctx, outputMapping, prim->v[0],

+                 ctx->Current.RasterSecondaryColor,

+                 VERT_RESULT_COL1, VERT_ATTRIB_COLOR1);

+

+   for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {

+      update_attrib(ctx, outputMapping, prim->v[0],

+                    ctx->Current.RasterTexCoords[i],

+                    VERT_RESULT_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;

+

+   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 */

+   st_feedback_draw_vbo(ctx, rs->arrays, &rs->prim, 1, NULL, GL_TRUE, 0, 1);

+

+   /* 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;

+}

+

+#endif /* FEATURE_rastpos */