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-rw-r--r--src/mesa/state_tracker/st_cb_rasterpos.c261
1 files changed, 261 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_rasterpos.c b/src/mesa/state_tracker/st_cb_rasterpos.c
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+/**************************************************************************
+ *
+ * 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 "st_draw.h"
+#include "draw/draw_context.h"
+#include "draw/draw_pipe.h"
+#include "shader/prog_instruction.h"
+#include "vbo/vbo.h"
+
+
+
+/**
+ * Our special drawing pipeline stage (replaces rasterization).
+ */
+struct rastpos_stage
+{
+ struct draw_stage stage; /**< Base class */
+ GLcontext *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(GLcontext *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);
+ GLcontext *ctx = rs->ctx;
+ struct st_context *st = ctx->st;
+ 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(GLcontext *ctx, struct draw_context *draw)
+{
+ struct rastpos_stage *rs = 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 < VERT_ATTRIB_MAX; i++) {
+ rs->array[i].Size = 4;
+ rs->array[i].Type = GL_FLOAT;
+ 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(GLcontext *ctx, const GLfloat v[4])
+{
+ struct st_context *st = ctx->st;
+ 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(ctx->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, 0, 1);
+}
+
+
+
+void st_init_rasterpos_functions(struct dd_function_table *functions)
+{
+ functions->RasterPos = st_RasterPos;
+}