+++ /dev/null
-/**************************************************************************
- *
- * 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.
- *
- **************************************************************************/
-
-/* Authors: Keith Whitwell <keith@tungstengraphics.com>
- */
-
-/* Implement line stipple by cutting lines up into smaller lines.
- * There are hundreds of ways to implement line stipple, this is one
- * choice that should work in all situations, requires no state
- * manipulations, but with a penalty in terms of large amounts of
- * generated geometry.
- */
-
-#include "imports.h"
-#include "macros.h"
-
-#define CLIP_PRIVATE
-#include "clip/clip_context.h"
-
-#define CLIP_PIPE_PRIVATE
-#include "clip/clip_pipe.h"
-
-
-
-struct stipple_stage {
- struct clip_pipe_stage stage;
-
- GLuint hw_data_offset;
-
- GLfloat counter;
- GLuint pattern;
- GLuint factor;
-};
-
-
-
-
-static INLINE struct stipple_stage *stipple_stage( struct clip_pipe_stage *stage )
-{
- return (struct stipple_stage *)stage;
-}
-
-
-
-
-static void interp_attr( const struct vf_attr *a,
- GLubyte *vdst,
- GLfloat t,
- const GLubyte *vin,
- const GLubyte *vout )
-{
- GLuint offset = a->vertoffset;
- GLfloat fin[4], fout[4], fdst[4];
-
- a->extract( a, fin, vin + offset );
- a->extract( a, fout, vout + offset );
-
- fdst[0] = LINTERP( t, fout[0], fin[0] );
- fdst[1] = LINTERP( t, fout[1], fin[1] );
- fdst[2] = LINTERP( t, fout[2], fin[2] );
- fdst[3] = LINTERP( t, fout[3], fin[3] );
-
- a->insert[4-1]( a, vdst + offset, fdst );
-}
-
-
-
-
-/* Weird screen-space interpolation?? Otherwise do something special
- * with pos.w or fix vertices to always have clip coords available.
- */
-static void screen_interp( struct vertex_fetch *vf,
- struct vertex_header *dst,
- GLfloat t,
- const struct vertex_header *out,
- const struct vertex_header *in )
-{
- GLubyte *vdst = (GLubyte *)dst;
- const GLubyte *vin = (const GLubyte *)in;
- const GLubyte *vout = (const GLubyte *)out;
-
- const struct vf_attr *a = vf->attr;
- const GLuint attr_count = vf->attr_count;
- GLuint j;
-
- /* Vertex header.
- */
- {
- assert(a[0].attrib == VF_ATTRIB_VERTEX_HEADER);
- dst->clipmask = 0;
- dst->edgeflag = 0;
- dst->pad = 0;
- dst->index = 0xffff;
- }
-
-
- /* Other attributes
- */
- for (j = 1; j < attr_count; j++) {
- interp_attr(&a[j], vdst, t, vin, vout);
- }
-}
-
-
-
-/* Clip a line against the viewport and user clip planes.
- */
-static void draw_line_segment( struct clip_pipe_stage *stage,
- struct prim_header *header,
- GLfloat t0,
- GLfloat t1 )
-{
- struct vertex_fetch *vf = stage->pipe->draw->vb.vf;
- struct vertex_header *v0 = header->v[0];
- struct vertex_header *v1 = header->v[1];
-
- struct prim_header newprim = *header;
- header = &newprim;
-
- _mesa_printf("%s %f %f\n", __FUNCTION__, t0, t1);
-
- if (t0 > 0.0) {
- screen_interp( vf, stage->tmp[0], t0, v0, v1 );
- header->v[0] = stage->tmp[0];
- }
-
- if (t1 < 1.0) {
- screen_interp( vf, stage->tmp[1], t1, v0, v1 );
- header->v[1] = stage->tmp[1];
- }
-
- stage->next->line( stage->next, header );
-}
-
-
-
-/* XXX: don't really want to iterate like this.
- */
-static INLINE unsigned
-stipple_test(int counter, ushort pattern, int factor)
-{
- int b = (counter / factor) & 0xf;
- return (1 << b) & pattern;
-}
-
-
-
-/* XXX: Need to have precalculated flatshading already.
- */
-static void stipple_line( struct clip_pipe_stage *stage,
- struct prim_header *header )
-{
- struct stipple_stage *stipple = stipple_stage(stage);
- GLuint hw_data_offset = stipple->hw_data_offset;
- const GLfloat *pos0 = (GLfloat *)&(header->v[0]->data[hw_data_offset]);
- const GLfloat *pos1 = (GLfloat *)&(header->v[1]->data[hw_data_offset]);
- GLfloat start = 0;
- int state = 0;
-
- GLfloat x0 = (GLfloat)pos0[0];
- GLfloat x1 = (GLfloat)pos1[0];
- GLfloat y0 = (GLfloat)pos0[1];
- GLfloat y1 = (GLfloat)pos1[1];
-
- GLfloat dx = x0 > x1 ? x0 - x1 : x1 - x0;
- GLfloat dy = y0 > y1 ? y0 - y1 : y1 - y0;
-
- GLfloat length = MAX2(dx, dy);
- GLint i;
-
- if (header->reset_line_stipple)
- stipple->counter = 0;
-
- /* XXX: iterating like this is lame
- */
- for (i = 0; i < length; i++) {
- int result = !!stipple_test( stipple->counter+i, stipple->pattern, stipple->factor );
-// _mesa_printf("%d %f %d\n", i, length, result);
- if (result != state) {
- if (state) {
- if (start != i)
- draw_line_segment( stage, header, start / length, i / length );
- }
- else {
- start = i;
- }
- state = result;
- }
- }
-
- if (state && start < length)
- draw_line_segment( stage, header, start / length, 1.0 );
-
- stipple->counter += length;
-}
-
-
-
-static void stipple_begin( struct clip_pipe_stage *stage )
-{
- struct stipple_stage *stipple = stipple_stage(stage);
- struct clip_context *draw = stage->pipe->draw;
-
- if (stage->pipe->draw->vb_state.clipped_prims)
- stipple->hw_data_offset = 16;
- else
- stipple->hw_data_offset = 0;
-
- stipple->stage.tri = clip_passthrough_tri;
- stipple->stage.point = clip_passthrough_point;
-
- stipple->stage.line = stipple_line;
- stipple->factor = draw->state.line_stipple_factor + 1;
- stipple->pattern = draw->state.line_stipple_pattern;
-
- stage->next->begin( stage->next );
-}
-
-
-static void stipple_end( struct clip_pipe_stage *stage )
-{
- stage->next->end( stage->next );
-}
-
-
-static void stipple_destroy( struct clip_pipe_stage *stage )
-{
- FREE( stage );
-}
-
-
-struct clip_pipe_stage *clip_pipe_stipple( struct clip_pipeline *pipe )
-{
- struct stipple_stage *stipple = CALLOC_STRUCT(stipple_stage);
-
- clip_pipe_alloc_tmps( &stipple->stage, 4 );
-
- stipple->stage.pipe = pipe;
- stipple->stage.next = NULL;
- stipple->stage.begin = stipple_begin;
- stipple->stage.point = clip_passthrough_point;
- stipple->stage.line = stipple_line;
- stipple->stage.tri = clip_passthrough_tri;
- stipple->stage.end = stipple_end;
- stipple->stage.destroy = stipple_destroy;
-
- return &stipple->stage;
-}
projects / mesa.git / commitdiff