Edit
IABSD.fr/xenocara/xserver/glamor/glamor_dash.c
matthieu
- xserver/glamor/glamor_dash.c
-
/* * Copyright © 2014 Keith Packard * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that copyright * notice and this permission notice appear in supporting documentation, and * that the name of the copyright holders not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. The copyright holders make no representations * about the suitability of this software for any purpose. It is provided "as * is" without express or implied warranty. * * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE * OF THIS SOFTWARE. */ #include "glamor_priv.h" #include "glamor_program.h" #include "glamor_transform.h" #include "glamor_transfer.h" #include "glamor_prepare.h" static const char dash_vs_vars[] = "attribute vec3 primitive;\n" "varying float dash_offset;\n"; static const char dash_vs_exec[] = " dash_offset = primitive.z / dash_length;\n" " vec2 pos = vec2(0,0);\n" GLAMOR_POS(gl_Position, primitive.xy); static const char dash_fs_vars[] = "varying float dash_offset;\n"; static const char on_off_fs_exec[] = " float pattern = texture2D(dash, vec2(dash_offset, 0.5)).w;\n" " if (pattern == 0.0)\n" " discard;\n"; /* XXX deal with stippled double dashed lines once we have stippling support */ static const char double_fs_exec[] = " float pattern = texture2D(dash, vec2(dash_offset, 0.5)).w;\n" " if (pattern == 0.0)\n" " gl_FragColor = bg;\n" " else\n" " gl_FragColor = fg;\n"; static const glamor_facet glamor_facet_on_off_dash_lines = { .version = 130, .name = "poly_lines_on_off_dash", .vs_vars = dash_vs_vars, .vs_exec = dash_vs_exec, .fs_vars = dash_fs_vars, .fs_exec = on_off_fs_exec, .locations = glamor_program_location_dash, }; static const glamor_facet glamor_facet_double_dash_lines = { .version = 130, .name = "poly_lines_double_dash", .vs_vars = dash_vs_vars, .vs_exec = dash_vs_exec, .fs_vars = dash_fs_vars, .fs_exec = double_fs_exec, .locations = (glamor_program_location_dash| glamor_program_location_fg| glamor_program_location_bg), }; static PixmapPtr glamor_get_dash_pixmap(GCPtr gc) { glamor_gc_private *gc_priv = glamor_get_gc_private(gc); ScreenPtr screen = gc->pScreen; PixmapPtr pixmap; int offset; int d; uint32_t pixel; GCPtr scratch_gc; if (gc_priv->dash) return gc_priv->dash; offset = 0; for (d = 0; d < gc->numInDashList; d++) offset += gc->dash[d]; pixmap = glamor_create_pixmap(screen, offset, 1, 8, 0); if (!pixmap) goto bail; scratch_gc = GetScratchGC(8, screen); if (!scratch_gc) goto bail_pixmap; pixel = 0xffffffff; offset = 0; for (d = 0; d < gc->numInDashList; d++) { xRectangle rect; ChangeGCVal changes; changes.val = pixel; (void) ChangeGC(NullClient, scratch_gc, GCForeground, &changes); ValidateGC(&pixmap->drawable, scratch_gc); rect.x = offset; rect.y = 0; rect.width = gc->dash[d]; rect.height = 1; scratch_gc->ops->PolyFillRect (&pixmap->drawable, scratch_gc, 1, &rect); offset += gc->dash[d]; pixel = ~pixel; } FreeScratchGC(scratch_gc); gc_priv->dash = pixmap; return pixmap; bail_pixmap: glamor_destroy_pixmap(pixmap); bail: return NULL; } static glamor_program * glamor_dash_setup(DrawablePtr drawable, GCPtr gc) { ScreenPtr screen = drawable->pScreen; glamor_screen_private *glamor_priv = glamor_get_screen_private(screen); PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable); glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap); PixmapPtr dash_pixmap; glamor_pixmap_private *dash_priv; glamor_program *prog; if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv)) goto bail; if (gc->lineWidth != 0) goto bail; dash_pixmap = glamor_get_dash_pixmap(gc); dash_priv = glamor_get_pixmap_private(dash_pixmap); if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(dash_priv)) goto bail; glamor_make_current(glamor_priv); switch (gc->lineStyle) { case LineOnOffDash: prog = glamor_use_program_fill(pixmap, gc, &glamor_priv->on_off_dash_line_progs, &glamor_facet_on_off_dash_lines); if (!prog) goto bail; break; case LineDoubleDash: if (gc->fillStyle != FillSolid) goto bail; prog = &glamor_priv->double_dash_line_prog; if (!prog->prog) { if (!glamor_build_program(screen, prog, &glamor_facet_double_dash_lines, NULL, NULL, NULL)) goto bail; } if (!glamor_use_program(pixmap, gc, prog, NULL)) goto bail; glamor_set_color(pixmap, gc->fgPixel, prog->fg_uniform); glamor_set_color(pixmap, gc->bgPixel, prog->bg_uniform); break; default: goto bail; } /* Set the dash pattern as texture 1 */ glamor_bind_texture(glamor_priv, GL_TEXTURE1, dash_priv->fbo, FALSE); glUniform1i(prog->dash_uniform, 1); glUniform1f(prog->dash_length_uniform, dash_pixmap->drawable.width); return prog; bail: return NULL; } static void glamor_dash_loop(DrawablePtr drawable, GCPtr gc, glamor_program *prog, int n, GLenum mode) { PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable); glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap); int box_index; int off_x, off_y; glEnable(GL_SCISSOR_TEST); glamor_pixmap_loop(pixmap_priv, box_index) { int nbox = RegionNumRects(gc->pCompositeClip); BoxPtr box = RegionRects(gc->pCompositeClip); glamor_set_destination_drawable(drawable, box_index, TRUE, TRUE, prog->matrix_uniform, &off_x, &off_y); while (nbox--) { glScissor(box->x1 + off_x, box->y1 + off_y, box->x2 - box->x1, box->y2 - box->y1); box++; glDrawArrays(mode, 0, n); } } glDisable(GL_SCISSOR_TEST); glDisableVertexAttribArray(GLAMOR_VERTEX_POS); } static int glamor_line_length(short x1, short y1, short x2, short y2) { return max(abs(x2 - x1), abs(y2 - y1)); } Bool glamor_poly_lines_dash_gl(DrawablePtr drawable, GCPtr gc, int mode, int n, DDXPointPtr points) { ScreenPtr screen = drawable->pScreen; glamor_program *prog; short *v; char *vbo_offset; int add_last; int dash_pos; int prev_x, prev_y; int i; if (n < 2) return TRUE; if (!(prog = glamor_dash_setup(drawable, gc))) return FALSE; add_last = 0; if (gc->capStyle != CapNotLast) add_last = 1; /* Set up the vertex buffers for the points */ v = glamor_get_vbo_space(drawable->pScreen, (n + add_last) * 3 * sizeof (short), &vbo_offset); glEnableVertexAttribArray(GLAMOR_VERTEX_POS); glVertexAttribPointer(GLAMOR_VERTEX_POS, 3, GL_SHORT, GL_FALSE, 3 * sizeof (short), vbo_offset); dash_pos = gc->dashOffset; prev_x = prev_y = 0; for (i = 0; i < n; i++) { int this_x = points[i].x; int this_y = points[i].y; if (i) { if (mode == CoordModePrevious) { this_x += prev_x; this_y += prev_y; } dash_pos += glamor_line_length(prev_x, prev_y, this_x, this_y); } v[0] = prev_x = this_x; v[1] = prev_y = this_y; v[2] = dash_pos; v += 3; } if (add_last) { v[0] = prev_x + 1; v[1] = prev_y; v[2] = dash_pos + 1; } glamor_put_vbo_space(screen); glamor_dash_loop(drawable, gc, prog, n + add_last, GL_LINE_STRIP); return TRUE; } static short * glamor_add_segment(short *v, short x1, short y1, short x2, short y2, int dash_start, int dash_end) { v[0] = x1; v[1] = y1; v[2] = dash_start; v[3] = x2; v[4] = y2; v[5] = dash_end; return v + 6; } Bool glamor_poly_segment_dash_gl(DrawablePtr drawable, GCPtr gc, int nseg, xSegment *segs) { ScreenPtr screen = drawable->pScreen; glamor_program *prog; short *v; char *vbo_offset; int dash_start = gc->dashOffset; int add_last; int i; if (!(prog = glamor_dash_setup(drawable, gc))) return FALSE; add_last = 0; if (gc->capStyle != CapNotLast) add_last = 1; /* Set up the vertex buffers for the points */ v = glamor_get_vbo_space(drawable->pScreen, (nseg<<add_last) * 6 * sizeof (short), &vbo_offset); glEnableVertexAttribArray(GLAMOR_VERTEX_POS); glVertexAttribPointer(GLAMOR_VERTEX_POS, 3, GL_SHORT, GL_FALSE, 3 * sizeof (short), vbo_offset); for (i = 0; i < nseg; i++) { int dash_end = dash_start + glamor_line_length(segs[i].x1, segs[i].y1, segs[i].x2, segs[i].y2); v = glamor_add_segment(v, segs[i].x1, segs[i].y1, segs[i].x2, segs[i].y2, dash_start, dash_end); if (add_last) v = glamor_add_segment(v, segs[i].x2, segs[i].y2, segs[i].x2 + 1, segs[i].y2, dash_end, dash_end + 1); } glamor_put_vbo_space(screen); glamor_dash_loop(drawable, gc, prog, nseg << (1 + add_last), GL_LINES); return TRUE; }