glamor: Add glamor_program PolyPoint implementation

This accelerates poly point when possible by off-loading all geometry
computation to the GPU.

Improves x11perf -dot performance by 28109.5% +/- 1022.01% (n=3)

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>

1 files changed, 129 insertions, 0 deletions

diff --git a/glamor/glamor_points.c b/glamor/glamor_points.c
new file mode 100644
index 000000000..5399f96e8
--- /dev/null
+++ b/glamor/glamor_points.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright © 2009 Intel Corporation
+ * Copyright © 1998 Keith Packard
+ *
+ * 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, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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:
+ *    Zhigang Gong <zhigang.gong@linux.intel.com>
+ *
+ */
+
+#include "glamor_priv.h"
+#include "glamor_transform.h"
+
+static const glamor_facet glamor_facet_point = {
+    .name = "poly_point",
+    .vs_vars = "attribute vec2 primitive;\n",
+    .vs_exec = GLAMOR_POS(gl_Position, primitive),
+};
+
+Bool
+glamor_poly_point_nf(DrawablePtr drawable, GCPtr gc, int mode, int npt, DDXPointPtr ppt)
+{
+    ScreenPtr screen = drawable->pScreen;
+    glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
+    PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+    glamor_program *prog = &glamor_priv->point_prog;
+    glamor_pixmap_private *pixmap_priv;
+    int off_x, off_y;
+    GLshort *vbo_ppt;
+    char *vbo_offset;
+    int box_x, box_y;
+
+    pixmap_priv = glamor_get_pixmap_private(pixmap);
+    if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+        goto bail;
+
+    glamor_get_context(glamor_priv);
+
+    if (prog->failed)
+        goto bail_ctx;
+
+    if (!prog->prog) {
+        if (!glamor_build_program(screen, prog,
+                                  &glamor_facet_point,
+                                  &glamor_fill_solid))
+            goto bail_ctx;
+    }
+
+    if (!glamor_use_program(pixmap, gc, prog, NULL))
+        goto bail_ctx;
+
+    vbo_ppt = glamor_get_vbo_space(screen, npt * (2 * sizeof (INT16)), &vbo_offset);
+    glEnableVertexAttribArray(GLAMOR_VERTEX_POS);
+    glVertexAttribPointer(GLAMOR_VERTEX_POS, 2, GL_SHORT, GL_FALSE, 0, vbo_offset);
+    if (mode == CoordModePrevious) {
+        int n = npt;
+        INT16 x = 0, y = 0;
+        while (n--) {
+            vbo_ppt[0] = (x += ppt->x);
+            vbo_ppt[1] = (y += ppt->y);
+            vbo_ppt += 2;
+            ppt++;
+        }
+    } else
+        memcpy(vbo_ppt, ppt, npt * (2 * sizeof (INT16)));
+    glamor_put_vbo_space(screen);
+
+    glEnable(GL_SCISSOR_TEST);
+
+    glamor_pixmap_loop(pixmap_priv, box_x, box_y) {
+        int nbox = RegionNumRects(gc->pCompositeClip);
+        BoxPtr box = RegionRects(gc->pCompositeClip);
+
+        glamor_set_destination_drawable(drawable, box_x, box_y, 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(GL_POINTS, 0, npt);
+        }
+    }
+
+    glDisable(GL_SCISSOR_TEST);
+    glDisable(GL_COLOR_LOGIC_OP);
+    glDisableVertexAttribArray(GLAMOR_VERTEX_POS);
+
+    glamor_put_context(glamor_priv);
+
+    glamor_priv->state = RENDER_STATE;
+    glamor_priv->render_idle_cnt = 0;
+
+    return TRUE;
+
+bail_ctx:
+    glDisable(GL_COLOR_LOGIC_OP);
+    glamor_put_context(glamor_priv);
+bail:
+    return FALSE;
+}
+
+void
+glamor_poly_point(DrawablePtr drawable, GCPtr gc, int mode, int npt,
+                  DDXPointPtr ppt)
+{
+    if (glamor_poly_point_nf(drawable, gc, mode, npt, ppt))
+        return;
+    miPolyPoint(drawable, gc, mode, npt, ppt);
+}