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-rw-r--r--xorg-server/glamor/glamor_transform.c215
1 files changed, 215 insertions, 0 deletions
diff --git a/xorg-server/glamor/glamor_transform.c b/xorg-server/glamor/glamor_transform.c
new file mode 100644
index 000000000..d6ba56421
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+++ b/xorg-server/glamor/glamor_transform.c
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+/*
+ * 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_transform.h"
+
+
+/*
+ * Set up rendering to target the specified drawable, computing an
+ * appropriate transform for the vertex shader to convert
+ * drawable-relative coordinates into pixmap-relative coordinates. If
+ * requested, the offset from pixmap origin coordinates back to window
+ * system coordinates will be returned in *p_off_x, *p_off_y so that
+ * clipping computations can be adjusted as appropriate
+ */
+
+void
+glamor_set_destination_drawable(DrawablePtr drawable,
+ int box_x,
+ int box_y,
+ Bool do_drawable_translate,
+ Bool center_offset,
+ GLint matrix_uniform_location,
+ int *p_off_x,
+ int *p_off_y)
+{
+ PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+ glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap);
+ int off_x, off_y;
+ BoxPtr box = glamor_pixmap_box_at(pixmap_priv, box_x, box_y);
+ int w = box->x2 - box->x1;
+ int h = box->y2 - box->y1;
+ float scale_x = 2.0f / (float) w;
+ float scale_y = 2.0f / (float) h;
+ float center_adjust = 0.0f;
+
+ glamor_get_drawable_deltas(drawable, pixmap, &off_x, &off_y);
+
+ off_x -= box->x1;
+ off_y -= box->y1;
+
+ if (p_off_x) {
+ *p_off_x = off_x;
+ *p_off_y = off_y;
+ }
+
+ /* A tricky computation to find the right value for the two linear functions
+ * that transform rendering coordinates to pixmap coordinates
+ *
+ * pixmap_x = render_x + drawable->x + off_x
+ * pixmap_y = render_y + drawable->y + off_y
+ *
+ * gl_x = pixmap_x * 2 / width - 1
+ * gl_y = pixmap_y * 2 / height - 1
+ *
+ * gl_x = (render_x + drawable->x + off_x) * 2 / width - 1
+ *
+ * gl_x = (render_x) * 2 / width + (drawable->x + off_x) * 2 / width - 1
+ *
+ * I'll think about yInverted later, when I have some way to test
+ */
+
+ if (do_drawable_translate) {
+ off_x += drawable->x;
+ off_y += drawable->y;
+ }
+
+ /*
+ * To get GL_POINTS drawn in the right spot, we need to adjust the
+ * coordinates by 1/2 a pixel.
+ */
+ if (center_offset)
+ center_adjust = 0.5f;
+
+ glUniform4f(matrix_uniform_location,
+ scale_x, (off_x + center_adjust) * scale_x - 1.0f,
+ scale_y, (off_y + center_adjust) * scale_y - 1.0f);
+
+ glamor_set_destination_pixmap_fbo(glamor_pixmap_fbo_at(pixmap_priv, box_x, box_y),
+ 0, 0, w, h);
+}
+
+/*
+ * Set up for solid rendering to the specified pixmap using alu, fg and planemask
+ * from the specified GC. Load the target color into the specified uniform
+ */
+
+void
+glamor_set_color(PixmapPtr pixmap,
+ CARD32 pixel,
+ GLint uniform)
+{
+ float color[4];
+
+ glamor_get_rgba_from_pixel(pixel,
+ &color[0], &color[1], &color[2], &color[3],
+ format_for_pixmap(pixmap));
+
+ glUniform4fv(uniform, 1, color);
+}
+
+Bool
+glamor_set_solid(PixmapPtr pixmap,
+ GCPtr gc,
+ Bool use_alu,
+ GLint uniform)
+{
+ CARD32 pixel;
+ int alu = use_alu ? gc->alu : GXcopy;
+
+ if (!glamor_set_planemask(pixmap, gc->planemask))
+ return FALSE;
+
+ pixel = gc->fgPixel;
+
+ if (!glamor_set_alu(pixmap->drawable.pScreen, alu)) {
+ switch (gc->alu) {
+ case GXclear:
+ pixel = 0;
+ break;
+ case GXcopyInverted:
+ pixel = ~pixel;
+ break;
+ case GXset:
+ pixel = ~0 & gc->planemask;
+ break;
+ default:
+ return FALSE;
+ }
+ }
+ glamor_set_color(pixmap, gc->fgPixel, uniform);
+
+ return TRUE;
+}
+
+Bool
+glamor_set_texture(PixmapPtr pixmap,
+ PixmapPtr texture,
+ int off_x,
+ int off_y,
+ GLint offset_uniform,
+ GLint size_uniform)
+{
+ glamor_pixmap_private *texture_priv;
+
+ texture_priv = glamor_get_pixmap_private(texture);
+
+ if (!GLAMOR_PIXMAP_PRIV_HAS_FBO(texture_priv))
+ return FALSE;
+
+ if (texture_priv->type == GLAMOR_TEXTURE_LARGE)
+ return FALSE;
+
+ glActiveTexture(GL_TEXTURE0);
+ glBindTexture(GL_TEXTURE_2D, texture_priv->base.fbo->tex);
+
+ glUniform2f(offset_uniform, off_x, off_y);
+ glUniform2f(size_uniform, texture->drawable.width, texture->drawable.height);
+ return TRUE;
+}
+
+Bool
+glamor_set_tiled(PixmapPtr pixmap,
+ GCPtr gc,
+ GLint offset_uniform,
+ GLint size_uniform)
+{
+ if (!glamor_set_alu(pixmap->drawable.pScreen, gc->alu))
+ return FALSE;
+
+ if (!glamor_set_planemask(pixmap, gc->planemask))
+ return FALSE;
+
+ return glamor_set_texture(pixmap,
+ gc->tile.pixmap,
+ -gc->patOrg.x,
+ -gc->patOrg.y,
+ offset_uniform,
+ size_uniform);
+}
+
+Bool
+glamor_set_stippled(PixmapPtr pixmap,
+ GCPtr gc,
+ GLint fg_uniform,
+ GLint offset_uniform,
+ GLint size_uniform)
+{
+ if (!glamor_set_solid(pixmap, gc, TRUE, fg_uniform))
+ return FALSE;
+
+ if (!glamor_set_texture(pixmap, gc->stipple, gc->patOrg.x, gc->patOrg.y, offset_uniform, size_uniform))
+ return FALSE;
+
+ return TRUE;
+}