xserver-multidpi/glamor/glamor_transform.h
Keith Packard 181a4bd0cc glamor: Preserve GL_RED bits in R channel when destination is GL_RED [v2]
A1 and A8 pixmaps are usually stored in the Red channel to conform
with more recent GL versions. When using these pixmaps as mask values,
that works great. When using these pixmaps as source values, then the
value we want depends on what the destination looks like.

For RGBA or RGB destinations, then we want to use the Red channel
for A values and leave RGB all set to zero.

For A destinations, then we want to leave the R values in the Red
channel so that they end up in the Red channel of the output.

This patch adds a helper function, glamor_bind_texture, which performs
the glBindTexture call along with setting the swizzle parameter
correctly for the Red channel. The swizzle parameter for the Alpha
channel doesn't depend on the destination as it's safe to leave it
always swizzled from the Red channel.

This fixes incorrect rendering in firefox for this page:

	https://gfycat.com/HoarseCheapAmericankestrel

while not breaking rendering for this page:

	https://feedly.com

v2: Add change accidentally left in patch for missing
    glDisable(GL_COLOR_LOGIC_OP).
    Found by Emil Velikov <emil.l.velikov@gmail.com>

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63397
Signed-off-by: Keith Packard <keithp@keithp.com>
Tested-by: Michel Dänzer <michel.daenzer@amd.com>
2016-05-26 09:17:59 -07:00

101 lines
3.7 KiB
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.
*/
#ifndef _GLAMOR_TRANSFORM_H_
#define _GLAMOR_TRANSFORM_H_
void
glamor_set_destination_drawable(DrawablePtr drawable,
int box_index,
Bool do_drawable_translate,
Bool center_offset,
GLint matrix_uniform_location,
int *p_off_x,
int *p_off_y);
void
glamor_set_color_depth(ScreenPtr pScreen,
int depth,
CARD32 pixel,
GLint uniform);
static inline void
glamor_set_color(PixmapPtr pixmap,
CARD32 pixel,
GLint uniform)
{
glamor_set_color_depth(pixmap->drawable.pScreen,
pixmap->drawable.depth, pixel, uniform);
}
Bool
glamor_set_texture_pixmap(PixmapPtr texture,
Bool destination_red);
Bool
glamor_set_texture(PixmapPtr texture,
Bool destination_red,
int off_x,
int off_y,
GLint offset_uniform,
GLint size_uniform);
Bool
glamor_set_solid(PixmapPtr pixmap,
GCPtr gc,
Bool use_alu,
GLint uniform);
Bool
glamor_set_tiled(PixmapPtr pixmap,
GCPtr gc,
GLint offset_uniform,
GLint size_uniform);
Bool
glamor_set_stippled(PixmapPtr pixmap,
GCPtr gc,
GLint fg_uniform,
GLint offset_uniform,
GLint size_uniform);
/*
* Vertex shader bits that transform X coordinates to pixmap
* coordinates using the matrix computed above
*/
#define GLAMOR_DECLARE_MATRIX "uniform vec4 v_matrix;\n"
#define GLAMOR_X_POS(x) #x " *v_matrix.x + v_matrix.y"
#define GLAMOR_Y_POS(y) #y " *v_matrix.z + v_matrix.w"
#if 0
#define GLAMOR_POS(dst,src) \
" " #dst ".x = " #src ".x * v_matrix.x + v_matrix.y;\n" \
" " #dst ".y = " #src ".y * v_matrix.z + v_matrix.w;\n" \
" " #dst ".z = 0.0;\n" \
" " #dst ".w = 1.0;\n"
#endif
#define GLAMOR_POS(dst,src) \
" " #dst ".xy = " #src ".xy * v_matrix.xz + v_matrix.yw;\n" \
" " #dst ".zw = vec2(0.0,1.0);\n"
#endif /* _GLAMOR_TRANSFORM_H_ */