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glamor: * 1/size is faster than / size in VS

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Pass the inverse of the texture size to glamor vertex shaders so that
we multiply by that instead of dividing by the size as multiplication
is generally faster than division.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Keith Packard
2015-01-17 07:44:27 +13:00
committed by Eric Anholt
parent 82634d2b69
commit e977b404d7
4 changed files with 17 additions and 17 deletions
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8
glamor/glamor_copy.c
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@@ -42,7 +42,7 @@ use_copyarea(PixmapPtr dst, GCPtr gc, glamor_program *prog, void *arg)
glBindTexture(GL_TEXTURE_2D, src->tex);
glUniform2f(prog->fill_offset_uniform, args->dx, args->dy);
glUniform2f(prog->fill_size_uniform, src->width, src->height);
glUniform2f(prog->fill_size_inv_uniform, 1.0f/src->width, 1.0f/src->height);
return TRUE;
}
@@ -51,7 +51,7 @@ static const glamor_facet glamor_facet_copyarea = {
"copy_area",
.vs_vars = "attribute vec2 primitive;\n",
.vs_exec = (GLAMOR_POS(gl_Position, primitive.xy)
" fill_pos = (fill_offset + primitive.xy) / fill_size;\n"),
" fill_pos = (fill_offset + primitive.xy) * fill_size_inv;\n"),
.fs_exec = " gl_FragColor = texture2D(sampler, fill_pos);\n",
.locations = glamor_program_location_fill,
.use = use_copyarea,
@@ -71,7 +71,7 @@ use_copyplane(PixmapPtr dst, GCPtr gc, glamor_program *prog, void *arg)
glBindTexture(GL_TEXTURE_2D, src->tex);
glUniform2f(prog->fill_offset_uniform, args->dx, args->dy);
glUniform2f(prog->fill_size_uniform, src->width, src->height);
glUniform2f(prog->fill_size_inv_uniform, 1.0f/src->width, 1.0f/src->height);
glamor_set_color(dst, gc->fgPixel, prog->fg_uniform);
glamor_set_color(dst, gc->bgPixel, prog->bg_uniform);
@@ -134,7 +134,7 @@ static const glamor_facet glamor_facet_copyplane = {
.version = 130,
.vs_vars = "attribute vec2 primitive;\n",
.vs_exec = (GLAMOR_POS(gl_Position, (primitive.xy))
" fill_pos = (fill_offset + primitive.xy) / fill_size;\n"),
" fill_pos = (fill_offset + primitive.xy) * fill_size_inv;\n"),
.fs_exec = (" uvec4 bits = uvec4(round(texture2D(sampler, fill_pos) * bitmul));\n"
" if ((bits & bitplane) != uvec4(0,0,0,0))\n"
" gl_FragColor = fg;\n"