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glamor: Remove shader-based trapezoid implementation. Fixes Bug 76213.

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I can't find any performance benefit to using the GL path and the code
renders this trapezoid incorrectly:

  		                 top: FIXED   29.50
		              bottom: FIXED   30.00
		            left top: POINT    0.00,   29.50
		         left bottom: POINT    0.00,   30.50
		           right top: POINT -127.50,   29.50
		        right bottom: POINT   52.50,   30.00

This should render a solid line from 0,30 to 52,30 but draws nothing.

The code also uses an area computation for trapezoid coverage which
does not conform to the Render specification which requires a specific
point sampling technique.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Keith Packard 2014-08-06 12:58:38 -07:00
parent b2452311bd
commit 7e6bd54684
3 changed files with 37 additions and 1685 deletions
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6
glamor/glamor.c
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@ -515,9 +515,6 @@ glamor_init(ScreenPtr screen, unsigned int flags)
glamor_init_vbo(screen);
glamor_init_pixmap_fbo(screen);
#ifdef GLAMOR_TRAPEZOID_SHADER
glamor_init_trapezoid_shader(screen);
#endif
glamor_init_finish_access_shaders(screen);
#ifdef GLAMOR_GRADIENT_SHADER
glamor_init_gradient_shader(screen);
@ -546,9 +543,6 @@ glamor_release_screen_priv(ScreenPtr screen)
#endif
glamor_fini_vbo(screen);
glamor_fini_pixmap_fbo(screen);
#ifdef GLAMOR_TRAPEZOID_SHADER
glamor_fini_trapezoid_shader(screen);
#endif
glamor_fini_finish_access_shaders(screen);
#ifdef GLAMOR_GRADIENT_SHADER
glamor_fini_gradient_shader(screen);

6
glamor/glamor_priv.h
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@ -306,9 +306,6 @@ typedef struct glamor_screen_private {
int linear_max_nstops;
int radial_max_nstops;
/* glamor trapezoid shader. */
GLint trapezoid_prog;
PixmapPtr *back_pixmap;
int screen_fbo;
struct glamor_saved_procs saved_procs;
@ -745,8 +742,6 @@ void glamor_composite_glyph_rects(CARD8 op,
void glamor_composite_rects(CARD8 op,
PicturePtr pDst,
xRenderColor *color, int nRect, xRectangle *rects);
void glamor_init_trapezoid_shader(ScreenPtr screen);
void glamor_fini_trapezoid_shader(ScreenPtr screen);
PicturePtr glamor_convert_gradient_picture(ScreenPtr screen,
PicturePtr source,
int x_source,
@ -1089,7 +1084,6 @@ void glamor_xv_render(glamor_port_private *port_priv);
#define GLAMOR_PIXMAP_DYNAMIC_UPLOAD
#define GLAMOR_GRADIENT_SHADER
#define GLAMOR_TRAPEZOID_SHADER
#define GLAMOR_TEXTURED_LARGE_PIXMAP 1
#define WALKAROUND_LARGE_TEXTURE_MAP
#if 0

1710
glamor/glamor_trapezoid.c
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