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Adds ColorMask support to Cogl

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This adds CoglPipeline and CoglFramebuffer support for setting a color
mask which is a bit mask defining which color channels should be written
to the current framebuffer.

The final color mask is the intersection of the framebuffer color mask
and the pipeline color mask. The framebuffer mask affects all rendering
to the framebuffer while the pipeline masks can be used to affect
individual primitives.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg
2011-07-11 02:27:54 +01:00
parent 9b6c1eb2cc
commit 8b34a39319
11 changed files with 260 additions and 3 deletions
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38
cogl/cogl-framebuffer.c
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@ -155,6 +155,8 @@ _cogl_framebuffer_init (CoglFramebuffer *framebuffer,
framebuffer->dirty_bitmasks = TRUE;
framebuffer->color_mask = COGL_COLOR_MASK_ALL;
/* Initialise the clip stack */
_cogl_clip_state_init (&framebuffer->clip_state);
@ -238,8 +240,24 @@ _cogl_clear4f (unsigned long buffers,
if (buffers & COGL_BUFFER_BIT_COLOR)
{
CoglFramebuffer *draw_framebuffer;
GE( ctx, glClearColor (red, green, blue, alpha) );
gl_buffers |= GL_COLOR_BUFFER_BIT;
draw_framebuffer = cogl_get_draw_framebuffer ();
if (ctx->current_gl_color_mask != draw_framebuffer->color_mask)
{
CoglColorMask color_mask = draw_framebuffer->color_mask;
GE( ctx, glColorMask (!!(color_mask & COGL_COLOR_MASK_RED),
!!(color_mask & COGL_COLOR_MASK_GREEN),
!!(color_mask & COGL_COLOR_MASK_BLUE),
!!(color_mask & COGL_COLOR_MASK_ALPHA)));
ctx->current_gl_color_mask = color_mask;
/* Make sure the ColorMask is updated when the next primitive is drawn */
ctx->current_pipeline_changes_since_flush |=
COGL_PIPELINE_STATE_LOGIC_OPS;
}
}
if (buffers & COGL_BUFFER_BIT_DEPTH)
@ -1492,6 +1510,26 @@ cogl_framebuffer_get_alpha_bits (CoglFramebuffer *framebuffer)
return framebuffer->alpha_bits;
}
CoglColorMask
cogl_framebuffer_get_color_mask (CoglFramebuffer *framebuffer)
{
return framebuffer->color_mask;
}
void
cogl_framebuffer_set_color_mask (CoglFramebuffer *framebuffer,
CoglColorMask color_mask)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
cogl_flush (); /* XXX: Currently color mask changes don't go through the journal */
framebuffer->color_mask = color_mask;
/* Make sure the ColorMask is updated when the next primitive is drawn */
ctx->current_pipeline_changes_since_flush |=
COGL_PIPELINE_STATE_LOGIC_OPS;
}
gboolean
cogl_framebuffer_get_dither_enabled (CoglFramebuffer *framebuffer)
{