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[cogl] Adds a bitfield argument to cogl_clear for specifying which buffers to clear

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Redundant clearing of depth and stencil buffers every render can be very
expensive, so cogl now gives control over which auxiliary buffers are
cleared.

Note: For now clutter continues to clear the color, depth and stencil buffer
each paint.
This commit is contained in:
Robert Bragg 2009-04-24 18:09:52 +01:00
parent 598939cee1
commit 2d94b3f46f
2 changed files with 41 additions and 22 deletions
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21
cogl.h.in
View File

@ -363,14 +363,29 @@ void cogl_set_fog (const CoglColor *fog_color,
*/
void cogl_disable_fog (void);
/**
* CoglBufferBit:
* @COGL_BUFFER_BIT_COLOR: Selects the primary color buffer
* @COGL_BUFFER_BIT_DEPTH: Selects the depth buffer
* @COGL_BUFFER_BIT_STENCIL: Selects the stencil buffer
*/
typedef enum _CoglBufferBit
{
COGL_BUFFER_BIT_COLOR = 1L<<0,
COGL_BUFFER_BIT_DEPTH = 1L<<1,
COGL_BUFFER_BIT_STENCIL = 1L<<2
} CoglBufferBit;
/**
* cogl_clear:
* @color: Background color to clear to
* @buffers: A mask of @CoglBufferBit<!-- -->'s identifying which auxiliary
* buffers to clear
*
* Clears the color buffer to @color. The depth buffer and stencil
* buffers are also cleared.
* Clears all the auxiliary buffers identified in the @buffers mask, and if
* that includes the color buffer then the specified @color is used.
*/
void cogl_clear (const CoglColor *color);
void cogl_clear (const CoglColor *color, gulong buffers);
/**
* cogl_set_source:

42
common/cogl.c
View File

@ -82,32 +82,36 @@ _cogl_error_string(GLenum errorCode)
#endif
void
cogl_clear (const CoglColor *color)
cogl_clear (const CoglColor *color, gulong buffers)
{
GLbitfield gl_buffers = 0;
#if COGL_DEBUG
fprintf(stderr, "\n ============== Paint Start ================ \n");
#endif
GE( glClearColor (cogl_color_get_red_float (color),
cogl_color_get_green_float (color),
cogl_color_get_blue_float (color),
0.0) );
if (buffers & COGL_BUFFER_BIT_COLOR)
{
GE( glClearColor (cogl_color_get_red_float (color),
cogl_color_get_green_float (color),
cogl_color_get_blue_float (color),
0.0) );
gl_buffers |= GL_COLOR_BUFFER_BIT;
}
if (buffers & COGL_BUFFER_BIT_DEPTH)
gl_buffers |= GL_DEPTH_BUFFER_BIT;
if (buffers & COGL_BUFFER_BIT_STENCIL)
gl_buffers |= GL_STENCIL_BUFFER_BIT;
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
if (!gl_buffers)
{
static gboolean shown = FALSE;
if (!shown)
g_warning ("You should specify at least one auxiliary buffer when calling cogl_clear");
return;
}
/*
* Disable the depth test for now as has some strange side effects,
* mainly on x/y axis rotation with multiple layers at same depth
* (eg rotating text on a bg has very strange effect). Seems no clean
* 100% effective way to fix without other odd issues.. So for now
* move to application to handle and add cogl_enable_depth_test()
* as for custom actors (i.e groups) to enable if need be.
*
* glEnable (GL_DEPTH_TEST);
* glEnable (GL_ALPHA_TEST)
* glDepthFunc (GL_LEQUAL);
* glAlphaFunc (GL_GREATER, 0.1);
*/
glClear (gl_buffers);
}
static inline gboolean