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Flush matrices in the progend and flip with a vector

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Previously flushing the matrices was performed as part of the
framebuffer state. When on GLES2 this matrix flushing is actually
diverted so that it only keeps a reference to the intended matrix
stack. This is necessary because on GLES2 there are no builtin
uniforms so it can't actually flush the matrices until the program for
the pipeline is generated. When the matrices are flushed it would
store the age of modifications on the matrix stack so that it could
detect when the matrix hasn't changed and avoid flushing it.

This patch changes it so that the pipeline is responsible for flushing
the matrices even when we are using the GL builtins. The same
mechanism for detecting unmodified matrix stacks is used in all
cases. There is a new CoglMatrixStackCache type which is used to store
a reference to the intended matrix stack along with its last flushed
age. There are now two of these attached to the CoglContext to track
the flushed state for the global matrix builtins and also two for each
glsl progend program state to track the flushed state for a
program. The framebuffer matrix flush now just updates the intended
matrix stacks without actually trying to flush.

When a vertex snippet is attached to the pipeline, the GLSL vertend
will now avoid using the projection matrix to flip the rendering. This
is necessary because any vertex snippet may cause the projection
matrix not to be used. Instead the flip is done as a forced final step
by multiplying cogl_position_out by a vec4 uniform. This uniform is
updated as part of the progend pre_paint depending on whether the
framebuffer is offscreen or not.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
2011-11-29 14:21:07 +00:00
committed by Robert Bragg
parent 7590fc3ec3
commit f005f517fe
15 changed files with 558 additions and 356 deletions
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26
cogl/cogl-framebuffer.c
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@ -1382,20 +1382,20 @@ static unsigned long
_cogl_framebuffer_compare_modelview_state (CoglFramebuffer *a,
CoglFramebuffer *b)
{
if (!_cogl_matrix_stack_equal (a->modelview_stack, b->modelview_stack))
return COGL_FRAMEBUFFER_STATE_MODELVIEW;
else
return 0;
/* We always want to flush the modelview state. All this does is set
the current modelview stack on the context to the framebuffer's
stack. */
return COGL_FRAMEBUFFER_STATE_MODELVIEW;
}
static unsigned long
_cogl_framebuffer_compare_projection_state (CoglFramebuffer *a,
CoglFramebuffer *b)
{
if (!_cogl_matrix_stack_equal (a->projection_stack, b->projection_stack))
return COGL_FRAMEBUFFER_STATE_MODELVIEW;
else
return 0;
/* We always want to flush the projection state. All this does is
set the current projection stack on the context to the
framebuffer's stack. */
return COGL_FRAMEBUFFER_STATE_PROJECTION;
}
static unsigned long
@ -1533,17 +1533,15 @@ _cogl_framebuffer_flush_dither_state (CoglFramebuffer *framebuffer)
static void
_cogl_framebuffer_flush_modelview_state (CoglFramebuffer *framebuffer)
{
_cogl_matrix_stack_flush_to_gl (framebuffer->context,
framebuffer->modelview_stack,
COGL_MATRIX_MODELVIEW);
_cogl_context_set_current_modelview (framebuffer->context,
framebuffer->modelview_stack);
}
static void
_cogl_framebuffer_flush_projection_state (CoglFramebuffer *framebuffer)
{
_cogl_matrix_stack_flush_to_gl (framebuffer->context,
framebuffer->projection_stack,
COGL_MATRIX_PROJECTION);
_cogl_context_set_current_projection (framebuffer->context,
framebuffer->projection_stack);
}
static void