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* clutter/cogl/gl(es)/cogl.c: New internal function

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cogl_blend_func caches blending setup much like cogl_enable
	does with the enable flags. This separates blending factors
	setup from the enable/disable operation in preparation of
	the texture image retrieval fix for alpha channel on GLES.
	(cogl_enable:) Does not modify blending factors anymore.

	* clutter/cogl/gl(es)/cogl-context.h: CoglContext holds two
	new variables to cache blending src and dst factors.

	* clutter/cogl/gl(es)/cogl-context.c:
	(cogl_create_context:) Initialize blending factors.

	* clutter/cogl/gles/cogl-texture.c:
	(cogl_texture_download_from_gl:) Set blending factors to
	CGL_ONE, CGL_ZERO which fixes the slighlty improper behavior
	where source colour was actually multiplied with its alpha
	value in the result (not noticable on current tests).
This commit is contained in:
Ivan Leben 2008-05-19 15:02:27 +00:00
parent ae444ad679
commit d049d9ead4
7 changed files with 51 additions and 62 deletions
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8
gl/cogl-context.c
View file

@ -61,6 +61,9 @@ cogl_create_context ()
_context->fbo_handles = NULL;
_context->draw_buffer = COGL_WINDOW_BUFFER;
_context->blend_src_factor = CGL_SRC_ALPHA;
_context->blend_dst_factor = CGL_ONE_MINUS_SRC_ALPHA;
_context->shader_handles = NULL;
_context->program_handles = NULL;
@ -91,8 +94,9 @@ cogl_create_context ()
_context->pf_glUniform1fARB = NULL;
/* Init OpenGL state */
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColorMask (TRUE, TRUE, TRUE, FALSE);
GE( glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE) );
GE( glColorMask (TRUE, TRUE, TRUE, FALSE) );
GE( glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) );
cogl_enable (0);
return TRUE;

2
gl/cogl-context.h
View file

@ -37,6 +37,8 @@ typedef struct
/* Enable cache */
gulong enable_flags;
guint8 color_alpha;
COGLenum blend_src_factor;
COGLenum blend_dst_factor;
/* Primitives */
CoglFixedVec2 path_start;

65
gl/cogl.c
View file

@ -306,12 +306,9 @@ cogl_enable (gulong flags)
*/
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (cogl_toggle_flag (ctx, flags,
COGL_ENABLE_BLEND,
GL_BLEND))
{
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
cogl_toggle_flag (ctx, flags,
COGL_ENABLE_BLEND,
GL_BLEND);
cogl_toggle_flag (ctx, flags,
COGL_ENABLE_TEXTURE_2D,
@ -340,59 +337,23 @@ cogl_get_enable ()
return ctx->enable_flags;
}
/*
void
cogl_enable (gulong flags)
cogl_blend_func (COGLenum src_factor, COGLenum dst_factor)
{
/* This function caches the blending setup in the
* hope of lessening GL traffic.
*/
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (flags & COGL_ENABLE_BLEND)
if (ctx->blend_src_factor != src_factor ||
ctx->blend_dst_factor != dst_factor)
{
if (!(ctx->enable_flags & COGL_ENABLE_BLEND))
{
glEnable (GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
ctx->enable_flags |= COGL_ENABLE_BLEND;
}
glBlendFunc (src_factor, dst_factor);
ctx->blend_src_factor = src_factor;
ctx->blend_dst_factor = dst_factor;
}
else if (ctx->enable_flags & COGL_ENABLE_BLEND)
{
glDisable (GL_BLEND);
ctx->enable_flags &= ~COGL_ENABLE_BLEND;
}
if (flags & COGL_ENABLE_TEXTURE_2D)
{
if (!(ctx->enable_flags & COGL_ENABLE_TEXTURE_2D))
{
glEnable (GL_TEXTURE_2D);
ctx->enable_flags |= COGL_ENABLE_TEXTURE_2D;
}
}
else if (ctx->enable_flags & COGL_ENABLE_TEXTURE_2D)
{
glDisable (GL_TEXTURE_2D);
ctx->enable_flags &= ~COGL_ENABLE_TEXTURE_2D;
}
#ifdef GL_TEXTURE_RECTANGLE_ARB
if (flags & COGL_ENABLE_TEXTURE_RECT)
{
if (!(ctx->enable_flags & COGL_ENABLE_TEXTURE_RECT))
{
glEnable (GL_TEXTURE_RECTANGLE_ARB);
ctx->enable_flags |= COGL_ENABLE_TEXTURE_RECT;
}
}
else if (ctx->enable_flags & COGL_ENABLE_TEXTURE_RECT)
{
glDisable (GL_TEXTURE_RECTANGLE_ARB);
ctx->enable_flags &= ~COGL_ENABLE_TEXTURE_RECT;
}
#endif
}
*/
void
cogl_enable_depth_test (gboolean setting)
{

8
gles/cogl-context.c
View file

@ -65,9 +65,13 @@ cogl_create_context ()
_context->fbo_handles = NULL;
_context->draw_buffer = COGL_WINDOW_BUFFER;
_context->blend_src_factor = CGL_SRC_ALPHA;
_context->blend_dst_factor = CGL_ONE_MINUS_SRC_ALPHA;
/* Init OpenGL state */
glTexEnvx (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glColorMask (TRUE, TRUE, TRUE, FALSE);
GE( glTexEnvx (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE) );
GE( glColorMask (TRUE, TRUE, TRUE, FALSE) );
GE( glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) );
cogl_enable (0);
return TRUE;

2
gles/cogl-context.h
View file

@ -44,6 +44,8 @@ typedef struct
/* Enable cache */
gulong enable_flags;
guint8 color_alpha;
COGLenum blend_src_factor;
COGLenum blend_dst_factor;
/* Primitives */
CoglFixedVec2 path_start;

2
gles/cogl-texture.c
View file

@ -297,6 +297,7 @@ _cogl_texture_download_from_gl (CoglTexture *tex,
for direct copy to framebuffer */
cogl_paint_init (&cback);
cogl_color (&cwhite);
cogl_blend_func (CGL_ONE, CGL_ZERO);
/* Draw the texture image */
cogl_texture_rectangle (handle,
@ -349,6 +350,7 @@ _cogl_texture_download_from_gl (CoglTexture *tex,
for direct copy to framebuffer */
cogl_paint_init (&cback);
cogl_color (&cwhite);
cogl_blend_func (CGL_ONE, CGL_ZERO);
/* Draw a portion of texture */
cogl_texture_rectangle (handle,

26
gles/cogl.c
View file

@ -214,12 +214,9 @@ cogl_enable (gulong flags)
*/
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (cogl_toggle_flag (ctx, flags,
COGL_ENABLE_BLEND,
GL_BLEND))
{
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
cogl_toggle_flag (ctx, flags,
COGL_ENABLE_BLEND,
GL_BLEND);
cogl_toggle_flag (ctx, flags,
COGL_ENABLE_TEXTURE_2D,
@ -246,6 +243,23 @@ cogl_get_enable ()
return ctx->enable_flags;
}
void
cogl_blend_func (COGLenum src_factor, COGLenum dst_factor)
{
/* This function caches the blending setup in the
* hope of lessening GL traffic.
*/
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (ctx->blend_src_factor != src_factor ||
ctx->blend_dst_factor != dst_factor)
{
glBlendFunc (src_factor, dst_factor);
ctx->blend_src_factor = src_factor;
ctx->blend_dst_factor = dst_factor;
}
}
void
cogl_enable_depth_test (gboolean setting)
{