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gl: Simplify mask operand setup code

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Component alpha just has one different value
This commit is contained in:
Benjamin Otte 2010-05-28 12:51:08 +02:00
parent e20261ddda
commit d038003136
1 changed files with 7 additions and 33 deletions
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40
src/cairo-gl-composite.c
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@ -727,36 +727,10 @@ _cairo_gl_set_src_alpha (cairo_gl_context_t *ctx,
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, activate ? GL_SRC_ALPHA : GL_SRC_COLOR);
}
/* This is like _cairo_gl_set_src_alpha_operand, for component alpha setup
* of the mask part of IN to produce a "source alpha" value.
*/
static void
_cairo_gl_set_component_alpha_mask_operand (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup)
{
if (ctx->current_shader)
return;
glActiveTexture (GL_TEXTURE1);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_RGB, GL_PREVIOUS);
glTexEnvi (GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_PREVIOUS);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
_cairo_gl_operand_setup_fixed (&setup->mask, CAIRO_GL_TEX_MASK);
}
static void
_cairo_gl_set_mask_operand (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup)
cairo_gl_composite_t *setup,
cairo_bool_t component_alpha)
{
if (ctx->current_shader)
return;
@ -772,7 +746,10 @@ _cairo_gl_set_mask_operand (cairo_gl_context_t *ctx,
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
if (component_alpha)
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
else
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
glTexEnvi (GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
_cairo_gl_operand_setup_fixed (&setup->mask, CAIRO_GL_TEX_MASK);
@ -1008,10 +985,7 @@ _cairo_gl_composite_begin (cairo_gl_composite_t *setup,
_cairo_gl_context_setup_operand (ctx, CAIRO_GL_TEX_MASK, &setup->mask, dst_size + src_size);
_cairo_gl_set_src_operand (ctx, setup);
if (setup->has_component_alpha)
_cairo_gl_set_component_alpha_mask_operand (ctx, setup);
else
_cairo_gl_set_mask_operand (ctx, setup);
_cairo_gl_set_mask_operand (ctx, setup, setup->has_component_alpha);
cairo_region_destroy (ctx->clip_region);
ctx->clip_region = cairo_region_reference (setup->clip_region);