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gl: Switch src alpha handling to a tiny on/off function

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Instead of doing setup every time, we just set this one flag. Much
nicer.
This commit is contained in:
Benjamin Otte 2010-05-26 17:41:01 +02:00
parent 53fd451f85
commit b2d709b5c7
1 changed files with 7 additions and 15 deletions
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22
src/cairo-gl-composite.c
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@ -719,27 +719,19 @@ _cairo_gl_set_src_operand (cairo_gl_context_t *ctx,
_cairo_gl_operand_setup_fixed (&setup->src, 0);
}
/* This is like _cairo_gl_set_src_operand, but instead swizzles the source
* for creating the "source alpha" value (src.aaaa * mask.argb) required by
* component alpha rendering.
/* Swizzles the source for creating the "source alpha" value
* (src.aaaa * mask.argb) required by component alpha rendering.
*/
static void
_cairo_gl_set_src_alpha_operand (cairo_gl_context_t *ctx,
cairo_gl_composite_t *setup)
_cairo_gl_set_src_alpha (cairo_gl_context_t *ctx,
cairo_bool_t activate)
{
if (ctx->current_shader)
return;
glActiveTexture (GL_TEXTURE0);
glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
glTexEnvi (GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
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->src, 0);
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
@ -1054,12 +1046,12 @@ _cairo_gl_composite_draw (cairo_gl_context_t *ctx,
_cairo_gl_set_shader (ctx, ctx->pre_shader);
_cairo_gl_set_operator (setup->dst, CAIRO_OPERATOR_DEST_OUT, TRUE);
_cairo_gl_set_src_alpha_operand (ctx, setup);
_cairo_gl_set_src_alpha (ctx, TRUE);
glDrawArrays (GL_TRIANGLES, 0, count);
_cairo_gl_set_src_alpha (ctx, FALSE);
_cairo_gl_set_shader (ctx, prev_shader);
_cairo_gl_set_operator (setup->dst, setup->op, TRUE);
_cairo_gl_set_src_operand (ctx, setup);
glDrawArrays (GL_TRIANGLES, 0, count);
}
}