i965_drv_video/shaders/render/exa_wm_blend_subpicture.g4a

/*
 * Copyright © 2006 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * Authors:
 *    Wang Zhenyu <zhenyu.z.wang@intel.com>
 *    Keith Packard <keithp@keithp.com>
 */

/* Sample the src surface in planar format */
include(`exa_wm.g4i')

/* prepare sampler read back gX register, which would be written back to output */

/* use simd16 sampler, param 0 is u, param 1 is v. */
/* 'payload' loading, assuming tex coord start from g4 */

/* load r */
mov (1) g0.8<1>UD	0x0000e000UD { align1 mask_disable };

/* src_msg will be copied with g0, as it contains send desc */
/* emit sampler 'send' cmd */


/* sample Y */
send (16) src_msg_ind		/* msg reg index */
	src_sample_g<1>UW 	/* readback */
	g0<8,8,1>UW		/* copy to msg start reg*/
	sampler (1,0,F)		/* sampler message description, (binding_table,sampler_index,datatype)*/
	mlen 5 rlen 2 {align1};

/* sample U (Cr) */
send (16) src_msg_ind		/* msg reg index */
	src_sample_r<1>UW 	/* readback */
	g0<8,8,1>UW		/* copy to msg start reg*/
	sampler (1,2,F)		/* sampler message description, (binding_table,sampler_index,datatype)
				/* here(src->dst) we should use src_sampler and src_surface */
	mlen 5 rlen 2 { align1 };   /* required message len 5, readback len 8 */
	
/* sample V (Cb) */
send (16) src_msg_ind		/* msg reg index */
	src_sample_b<1>UW 	/* readback */
	g0<8,8,1>UW		/* copy to msg start reg*/
	sampler (1,4,F)		/* sampler message description, (binding_table,sampler_index,datatype)
				/* here(src->dst) we should use src_sampler and src_surface */
	mlen 5 rlen 2 { align1 };   /* required message len 5, readback len 8 */

/*extract alpha value, alpha value stores in one float with color value, because the color value is small,
we can neglect it when doing alpha blend*/
mov (8) src_sample_a<1>F g14<8,8,1>F { align1 };
mov (8) src_sample_a_23<1>F g15<8,8,1>F { align1 };


/*set subtitle color*/
add (8) g14<1>F g14<8,8,1>F 0.5F { align1 };
add (8) g15<1>F g15<8,8,1>F 0.5F { align1 };
add (8) g16<1>F g16<8,8,1>F 0.5F { align1 };
add (8) g17<1>F g17<8,8,1>F 0.5F { align1 };
add (8) g18<1>F g18<8,8,1>F 0.5F { align1 };
add (8) g19<1>F g19<8,8,1>F 0.5F { align1 };

nop;
nop;
nop;