i965_drv_video/shaders/render/exa_wm_yuv_rgb.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:
 *    Keith Packard <keithp@keithp.com>
 *    Eric Anholt <eric@anholt.net>
 *
 */

include(`exa_wm.g4i')

define(`YCbCr_base',	`src_sample_base')

define(`Cr',		`src_sample_r')
define(`Cr_01',		`src_sample_r_01')
define(`Cr_23',		`src_sample_r_23')

define(`Y',		`src_sample_g')
define(`Y_01',		`src_sample_g_01')
define(`Y_23',		`src_sample_g_23')

define(`Cb',		`src_sample_b')
define(`Cb_01',		`src_sample_b_01')
define(`Cb_23',		`src_sample_b_23')

define(`Crn',		`mask_sample_r')
define(`Crn_01',	`mask_sample_r_01')
define(`Crn_23',	`mask_sample_r_23')

define(`Yn',		`mask_sample_g')
define(`Yn_01',		`mask_sample_g_01')
define(`Yn_23',		`mask_sample_g_23')

define(`Cbn',		`mask_sample_b')
define(`Cbn_01',	`mask_sample_b_01')
define(`Cbn_23',	`mask_sample_b_23')

    /* color space conversion function:
     * R = Clamp ( 1.164(Y-16/255) + 1.596(Cr-128/255), 0, 1)
     * G = Clamp ( 1.164(Y-16/255) - 0.813(Cr-128/255) - 0.392(Cb-128/255), 0, 1)
     * B = Clamp ( 1.164(Y-16/255) + 2.017(Cb-128/255), 0, 1)
     */

    /* Normalize Y, Cb and Cr:
     *
     * Yn = (Y - 16/255) * 1.164
     * Crn = Cr - 128 / 255
     * Cbn = Cb - 128 / 255
     */
add (16)    Yn<1>F		Y<8,8,1>F	-0.0627451F { compr align1 };
mul (16)    Yn<1>F		Yn<8,8,1>F	1.164F	    { compr align1 };

add (16)    Crn<1>F		Cr<8,8,1>F	-0.501961F  { compr align1 };

add (16)    Cbn<1>F		Cb<8,8,1>F	-0.501961F  { compr align1 };

    /* 
     * R = Y + Cr * 1.596
     */
mov (16)    acc0<1>F		Yn<8,8,1>F		    { compr align1 };
mac.sat(16) src_sample_r<1>F	Crn<8,8,1>F	1.596F	    { compr align1 };
     
    /*
     * G = Crn * -0.813 + Cbn * -0.392 + Y
     */
mov (16)    acc0<1>F		Yn<8,8,1>F		    { compr align1 };
mac (16)    acc0<1>F		Crn<8,8,1>F    	-0.813F	    { compr align1 };
mac.sat(16) src_sample_g<1>F	Cbn<8,8,1>F    	-0.392F	    { compr align1 };

    /*
     * B = Cbn * 2.017 + Y
     */
mov (16)    acc0<1>F	        Yn<8,8,1>F		    { compr align1 };
mac.sat(16) src_sample_b<1>F	Cbn<8,8,1>F     2.017F	    { compr align1 };

    /*
     * A = 1.0
     */
//mov (16)    src_sample_a<1>F	1.0F			    { compr align1 };