/*
 * Copyright © 2004 David Reveman
 *
 * Permission to use, copy, modify, distribute, and sell this software
 * and its documentation for any purpose is hereby granted without
 * fee, provided that the above copyright notice appear in all copies
 * and that both that copyright notice and this permission notice
 * appear in supporting documentation, and that the name of
 * David Reveman not be used in advertising or publicity pertaining to
 * distribution of the software without specific, written prior permission.
 * David Reveman makes no representations about the suitability of this
 * software for any purpose. It is provided "as is" without express or
 * implied warranty.
 *
 * DAVID REVEMAN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN
 * NO EVENT SHALL DAVID REVEMAN BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
 * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Author: David Reveman <davidr@novell.com>
 */

#ifdef HAVE_CONFIG_H
#  include "../config.h"
#endif

#include "glitzint.h"

static void
_glitz_combine_argb_argb (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);

    op->gl->active_texture (GLITZ_GL_TEXTURE0);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
		       GLITZ_GL_REPLACE);
    op->gl->color_4us (0x0, 0x0, 0x0, 0xffff);

    op->gl->active_texture (GLITZ_GL_TEXTURE1);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
		       GLITZ_GL_COMBINE);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_RGB,
		       GLITZ_GL_MODULATE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_RGB,
		       GLITZ_GL_TEXTURE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_RGB,
		       GLITZ_GL_PREVIOUS);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_RGB,
		       GLITZ_GL_SRC_COLOR);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_RGB,
		       GLITZ_GL_SRC_ALPHA);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_ALPHA,
		       GLITZ_GL_MODULATE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_ALPHA,
		       GLITZ_GL_TEXTURE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_ALPHA,
		       GLITZ_GL_PREVIOUS);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_ALPHA,
		       GLITZ_GL_SRC_ALPHA);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_ALPHA,
		       GLITZ_GL_SRC_ALPHA);
}

static void
_glitz_combine_argb_argbc (glitz_composite_op_t *op)
{
    if (op->count == 0) {
	glitz_set_operator (op->gl, op->render_op);

	op->gl->active_texture (GLITZ_GL_TEXTURE0);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_COMBINE);

	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_RGB,
			   GLITZ_GL_INTERPOLATE);

	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_RGB,
			   GLITZ_GL_TEXTURE);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_RGB,
			   GLITZ_GL_PRIMARY_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE2_RGB,
			   GLITZ_GL_PRIMARY_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_RGB,
			   GLITZ_GL_SRC_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_RGB,
			   GLITZ_GL_SRC_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND2_RGB,
			   GLITZ_GL_SRC_ALPHA);

	/* we don't care about the alpha channel */
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_ALPHA,
			   GLITZ_GL_REPLACE);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_ALPHA,
			   GLITZ_GL_PRIMARY_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_ALPHA,
			   GLITZ_GL_SRC_ALPHA);


	op->gl->active_texture (GLITZ_GL_TEXTURE1);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_COMBINE);

	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_RGB,
			   GLITZ_GL_DOT3_RGBA);

	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_RGB,
			   GLITZ_GL_PREVIOUS);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_RGB,
			   GLITZ_GL_PRIMARY_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_RGB,
			   GLITZ_GL_SRC_COLOR);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_RGB,
			   GLITZ_GL_SRC_COLOR);

	op->gl->active_texture (GLITZ_GL_TEXTURE2);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_MODULATE);
    }

    if (op->alpha_mask.red) {
	op->gl->color_4f (1.0f, 0.5f, 0.5f, 0.5f);
    } else if (op->alpha_mask.green) {
	op->gl->color_4f (0.5f, 1.0f, 0.5f, 0.5f);
    } else if (op->alpha_mask.blue) {
	op->gl->color_4f (0.5f, 0.5f, 1.0f, 0.5f);
    } else {
	op->gl->active_texture (GLITZ_GL_TEXTURE0);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_REPLACE);
	op->gl->color_4us (0x0, 0x0, 0x0, 0xffff);

	op->gl->active_texture (GLITZ_GL_TEXTURE1);
	glitz_texture_unbind (op->gl, &op->src->texture);

	op->gl->active_texture (GLITZ_GL_TEXTURE2);
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_MODULATE);
    }
}

static void
_glitz_combine_argb_argbf (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);
    glitz_filter_enable (op->mask, op);

    op->gl->color_4us (op->alpha_mask.red,
		       op->alpha_mask.green,
		       op->alpha_mask.blue,
		       op->alpha_mask.alpha);
}

static void
_glitz_combine_argb_solid (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);

    if (op->alpha_mask.alpha != 0xffff) {
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_MODULATE);
	op->gl->color_4us (op->alpha_mask.alpha,
			   op->alpha_mask.alpha,
			   op->alpha_mask.alpha,
			   op->alpha_mask.alpha);
    } else {
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_REPLACE);
	op->gl->color_4us (0x0, 0x0, 0x0, 0xffff);
    }
}

static void
_glitz_combine_argb_solidc (glitz_composite_op_t *op)
{
    unsigned short alpha;

    if (op->count == 0)
	glitz_set_operator (op->gl, op->render_op);

    if (op->alpha_mask.red)
	alpha = op->alpha_mask.red;
    else if (op->alpha_mask.green)
	alpha = op->alpha_mask.green;
    else if (op->alpha_mask.blue)
	alpha = op->alpha_mask.blue;
    else
	alpha = op->alpha_mask.alpha;

    if (alpha != 0xffff) {
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_MODULATE);
	op->gl->color_4us (alpha, alpha, alpha, alpha);
    } else {
	op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
			   GLITZ_GL_REPLACE);
	op->gl->color_4us (0x0, 0x0, 0x0, 0xffff);
    }
}

static void
_glitz_combine_argbf_solid (glitz_composite_op_t *op)
{
    if (op->count == 0) {
	glitz_set_operator (op->gl, op->render_op);
	glitz_filter_enable (op->src, op);
    }

    op->gl->color_4us (0x0, 0x0, 0x0, op->alpha_mask.alpha);
}

static void
_glitz_combine_argbf_argbc (glitz_composite_op_t *op)
{
    if (op->count == 0) {
	glitz_set_operator (op->gl, op->render_op);
	glitz_filter_enable (op->src, op);
    }

    op->gl->color_4us (op->alpha_mask.red,
		       op->alpha_mask.green,
		       op->alpha_mask.blue,
		       op->alpha_mask.alpha);
}

static void
_glitz_combine_argbf_solidc (glitz_composite_op_t *op)
{
    unsigned short alpha;

    if (op->count == 0) {
	glitz_set_operator (op->gl, op->render_op);
	glitz_filter_enable (op->src, op);
    }

    if (op->alpha_mask.red)
	alpha = op->alpha_mask.red;
    else if (op->alpha_mask.green)
	alpha = op->alpha_mask.green;
    else if (op->alpha_mask.blue)
	alpha = op->alpha_mask.blue;
    else
	alpha = op->alpha_mask.alpha;

    op->gl->color_4us (0x0, 0x0, 0x0, alpha);
}

static void
_glitz_combine_solid_solid (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);

    op->gl->color_4us (SHORT_MULT (op->solid->red, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->green, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->blue, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->alpha, op->alpha_mask.alpha));
}

static void
_glitz_combine_solid_argb (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
		       GLITZ_GL_COMBINE);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_RGB,
		       GLITZ_GL_MODULATE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_RGB,
		       GLITZ_GL_TEXTURE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_RGB,
		       GLITZ_GL_PRIMARY_COLOR);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_RGB,
		       GLITZ_GL_SRC_ALPHA);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_RGB,
		       GLITZ_GL_SRC_COLOR);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_COMBINE_ALPHA,
		       GLITZ_GL_MODULATE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE0_ALPHA,
		       GLITZ_GL_TEXTURE);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_SOURCE1_ALPHA,
		       GLITZ_GL_PRIMARY_COLOR);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND0_ALPHA,
		       GLITZ_GL_SRC_ALPHA);
    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_OPERAND1_ALPHA,
		       GLITZ_GL_SRC_ALPHA);

    op->gl->color_4us (SHORT_MULT (op->solid->red, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->green, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->blue, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->alpha, op->alpha_mask.alpha));
}

/* This only works with the OVER operator. */
static void
_glitz_combine_solid_argbc (glitz_composite_op_t *op)
{
    glitz_color_t solid;

    solid.red = SHORT_MULT (op->solid->red, op->alpha_mask.alpha);
    solid.green = SHORT_MULT (op->solid->green, op->alpha_mask.alpha);
    solid.blue = SHORT_MULT (op->solid->blue, op->alpha_mask.alpha);
    solid.alpha = SHORT_MULT (op->solid->alpha, op->alpha_mask.alpha);

    op->gl->enable (GLITZ_GL_BLEND);
    op->gl->blend_func (GLITZ_GL_CONSTANT_COLOR, GLITZ_GL_ONE_MINUS_SRC_COLOR);

    if (solid.alpha > 0)
	op->gl->blend_color ((glitz_gl_clampf_t) solid.red / solid.alpha,
			     (glitz_gl_clampf_t) solid.green / solid.alpha,
			     (glitz_gl_clampf_t) solid.blue / solid.alpha,
			     1.0f);
    else
	op->gl->blend_color (1.0f, 1.0f, 1.0f, 1.0f);

    op->gl->tex_env_f (GLITZ_GL_TEXTURE_ENV, GLITZ_GL_TEXTURE_ENV_MODE,
		       GLITZ_GL_MODULATE);
    op->gl->color_4us (solid.alpha,
		       solid.alpha,
		       solid.alpha,
		       solid.alpha);
}

static void
_glitz_combine_solid_argbf (glitz_composite_op_t *op)
{
    glitz_set_operator (op->gl, op->render_op);
    glitz_filter_enable (op->mask, op);

    op->gl->color_4us (SHORT_MULT (op->solid->red, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->green, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->blue, op->alpha_mask.alpha),
		       SHORT_MULT (op->solid->alpha, op->alpha_mask.alpha));
}

/* This only works with the OVER operator. */
static void
_glitz_combine_solid_solidc (glitz_composite_op_t *op)
{
    op->gl->enable (GLITZ_GL_BLEND);
    op->gl->blend_func (GLITZ_GL_CONSTANT_COLOR, GLITZ_GL_ONE_MINUS_SRC_COLOR);

    if (op->solid->alpha > 0)
	op->gl->blend_color ((glitz_gl_clampf_t)
			     op->solid->red / op->solid->alpha,
			     (glitz_gl_clampf_t)
			     op->solid->green / op->solid->alpha,
			     (glitz_gl_clampf_t)
			     op->solid->blue / op->solid->alpha,
			     1.0f);
    else
	op->gl->blend_color (1.0f, 1.0f, 1.0f, 1.0f);

    op->gl->color_4us (SHORT_MULT (op->alpha_mask.red, op->solid->alpha),
		       SHORT_MULT (op->alpha_mask.green, op->solid->alpha),
		       SHORT_MULT (op->alpha_mask.blue, op->solid->alpha),
		       SHORT_MULT (op->alpha_mask.alpha, op->solid->alpha));
}

static glitz_combine_t
_glitz_combine_map[GLITZ_SURFACE_TYPES][GLITZ_SURFACE_TYPES] = {
    {
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 },
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 },
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 },
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 },
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 },
	{ GLITZ_COMBINE_TYPE_NA, NULL, 0, 0 }
    }, {
	{ GLITZ_COMBINE_TYPE_ARGB,        _glitz_combine_argb_solid,  1, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGB,   _glitz_combine_argb_argb,   2, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGBC,  _glitz_combine_argb_argbc,  3, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGBF,  _glitz_combine_argb_argbf,  2, 2 },
	{ GLITZ_COMBINE_TYPE_ARGB_SOLID,  _glitz_combine_argb_solid,  1, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_SOLIDC, _glitz_combine_argb_solidc, 1, 0 }
    }, {
	{ GLITZ_COMBINE_TYPE_ARGB,        _glitz_combine_argb_solid,  1, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGB,   _glitz_combine_argb_argb,   2, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGBC,  _glitz_combine_argb_argbc,  3, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_ARGBF,  _glitz_combine_argb_argbf,  2, 2 },
	{ GLITZ_COMBINE_TYPE_ARGB_SOLID,  _glitz_combine_argb_solid,  1, 0 },
	{ GLITZ_COMBINE_TYPE_ARGB_SOLIDC, _glitz_combine_argb_solidc, 1, 0 }
    }, {
	{ GLITZ_COMBINE_TYPE_ARGBF,        _glitz_combine_argbf_solid,  1, 1 },
	{ GLITZ_COMBINE_TYPE_ARGBF_ARGB,   _glitz_combine_argbf_solid,  2, 1 },
	{ GLITZ_COMBINE_TYPE_ARGBF_ARGBC,  _glitz_combine_argbf_argbc,  2, 1 },
	{ GLITZ_COMBINE_TYPE_NA,           NULL,                        0, 0 },
	{ GLITZ_COMBINE_TYPE_ARGBF_SOLID,  _glitz_combine_argbf_solid,  1, 1 },
	{ GLITZ_COMBINE_TYPE_ARGBF_SOLIDC, _glitz_combine_argbf_solidc, 1, 1 }
    }, {
	{ GLITZ_COMBINE_TYPE_SOLID,        _glitz_combine_solid_solid,  0, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGB,   _glitz_combine_solid_argb,   1, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGBC,  _glitz_combine_solid_argbc,  1, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGBF,  _glitz_combine_solid_argbf,  1, 2 },
	{ GLITZ_COMBINE_TYPE_SOLID_SOLID,  _glitz_combine_solid_solid,  0, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_SOLIDC, _glitz_combine_solid_solidc, 1, 0 }
    }, {
	{ GLITZ_COMBINE_TYPE_SOLID,        _glitz_combine_solid_solid,  0, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGB,   _glitz_combine_solid_argb,   1, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGBC,  _glitz_combine_solid_argbc,  1, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_ARGBF,  _glitz_combine_solid_argbf,  1, 2 },
	{ GLITZ_COMBINE_TYPE_SOLID_SOLID,  _glitz_combine_solid_solid,  0, 0 },
	{ GLITZ_COMBINE_TYPE_SOLID_SOLIDC, _glitz_combine_solid_solidc, 1, 0 }
    }
};

#define SURFACE_WRAP(surface, feature_mask)                             \
    (SURFACE_REPEAT (surface)?                                          \
     (TEXTURE_REPEATABLE (&(surface)->texture) &&                       \
      (                                                                 \
	  (!SURFACE_MIRRORED (surface)) ||                              \
	  ((feature_mask) & GLITZ_FEATURE_TEXTURE_MIRRORED_REPEAT_MASK) \
	  )                                                             \
	 )                                                              \
     :                                                                  \
     ((SURFACE_PAD (surface))?                                          \
      (TEXTURE_PADABLE (&(surface)->texture))                           \
      :                                                                 \
      (TEXTURE_CLAMPABLE (&(surface)->texture) &&                       \
       ((!SURFACE_PROJECTIVE_TRANSFORM (surface)) ||                    \
	((feature_mask) & GLITZ_FEATURE_TEXTURE_BORDER_CLAMP_MASK)      \
	   )                                                            \
	  )                                                             \
	 )                                                              \
	)

static glitz_surface_type_t
_glitz_get_surface_type (glitz_surface_t *surface,
			 unsigned long feature_mask)
{
    if (surface == NULL)
	return GLITZ_SURFACE_TYPE_NULL;

    if (SURFACE_SOLID (surface) &&
	(SURFACE_REPEAT (surface) || SURFACE_PAD (surface))) {
	if (SURFACE_COMPONENT_ALPHA (surface))
	    return GLITZ_SURFACE_TYPE_SOLIDC;
	else
	    return GLITZ_SURFACE_TYPE_SOLID;
    }

    if (SURFACE_WRAP (surface, feature_mask)) {
	if (SURFACE_FRAGMENT_FILTER (surface)) {
	    if (SURFACE_COMPONENT_ALPHA (surface))
		return GLITZ_SURFACE_TYPE_NA;

	    if (feature_mask & GLITZ_FEATURE_FRAGMENT_PROGRAM_MASK)
		return GLITZ_SURFACE_TYPE_ARGBF;

	} else if (SURFACE_COMPONENT_ALPHA (surface)) {
	    return GLITZ_SURFACE_TYPE_ARGBC;
	} else
	    return GLITZ_SURFACE_TYPE_ARGB;
    }

    return GLITZ_SURFACE_TYPE_NA;
}

static glitz_color_t _default_alpha_mask = {
    0xffff, 0xffff, 0xffff, 0xffff
};

void
glitz_composite_op_init (glitz_composite_op_t *op,
			 glitz_operator_t render_op,
			 glitz_surface_t *src,
			 glitz_surface_t *mask,
			 glitz_surface_t *dst)
{
    glitz_surface_type_t src_type;
    glitz_surface_type_t mask_type;
    glitz_combine_t *combine;
    unsigned long feature_mask;

    op->render_op = render_op;
    op->type = GLITZ_COMBINE_TYPE_NA;
    op->combine = NULL;
    op->alpha_mask = _default_alpha_mask;
    op->src = src;
    op->mask = mask;
    op->dst = dst;
    op->count = 0;
    op->solid = NULL;
    op->per_component = 0;
    op->fp = 0;

    if (dst->attached)
    {
	op->gl = dst->attached->backend->gl;
	feature_mask = dst->attached->backend->feature_mask;
    }
    else
    {
	op->gl = dst->drawable->backend->gl;
	feature_mask = dst->drawable->backend->feature_mask;
    }

    src_type = _glitz_get_surface_type (src, feature_mask);
    if (src_type < 1)
	return;

    mask_type = _glitz_get_surface_type (mask, feature_mask);
    if (mask_type < 0)
	return;

    if (src_type == GLITZ_SURFACE_TYPE_SOLIDC)
	src_type = GLITZ_SURFACE_TYPE_SOLID;

    /* We can't do solid IN argbc OP dest, unless OP is OVER.
       But we can do argb IN argbc OP dest, so lets just not use the
       source as a solid color if this is the case. I need to figure out
       a better way to handle special cases like this. */
    if (src_type == GLITZ_SURFACE_TYPE_SOLID &&
	(mask_type == GLITZ_SURFACE_TYPE_SOLIDC ||
	 mask_type == GLITZ_SURFACE_TYPE_ARGBC) &&
	render_op != GLITZ_OPERATOR_OVER)
	src_type = GLITZ_SURFACE_TYPE_ARGB;

    combine = &_glitz_combine_map[src_type][mask_type];
    if (!combine->type)
	return;

    if (dst->geometry.type == GLITZ_GEOMETRY_TYPE_BITMAP)
    {
	/* We can't do anything but solid colors with bitmaps yet. */
	if (src_type != GLITZ_SURFACE_TYPE_SOLID ||
	    (mask_type != GLITZ_SURFACE_TYPE_NULL &&
	     mask_type != GLITZ_SURFACE_TYPE_SOLID))
	    return;
    }

    if (src_type == GLITZ_SURFACE_TYPE_SOLID) {
	if (SURFACE_SOLID_DAMAGE (src)) {
	    glitz_surface_push_current (dst, GLITZ_ANY_CONTEXT_CURRENT);
	    glitz_surface_sync_solid (src);
	    glitz_surface_pop_current (dst);
	}
	op->solid = &src->solid;
	op->src = NULL;
    }

    if (mask_type == GLITZ_SURFACE_TYPE_SOLID) {
	if (SURFACE_SOLID_DAMAGE (mask)) {
	    glitz_surface_push_current (dst, GLITZ_ANY_CONTEXT_CURRENT);
	    glitz_surface_sync_solid (mask);
	    glitz_surface_pop_current (dst);
	}
	op->alpha_mask = mask->solid;
	op->mask = NULL;
	op->combine = combine;
    } else if (mask_type == GLITZ_SURFACE_TYPE_SOLIDC) {
	if (SURFACE_SOLID_DAMAGE (mask)) {
	    glitz_surface_push_current (dst, GLITZ_ANY_CONTEXT_CURRENT);
	    glitz_surface_sync_solid (mask);
	    glitz_surface_pop_current (dst);
	}
	op->alpha_mask = mask->solid;
	op->mask = NULL;

	if (op->src) {
	    op->per_component = 4;
	    op->combine = combine;
	} else if (feature_mask & GLITZ_FEATURE_BLEND_COLOR_MASK)
	    op->combine = combine;

    } else if (mask_type != GLITZ_SURFACE_TYPE_NULL) {
	if (mask_type == GLITZ_SURFACE_TYPE_ARGBC) {
	    if (op->src) {
		/* we can't do component alpha with alpha only surfaces */
		if (op->src->format->color.red_size) {
		    op->per_component = 4;
		    if (feature_mask & GLITZ_FEATURE_TEXTURE_ENV_COMBINE_MASK)
			op->combine = combine;
		}
	    } else if (feature_mask & GLITZ_FEATURE_BLEND_COLOR_MASK)
		op->combine = combine;
	} else if (feature_mask & GLITZ_FEATURE_TEXTURE_ENV_COMBINE_MASK)
	    op->combine = combine;
    } else
	op->combine = combine;

    if (!(feature_mask & GLITZ_FEATURE_MULTITEXTURE_MASK)) {
	if (op->src && op->mask)
	    op->combine = NULL;
    }

    if (op->per_component &&
	(!(feature_mask & GLITZ_FEATURE_PER_COMPONENT_RENDERING_MASK)))
	op->combine = NULL;

    if (op->combine == combine) {
	op->type = combine->type;
	if (combine->source_shader) {
	    if (combine->source_shader == 1)
		op->fp = glitz_filter_get_fragment_program (src, op);
	    else
		op->fp = glitz_filter_get_fragment_program (mask, op);
	    if (op->fp == 0)
		op->type = GLITZ_COMBINE_TYPE_NA;
	}
    }
}

void
glitz_composite_enable (glitz_composite_op_t *op)
{
    op->combine->enable (op);
    op->count++;
}

void
glitz_composite_disable (glitz_composite_op_t *op)
{
    if (op->fp) {
	op->gl->bind_program (GLITZ_GL_FRAGMENT_PROGRAM, 0);
	op->gl->disable (GLITZ_GL_FRAGMENT_PROGRAM);
    }
}