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/*

 * Mesa 3-D graphics library

 *

 * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.

 *

 * 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 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.

 */

#include "main/glheader.h"

#include "main/context.h"

#include "main/imports.h"

#include "main/macros.h"

#include "s_context.h"

#include "s_logic.h"

#include "s_span.h"

/**

 * We do all logic ops on 4-byte GLuints.

 * Depending on bytes per pixel, the mask array elements correspond to

 * 1, 2 or 4 GLuints.

 */

#define LOGIC_OP_LOOP(MODE, MASKSTRIDE)		\

do {						\

   GLuint i;					\

   switch (MODE) {				\

      case GL_CLEAR:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = 0;			\

	    }					\

	 }					\

	 break;					\

      case GL_SET:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~0;			\

	    }					\

	 }					\

	 break;					\

      case GL_COPY:				\

	 /* do nothing */			\

	 break;					\

      case GL_COPY_INVERTED:			\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~src[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_NOOP:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = dest[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_INVERT:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~dest[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_AND:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] &= dest[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_NAND:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~(src[i] & dest[i]);	\

	    }					\

	 }					\

	 break;					\

      case GL_OR:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] |= dest[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_NOR:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~(src[i] | dest[i]);	\

	    }					\

	 }					\

	 break;					\

      case GL_XOR:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] ^= dest[i];		\

	    }					\

	 }					\

	 break;					\

      case GL_EQUIV:				\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~(src[i] ^ dest[i]);	\

	    }					\

	 }					\

	 break;					\

      case GL_AND_REVERSE:			\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = src[i] & ~dest[i];	\

	    }					\

	 }					\

	 break;					\

      case GL_AND_INVERTED:			\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~src[i] & dest[i];	\

	    }					\

	 }					\

	 break;					\

      case GL_OR_REVERSE:			\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = src[i] | ~dest[i];	\

	    }					\

	 }					\

	 break;					\

      case GL_OR_INVERTED:			\

         for (i = 0; i < n; i++) {		\

	    if (mask[i / MASKSTRIDE]) {		\

	       src[i] = ~src[i] | dest[i];	\

	    }					\

	 }					\

	 break;					\

      default:					\

	 _mesa_problem(ctx, "bad logicop mode");\

   }						\

} while (0)

static inline void

logicop_uint1(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],

              const GLubyte mask[])

{

   LOGIC_OP_LOOP(ctx->Color.LogicOp, 1);

}

static inline void

logicop_uint2(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],

              const GLubyte mask[])

{

   LOGIC_OP_LOOP(ctx->Color.LogicOp, 2);

}

static inline void

logicop_uint4(struct gl_context *ctx, GLuint n, GLuint src[], const GLuint dest[],

              const GLubyte mask[])

{

   LOGIC_OP_LOOP(ctx->Color.LogicOp, 4);

}

/**

 * Apply the current logic operator to a span of RGBA pixels.

 * We can handle horizontal runs of pixels (spans) or arrays of x/y

 * pixel coordinates.

 */

void

_swrast_logicop_rgba_span(struct gl_context *ctx, struct gl_renderbuffer *rb,

                          SWspan *span)

{

   void *rbPixels;

   ASSERT(span->end < SWRAST_MAX_WIDTH);

   ASSERT(span->arrayMask & SPAN_RGBA);

   rbPixels = _swrast_get_dest_rgba(ctx, rb, span);

   if (span->array->ChanType == GL_UNSIGNED_BYTE) {

      /* treat 4*GLubyte as GLuint */

      logicop_uint1(ctx, span->end,

                    (GLuint *) span->array->rgba8,

                    (const GLuint *) rbPixels, span->array->mask);

   }

   else if (span->array->ChanType == GL_UNSIGNED_SHORT) {

      /* treat 2*GLushort as GLuint */

      logicop_uint2(ctx, 2 * span->end,

                    (GLuint *) span->array->rgba16,

                    (const GLuint *) rbPixels, span->array->mask);

   }

   else {

      logicop_uint4(ctx, 4 * span->end,

                    (GLuint *) span->array->attribs[VARYING_SLOT_COL0],

                    (const GLuint *) rbPixels, span->array->mask);

   }

}