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  1. /*
  2.  * Mesa 3-D graphics library
  3.  * Version:  7.1
  4.  *
  5.  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  6.  *
  7.  * Permission is hereby granted, free of charge, to any person obtaining a
  8.  * copy of this software and associated documentation files (the "Software"),
  9.  * to deal in the Software without restriction, including without limitation
  10.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11.  * and/or sell copies of the Software, and to permit persons to whom the
  12.  * Software is furnished to do so, subject to the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice shall be included
  15.  * in all copies or substantial portions of the Software.
  16.  *
  17.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20.  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21.  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22.  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25.  
  26. #include "main/glheader.h"
  27. #include "main/context.h"
  28. #include "main/scissor.h"
  29.  
  30.  
  31. /**
  32.  * Called via glScissor
  33.  */
  34. void GLAPIENTRY
  35. _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
  36. {
  37.    GET_CURRENT_CONTEXT(ctx);
  38.    ASSERT_OUTSIDE_BEGIN_END(ctx);
  39.  
  40.    if (MESA_VERBOSE & VERBOSE_API)
  41.       _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
  42.  
  43.    if (width < 0 || height < 0) {
  44.       _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
  45.       return;
  46.    }
  47.  
  48.    _mesa_set_scissor(ctx, x, y, width, height);
  49. }
  50.  
  51.  
  52. /**
  53.  * Define the scissor box.
  54.  *
  55.  * \param x, y coordinates of the scissor box lower-left corner.
  56.  * \param width width of the scissor box.
  57.  * \param height height of the scissor box.
  58.  *
  59.  * \sa glScissor().
  60.  *
  61.  * Verifies the parameters and updates __struct gl_contextRec::Scissor. On a
  62.  * change flushes the vertices and notifies the driver via
  63.  * the dd_function_table::Scissor callback.
  64.  */
  65. void
  66. _mesa_set_scissor(struct gl_context *ctx,
  67.                   GLint x, GLint y, GLsizei width, GLsizei height)
  68. {
  69.    if (x == ctx->Scissor.X &&
  70.        y == ctx->Scissor.Y &&
  71.        width == ctx->Scissor.Width &&
  72.        height == ctx->Scissor.Height)
  73.       return;
  74.  
  75.    FLUSH_VERTICES(ctx, _NEW_SCISSOR);
  76.    ctx->Scissor.X = x;
  77.    ctx->Scissor.Y = y;
  78.    ctx->Scissor.Width = width;
  79.    ctx->Scissor.Height = height;
  80.  
  81.    if (ctx->Driver.Scissor)
  82.       ctx->Driver.Scissor( ctx, x, y, width, height );
  83. }
  84.  
  85.  
  86. /**
  87.  * Initialize the context's scissor state.
  88.  * \param ctx  the GL context.
  89.  */
  90. void
  91. _mesa_init_scissor(struct gl_context *ctx)
  92. {
  93.    /* Scissor group */
  94.    ctx->Scissor.Enabled = GL_FALSE;
  95.    ctx->Scissor.X = 0;
  96.    ctx->Scissor.Y = 0;
  97.    ctx->Scissor.Width = 0;
  98.    ctx->Scissor.Height = 0;
  99. }
  100.