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96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 7.1
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*
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* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <precomp.h>
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/**
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* Called via glScissor
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*/
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void GLAPIENTRY
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_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
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{
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GET_CURRENT_CONTEXT(ctx);
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ASSERT_OUTSIDE_BEGIN_END(ctx);
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if (MESA_VERBOSE & VERBOSE_API)
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_mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
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if (width < 0 || height < 0) {
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_mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
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return;
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}
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_mesa_set_scissor(ctx, x, y, width, height);
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}
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/**
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* Define the scissor box.
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*
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* \param x, y coordinates of the scissor box lower-left corner.
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* \param width width of the scissor box.
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* \param height height of the scissor box.
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*
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* \sa glScissor().
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*
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* Verifies the parameters and updates __struct gl_contextRec::Scissor. On a
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* change flushes the vertices and notifies the driver via
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* the dd_function_table::Scissor callback.
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*/
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void
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_mesa_set_scissor(struct gl_context *ctx,
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GLint x, GLint y, GLsizei width, GLsizei height)
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{
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if (x == ctx->Scissor.X &&
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y == ctx->Scissor.Y &&
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width == ctx->Scissor.Width &&
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height == ctx->Scissor.Height)
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return;
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FLUSH_VERTICES(ctx, _NEW_SCISSOR);
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ctx->Scissor.X = x;
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ctx->Scissor.Y = y;
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ctx->Scissor.Width = width;
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ctx->Scissor.Height = height;
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if (ctx->Driver.Scissor)
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ctx->Driver.Scissor( ctx, x, y, width, height );
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}
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/**
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* Initialize the context's scissor state.
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* \param ctx the GL context.
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*/
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void
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_mesa_init_scissor(struct gl_context *ctx)
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{
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/* Scissor group */
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ctx->Scissor.Enabled = GL_FALSE;
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ctx->Scissor.X = 0;
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ctx->Scissor.Y = 0;
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ctx->Scissor.Width = 0;
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ctx->Scissor.Height = 0;
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}
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