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/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2007 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/mtypes.h"
#include "main/scissor.h"
/**
* Set scissor rectangle data directly in ScissorArray
*
* This is an internal function that performs no error checking on the
* supplied data. It also does \b not call \c dd_function_table::Scissor.
*
* \sa _mesa_set_scissor
*/
static void
set_scissor_no_notify(struct gl_context *ctx, unsigned idx,
GLint x, GLint y, GLsizei width, GLsizei height)
{
if (x == ctx->Scissor.ScissorArray[idx].X &&
y == ctx->Scissor.ScissorArray[idx].Y &&
width == ctx->Scissor.ScissorArray[idx].Width &&
height == ctx->Scissor.ScissorArray[idx].Height)
return;
FLUSH_VERTICES(ctx, _NEW_SCISSOR);
ctx->Scissor.ScissorArray[idx].X = x;
ctx->Scissor.ScissorArray[idx].Y = y;
ctx->Scissor.ScissorArray[idx].Width = width;
ctx->Scissor.ScissorArray[idx].Height = height;
}
/**
* Called via glScissor
*/
void GLAPIENTRY
_mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
{
unsigned i;
GET_CURRENT_CONTEXT(ctx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
if (width < 0 || height < 0) {
_mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
return;
}
/* The GL_ARB_viewport_array spec says:
*
* "Scissor sets the scissor rectangle for all viewports to the same
* values and is equivalent (assuming no errors are generated) to:
*
* for (uint i = 0; i < MAX_VIEWPORTS; i++) {
* ScissorIndexed(i, left, bottom, width, height);
* }"
*
* Set the scissor rectangle for all of the viewports supported by the
* implementation, but only signal the driver once at the end.
*/
for (i = 0; i < ctx->Const.MaxViewports; i++)
set_scissor_no_notify(ctx, i, x, y, width, height);
if (ctx->Driver.Scissor)
ctx->Driver.Scissor(ctx);
}
/**
* Define the scissor box.
*
* \param x, y coordinates of the scissor box lower-left corner.
* \param width width of the scissor box.
* \param height height of the scissor box.
*
* \sa glScissor().
*
* Verifies the parameters and updates __struct gl_contextRec::Scissor. On a
* change flushes the vertices and notifies the driver via
* the dd_function_table::Scissor callback.
*/
void
_mesa_set_scissor(struct gl_context *ctx, unsigned idx,
GLint x, GLint y, GLsizei width, GLsizei height)
{
set_scissor_no_notify(ctx, idx, x, y, width, height);
if (ctx->Driver.Scissor)
ctx->Driver.Scissor(ctx);
}
/**
* Initialize the context's scissor state.
* \param ctx the GL context.
*/
void
_mesa_init_scissor(struct gl_context *ctx)
{
unsigned i;
/* Scissor group */
ctx->Scissor.EnableFlags = 0;
/* Note: ctx->Const.MaxViewports may not have been set by the driver yet,
* so just initialize all of them.
*/
for (i = 0; i < MAX_VIEWPORTS; i++)
set_scissor_no_notify(ctx, i, 0, 0, 0, 0);
}
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