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Rename _mesa_update_buffers() to _mesa_update_draw_buffer_bounds() and do

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additional checks.
Replace _mesa_init_buffers() with _mesa_init_scissor() and _mesa_init_multisample().
This commit is contained in:
Brian Paul
2005-02-26 17:16:12 +00:00
parent 4932ba28ad
commit 67742383e8
4 changed files with 67 additions and 43 deletions
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78
src/mesa/main/buffers.c
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@@ -5,9 +5,9 @@
/*
* Mesa 3-D graphics library
* Version: 6.1
* Version: 6.3
*
* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
* Copyright (C) 1999-2005 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"),
@@ -645,51 +645,62 @@ _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
/** \name State management */
/*@{*/
/**
* Update screen bounds.
*
* \param ctx GL context.
*
* Update gl_frame_buffer::_Xmin, and etc.
* Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
* These values are computed from the buffer's width and height and
* the scissor box, if it's enabled.
* \param ctx the GL context.
*/
void _mesa_update_buffers( GLcontext *ctx )
void
_mesa_update_draw_buffer_bounds(GLcontext *ctx)
{
ctx->DrawBuffer->_Xmin = 0;
ctx->DrawBuffer->_Ymin = 0;
ctx->DrawBuffer->_Xmax = ctx->DrawBuffer->Width;
ctx->DrawBuffer->_Ymax = ctx->DrawBuffer->Height;
GLframebuffer *buffer = ctx->DrawBuffer;
buffer->_Xmin = 0;
buffer->_Ymin = 0;
buffer->_Xmax = buffer->Width;
buffer->_Ymax = buffer->Height;
if (ctx->Scissor.Enabled) {
if (ctx->Scissor.X > ctx->DrawBuffer->_Xmin) {
ctx->DrawBuffer->_Xmin = ctx->Scissor.X;
if (ctx->Scissor.X > buffer->_Xmin) {
buffer->_Xmin = ctx->Scissor.X;
}
if (ctx->Scissor.Y > ctx->DrawBuffer->_Ymin) {
ctx->DrawBuffer->_Ymin = ctx->Scissor.Y;
if (ctx->Scissor.Y > buffer->_Ymin) {
buffer->_Ymin = ctx->Scissor.Y;
}
if (ctx->Scissor.X + ctx->Scissor.Width < ctx->DrawBuffer->_Xmax) {
ctx->DrawBuffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width;
if (ctx->Scissor.X + ctx->Scissor.Width < buffer->_Xmax) {
buffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width;
}
if (ctx->Scissor.Y + ctx->Scissor.Height < ctx->DrawBuffer->_Ymax) {
ctx->DrawBuffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height;
if (ctx->Scissor.Y + ctx->Scissor.Height < buffer->_Ymax) {
buffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height;
}
/* finally, check for empty region */
if (buffer->_Xmin > buffer->_Xmax) {
buffer->_Xmin = buffer->_Xmax;
}
if (buffer->_Ymin > buffer->_Ymax) {
buffer->_Ymin = buffer->_Ymax;
}
}
ASSERT(buffer->_Xmin <= buffer->_Xmax);
ASSERT(buffer->_Ymin <= buffer->_Ymax);
}
/*@}*/
/**********************************************************************/
/** \name Initialization */
/*@{*/
/**
* Initialize the context scissor data.
*
* \param ctx GL context.
*
* Initializes the __GLcontextRec::Scissor and __GLcontextRec::Multisample
* attribute groups, and related constants in __GLcontextRec::Const.
* Initialize the context's scissor state.
* \param ctx the GL context.
*/
void _mesa_init_buffers( GLcontext * ctx )
void
_mesa_init_scissor(GLcontext *ctx)
{
/* Scissor group */
ctx->Scissor.Enabled = GL_FALSE;
@@ -697,15 +708,22 @@ void _mesa_init_buffers( GLcontext * ctx )
ctx->Scissor.Y = 0;
ctx->Scissor.Width = 0;
ctx->Scissor.Height = 0;
}
/* Multisample */
/**
* Initialize the context's multisample state.
* \param ctx the GL context.
*/
void
_mesa_init_multisample(GLcontext *ctx)
{
ctx->Multisample.Enabled = GL_FALSE;
ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
ctx->Multisample.SampleAlphaToOne = GL_FALSE;
ctx->Multisample.SampleCoverage = GL_FALSE;
ctx->Multisample.SampleCoverageValue = 1.0;
ctx->Multisample.SampleCoverageInvert = GL_FALSE;
}
/*@}*/