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/* Copyright (c) 2001, Stanford University
* All rights reserved
*
* See the file LICENSE.txt for information on redistributing this software.
*/
#include <stdio.h>
#include "state.h"
#include "state/cr_statetypes.h"
#include "state_internals.h"
void crStateViewportInit(CRContext *ctx)
{
CRViewportState *v = &ctx->viewport;
CRStateBits *sb = GetCurrentBits();
CRViewportBits *vb = &(sb->viewport);
CRTransformBits *tb = &(sb->transform);
v->scissorTest = GL_FALSE;
RESET(vb->enable, ctx->bitid);
v->viewportValid = GL_FALSE;
v->viewportX = 0;
v->viewportY = 0;
/* These are defaults, the tilesort spu overrides when
* the context has been created */
v->viewportW = 640;
v->viewportH = 480;
RESET(vb->v_dims, ctx->bitid);
v->scissorValid = GL_FALSE;
v->scissorX = 0;
v->scissorY = 0;
/* These are defaults, the tilesort spu overrides when
* the context has been created */
v->scissorW = 640;
v->scissorH = 480;
RESET(vb->s_dims, ctx->bitid);
v->farClip = 1.0;
v->nearClip = 0.0;
RESET(vb->depth, ctx->bitid);
RESET(vb->dirty, ctx->bitid);
/* XXX why are these here? */
RESET(tb->base, ctx->bitid);
RESET(tb->dirty, ctx->bitid);
}
void crStateViewportApply(CRViewportState *v, GLvectorf *p)
{
p->x = (p->x+1.0f)*(v->viewportW / 2.0f) + v->viewportX;
p->y = (p->y+1.0f)*(v->viewportH / 2.0f) + v->viewportY;
p->z = (GLfloat) ((p->z+1.0f)*((v->farClip - v->nearClip) / 2.0f) + v->nearClip);
}
void STATE_APIENTRY crStateViewport(GLint x, GLint y, GLsizei width,
GLsizei height)
{
CRContext *g = GetCurrentContext();
CRViewportState *v = &(g->viewport);
CRStateBits *sb = GetCurrentBits();
CRViewportBits *vb = &(sb->viewport);
CRTransformBits *tb = &(sb->transform);
if (g->current.inBeginEnd)
{
crStateError( __LINE__, __FILE__, GL_INVALID_OPERATION,
"calling glViewport() between glBegin/glEnd" );
return;
}
FLUSH();
if (width < 0 || height < 0)
{
crStateError( __LINE__, __FILE__, GL_INVALID_VALUE,
"glViewport(bad width or height)" );
return;
}
if (x > g->limits.maxViewportDims[0]) x = g->limits.maxViewportDims[0];
if (x < -g->limits.maxViewportDims[0]) x = -g->limits.maxViewportDims[0];
if (y > g->limits.maxViewportDims[1]) y = g->limits.maxViewportDims[1];
if (y < -g->limits.maxViewportDims[1]) y = -g->limits.maxViewportDims[1];
if (width > g->limits.maxViewportDims[0]) width = g->limits.maxViewportDims[0];
if (height > g->limits.maxViewportDims[1]) height = g->limits.maxViewportDims[1];
v->viewportX = (GLint) (x);
v->viewportY = (GLint) (y);
v->viewportW = (GLint) (width);
v->viewportH = (GLint) (height);
v->viewportValid = GL_TRUE;
DIRTY(vb->v_dims, g->neg_bitid);
DIRTY(vb->dirty, g->neg_bitid);
/* XXX why are these here? */
DIRTY(tb->base, g->neg_bitid);
DIRTY(tb->dirty, g->neg_bitid);
}
void STATE_APIENTRY crStateDepthRange(GLclampd znear, GLclampd zfar)
{
CRContext *g = GetCurrentContext();
CRViewportState *v = &(g->viewport);
CRStateBits *sb = GetCurrentBits();
CRViewportBits *vb = &(sb->viewport);
CRTransformBits *tb = &(sb->transform);
if (g->current.inBeginEnd)
{
crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, "glDepthRange called in Begin/End");
return;
}
FLUSH();
v->nearClip = znear;
v->farClip = zfar;
if (v->nearClip < 0.0) v->nearClip = 0.0;
if (v->nearClip > 1.0) v->nearClip = 1.0;
if (v->farClip < 0.0) v->farClip = 0.0;
if (v->farClip > 1.0) v->farClip = 1.0;
DIRTY(vb->depth, g->neg_bitid);
DIRTY(vb->dirty, g->neg_bitid);
DIRTY(tb->dirty, g->neg_bitid);
}
void STATE_APIENTRY crStateScissor (GLint x, GLint y,
GLsizei width, GLsizei height)
{
CRContext *g = GetCurrentContext();
CRViewportState *v = &(g->viewport);
CRStateBits *sb = GetCurrentBits();
CRViewportBits *vb = &(sb->viewport);
if (g->current.inBeginEnd)
{
crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION,
"glScissor called in begin/end");
return;
}
FLUSH();
if (width < 0 || height < 0)
{
crStateError(__LINE__, __FILE__, GL_INVALID_VALUE,
"glScissor called with negative width/height: %d,%d",
width, height);
return;
}
v->scissorX = (GLint) (x);
v->scissorY = (GLint) (y);
v->scissorW = (GLint) (width);
v->scissorH = (GLint) (height);
v->scissorValid = GL_TRUE;
DIRTY(vb->s_dims, g->neg_bitid);
DIRTY(vb->dirty, g->neg_bitid);
}
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