source: vbox/trunk/src/VBox/GuestHost/OpenGL/state_tracker/state_rasterpos.c@ 76384

/* 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"


/*
 * Apply modelview, projection, viewport transformations to (x,y,z,w)
 * and update the current raster position attributes.
 * Do NOT set dirty state.
 */
void
crStateRasterPosUpdate(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
        CRContext *g = GetCurrentContext();
        CRCurrentState *c = &(g->current);
        CRTransformState *t = &(g->transform);
        CRViewportState *v = &(g->viewport);
        GLvectorf p;
        int i;

        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, "RasterPos called in Begin/End");
                return;
        }

        FLUSH();

        /* update current color, texcoord, etc from the CurrentStatePointers */
        crStateCurrentRecover();

        p.x = x;
        p.y = y;
        p.z = z;
        p.w = w;

        /* Apply modelview and projection matrix */
        crStateTransformXformPoint(t, &p);      

        /* clip test */
        if (p.x >  p.w || p.y >  p.w || p.z > p.w ||
                  p.x < -p.w || p.y < -p.w || p.z < -p.w) 
        {
                c->rasterValid = GL_FALSE;
                return;
        } 

        /* divide by W (perspective projection) */
        p.x /= p.w;
        p.y /= p.w;
        p.z /= p.w;
        p.w = 1.0f;

        /* map from NDC to window coords */
        crStateViewportApply(v, &p);

        c->rasterValid = GL_TRUE;
        ASSIGN_4V(c->rasterAttrib[VERT_ATTRIB_POS],    p.x, p.y, p.z, p.w);
        ASSIGN_4V(c->rasterAttribPre[VERT_ATTRIB_POS], p.x, p.y, p.z, p.w);
        for (i = 1; i < CR_MAX_VERTEX_ATTRIBS; i++) {
                COPY_4V(c->rasterAttrib[i] , c->vertexAttrib[i]);
        }

        /* XXX need to update raster distance... */
        /* from Mesa... */
#ifdef CR_EXT_fog_coord
        if (g->fog.fogCoordinateSource == GL_FOG_COORDINATE_EXT)
                 c->rasterAttrib[VERT_ATTRIB_FOG][0] = c->vertexAttrib[VERT_ATTRIB_FOG][0];
        else
#endif
                 c->rasterAttrib[VERT_ATTRIB_FOG][0] = 0.0; /*(GLfloat)
                                                sqrt( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );*/
}


/* As above, but set dirty flags */
static void RasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
        CRContext *g = GetCurrentContext();
        CRStateBits *sb = GetCurrentBits();
        CRCurrentBits *cb = &(sb->current);

        crStateRasterPosUpdate(x, y, z, w);

        DIRTY(cb->dirty, g->neg_bitid);
        DIRTY(cb->rasterPos, g->neg_bitid);
}

void STATE_APIENTRY crStateRasterPos2d(GLdouble x, GLdouble y)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2f(GLfloat x, GLfloat y)
{
        RasterPos4f(x, y, 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2i(GLint x, GLint y)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2s(GLshort x, GLshort y)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos3d(GLdouble x, GLdouble y, GLdouble z)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0f);
}

void STATE_APIENTRY crStateRasterPos3f(GLfloat x, GLfloat y, GLfloat z)
{
        RasterPos4f(x, y, z, 1.0f);
}

void STATE_APIENTRY crStateRasterPos3i(GLint x, GLint y, GLint z)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0f);
}

void STATE_APIENTRY crStateRasterPos3s(GLshort x, GLshort y, GLshort z)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0f);
}

void STATE_APIENTRY crStateRasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
}

void STATE_APIENTRY crStateRasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
        RasterPos4f(x, y, z, w);
}

void STATE_APIENTRY crStateRasterPos4i(GLint x, GLint y, GLint z, GLint w)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
}

void STATE_APIENTRY crStateRasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w)
{
        RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
}

void STATE_APIENTRY crStateRasterPos2dv(const GLdouble *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2fv(const GLfloat *v)
{
        RasterPos4f(v[0], v[1], 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2iv(const GLint *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos2sv(const GLshort *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], 0.0f, 1.0f);
}

void STATE_APIENTRY crStateRasterPos3dv(const GLdouble *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0f);
}

void STATE_APIENTRY crStateRasterPos3fv(const GLfloat *v)
{
        RasterPos4f(v[0], v[1], v[2], 1.0f);
}

void STATE_APIENTRY crStateRasterPos3iv(const GLint *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0f);
}

void STATE_APIENTRY crStateRasterPos3sv(const GLshort *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0f);
}

void STATE_APIENTRY crStateRasterPos4dv(const GLdouble *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], (GLfloat) v[3]);
}

void STATE_APIENTRY crStateRasterPos4fv(const GLfloat *v)
{
        RasterPos4f(v[0], v[1], v[2], v[3]);
}

void STATE_APIENTRY crStateRasterPos4iv(const GLint *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], (GLfloat) v[3]);
}

void STATE_APIENTRY crStateRasterPos4sv(const GLshort *v)
{
        RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], (GLfloat) v[3]);
}


/**********************************************************************/


static void
crStateWindowPosUpdate(GLfloat x, GLfloat y, GLfloat z)
{
        CRContext *g = GetCurrentContext();
        CRCurrentState *c = &(g->current);
        CRStateBits *sb = GetCurrentBits();
        CRCurrentBits *cb = &(sb->current);
        int i;

        if (g->current.inBeginEnd)
        {
                crStateError(__LINE__, __FILE__, GL_INVALID_OPERATION, "WindowPos called in Begin/End");
                return;
        }

        FLUSH();
        DIRTY(cb->dirty, g->neg_bitid);
        DIRTY(cb->rasterPos, g->neg_bitid);

        c->rasterValid = GL_TRUE;
        ASSIGN_4V(c->rasterAttrib[VERT_ATTRIB_POS],    x, y , z, 1.0);
        ASSIGN_4V(c->rasterAttribPre[VERT_ATTRIB_POS], x, y, z, 1.0);
        for (i = 1; i < CR_MAX_VERTEX_ATTRIBS; i++) {
                COPY_4V(c->rasterAttrib[i] , c->vertexAttrib[i]);
        }
}


void STATE_APIENTRY crStateWindowPos2dARB (GLdouble x, GLdouble y)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, 0.0);
}

void STATE_APIENTRY crStateWindowPos2dvARB (const GLdouble *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], 0.0);
}

void STATE_APIENTRY crStateWindowPos2fARB (GLfloat x, GLfloat y)
{
        crStateWindowPosUpdate(x, y, 0.0);
}

void STATE_APIENTRY crStateWindowPos2fvARB (const GLfloat *v)
{
        crStateWindowPosUpdate(v[0], v[1], 0.0);
}

void STATE_APIENTRY crStateWindowPos2iARB (GLint x, GLint y)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, 0.0);
}

void STATE_APIENTRY crStateWindowPos2ivARB (const GLint *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], 0.0);
}

void STATE_APIENTRY crStateWindowPos2sARB (GLshort x, GLshort y)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, 0.0);
}

void STATE_APIENTRY crStateWindowPos2svARB (const GLshort *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], 0.0);
}

void STATE_APIENTRY crStateWindowPos3dARB (GLdouble x, GLdouble y, GLdouble z)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, (GLfloat) z);
}

void STATE_APIENTRY crStateWindowPos3dvARB (const GLdouble *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2]);
}

void STATE_APIENTRY crStateWindowPos3fARB (GLfloat x, GLfloat y, GLfloat z)
{
        crStateWindowPosUpdate(x, y, z);
}

void STATE_APIENTRY crStateWindowPos3fvARB (const GLfloat *v)
{
        crStateWindowPosUpdate(v[0], v[1], v[2]);
}

void STATE_APIENTRY crStateWindowPos3iARB (GLint x, GLint y, GLint z)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, (GLfloat) z);
}

void STATE_APIENTRY crStateWindowPos3ivARB (const GLint *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2]);
}

void STATE_APIENTRY crStateWindowPos3sARB (GLshort x, GLshort y, GLshort z)
{
        crStateWindowPosUpdate((GLfloat) x, (GLfloat) y, (GLfloat) z);
}

void STATE_APIENTRY crStateWindowPos3svARB (const GLshort *v)
{
        crStateWindowPosUpdate((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2]);
}