Initial revision

1 files changed, 227 insertions, 0 deletions

diff --git a/src/mesa/main/rastpos.c b/src/mesa/main/rastpos.c
new file mode 100644
index 0000000000..000af375ba
--- /dev/null
+++ b/src/mesa/main/rastpos.c
@@ -0,0 +1,227 @@
+/* $Id: rastpos.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * 
+ * Copyright (C) 1999  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
+ * BRIAN PAUL 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.
+ */
+
+
+
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include "clip.h"
+#include "feedback.h"
+#include "light.h"
+#include "macros.h"
+#include "matrix.h"
+#include "mmath.h"
+#include "shade.h"
+#include "types.h"
+#include "xform.h"
+#include "context.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+
+/*
+ * Caller:  context->API.RasterPos4f
+ */
+void gl_RasterPos4f( GLcontext *ctx,
+                     GLfloat x, GLfloat y, GLfloat z, GLfloat w )
+{
+   GLfloat v[4], eye[4], clip[4], ndc[3], d;
+
+   /* KW: Added this test, which is in the spec.  We can't do this
+    *     outside begin/end any more because the ctx->Current values
+    *     aren't uptodate during that period. 
+    */
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glRasterPos" );
+
+   if (ctx->NewState)
+      gl_update_state( ctx );
+
+   ASSIGN_4V( v, x, y, z, w );
+   TRANSFORM_POINT( eye, ctx->ModelView.m, v );
+
+   /* raster color */
+   if (ctx->Light.Enabled) 
+   {
+      /*GLfloat *vert;*/
+      GLfloat *norm, eyenorm[3];
+      GLfloat *objnorm = ctx->Current.Normal;
+
+	  /* Not needed???
+      vert = (ctx->NeedEyeCoords ? eye : v);
+	  */
+
+      if (ctx->NeedEyeNormals) {
+	 GLfloat *inv = ctx->ModelView.inv;
+	 TRANSFORM_NORMAL( eyenorm, objnorm, inv );
+	 norm = eyenorm;
+      } else {
+	 norm = objnorm;
+      }
+
+      gl_shade_rastpos( ctx, v, norm, 
+			ctx->Current.RasterColor,
+			&ctx->Current.RasterIndex );
+
+   }
+   else {
+      /* use current color or index */
+      if (ctx->Visual->RGBAflag) {
+	 UBYTE_RGBA_TO_FLOAT_RGBA(ctx->Current.RasterColor, 
+				  ctx->Current.ByteColor);
+      }
+      else {
+	 ctx->Current.RasterIndex = ctx->Current.Index;
+      }
+   }
+
+   /* compute raster distance */
+   ctx->Current.RasterDistance =
+                      GL_SQRT( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
+
+   /* apply projection matrix:  clip = Proj * eye */
+   TRANSFORM_POINT( clip, ctx->ProjectionMatrix.m, eye );
+
+   /* clip to view volume */
+   if (gl_viewclip_point( clip )==0) {
+      ctx->Current.RasterPosValid = GL_FALSE;
+      return;
+   }
+
+   /* clip to user clipping planes */
+   if ( ctx->Transform.AnyClip &&
+	gl_userclip_point(ctx, clip) == 0) 
+   {
+      ctx->Current.RasterPosValid = GL_FALSE;
+      return;
+   }
+
+   /* ndc = clip / W */
+   ASSERT( clip[3]!=0.0 );
+   d = 1.0F / clip[3];
+   ndc[0] = clip[0] * d;
+   ndc[1] = clip[1] * d;
+   ndc[2] = clip[2] * d;
+
+   ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport.WindowMap.m[MAT_SX] + 
+				ctx->Viewport.WindowMap.m[MAT_TX]);
+   ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport.WindowMap.m[MAT_SY] + 
+				ctx->Viewport.WindowMap.m[MAT_TY]);
+   ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport.WindowMap.m[MAT_SZ] + 
+				ctx->Viewport.WindowMap.m[MAT_TZ]) / DEPTH_SCALE;
+   ctx->Current.RasterPos[3] = clip[3];
+   ctx->Current.RasterPosValid = GL_TRUE;
+
+   /* FOG??? */
+
+   {
+      GLuint texSet;
+      for (texSet=0; texSet<MAX_TEXTURE_UNITS; texSet++) {
+         COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
+                  ctx->Current.Texcoord[texSet] );
+      }
+   }
+
+   if (ctx->RenderMode==GL_SELECT) {
+      gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
+   }
+
+}
+
+
+
+/*
+ * This is a MESA extension function.  Pretty much just like glRasterPos
+ * except we don't apply the modelview or projection matrices; specify a
+ * window coordinate directly.
+ * Caller:  context->API.WindowPos4fMESA pointer.
+ */
+void gl_windowpos( GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w )
+{
+   /* KW: Assume that like rasterpos, this must be outside begin/end.
+    */
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glWindowPosMESA" );
+
+   /* set raster position */
+   ctx->Current.RasterPos[0] = x;
+   ctx->Current.RasterPos[1] = y;
+   ctx->Current.RasterPos[2] = CLAMP( z, 0.0F, 1.0F );
+   ctx->Current.RasterPos[3] = w;
+
+   ctx->Current.RasterPosValid = GL_TRUE;
+
+   /* raster color */
+   if (0 && ctx->Light.Enabled) {
+
+      /* KW: I don't see how this can work - would have to take the
+       *     inverse of the projection matrix or the combined
+       *     modelProjection matrix, transform point and normal, and
+       *     do the lighting.  Those inverses are not used for
+       *     anything else.  This is not an object-space lighting
+       *     issue - what this is trying to do is something like
+       *     clip-space or window-space lighting...
+       *
+       *     Anyway, since the implementation was never correct, I'm
+       *     not fixing it now - just use the unlit color. 
+       */
+
+      /* KW:  As a reprise, we now *do* keep the inverse of the projection
+       *      matrix, so it is not infeasible to try to swim up stream
+       *      in this manner.  I still don't want to implement it,
+       *      however.
+       */
+   }
+   else {
+      /* use current color or index */
+      if (ctx->Visual->RGBAflag) {
+	 UBYTE_RGBA_TO_FLOAT_RGBA(ctx->Current.RasterColor, 
+				  ctx->Current.ByteColor);
+      }
+      else {
+	 ctx->Current.RasterIndex = ctx->Current.Index;
+      }
+   }
+
+   ctx->Current.RasterDistance = 0.0;
+
+   {
+      GLuint texSet;
+      for (texSet=0; texSet<MAX_TEXTURE_UNITS; texSet++) {
+         COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
+                  ctx->Current.Texcoord[texSet] );
+      }
+   }
+
+   if (ctx->RenderMode==GL_SELECT) {
+      gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
+   }
+}