From ed30dfa1264ec8875a3162c3c8778bc703bf11d5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 3 Mar 2000 17:47:39 +0000
Subject: runtime selectable depth buffer depth

---
 src/mesa/main/feedback.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

(limited to 'src/mesa/main/feedback.c')

diff --git a/src/mesa/main/feedback.c b/src/mesa/main/feedback.c
index 71c1025d90..3a38db1d62 100644
--- a/src/mesa/main/feedback.c
+++ b/src/mesa/main/feedback.c
@@ -1,4 +1,4 @@
-/* $Id: feedback.c,v 1.8 2000/01/25 16:49:20 brianp Exp $ */
+/* $Id: feedback.c,v 1.9 2000/03/03 17:47:39 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -133,6 +133,7 @@ void gl_feedback_vertex( GLcontext *ctx,
    FEEDBACK_TOKEN( ctx, win[0] );
    FEEDBACK_TOKEN( ctx, win[1] );
    if (ctx->Feedback.Mask & FB_3D) {
+      printf("FB %g\n", win[2]);
       FEEDBACK_TOKEN( ctx, win[2] );
    }
    if (ctx->Feedback.Mask & FB_4D) {
@@ -168,7 +169,7 @@ static void feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 
    win[0] = VB->Win.data[v][0];
    win[1] = VB->Win.data[v][1];
-   win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
+   win[2] = VB->Win.data[v][2] / ctx->Visual->DepthMaxF;
    win[3] = 1.0 / VB->Win.data[v][3];
 
    if (ctx->Light.ShadeModel == GL_SMOOTH)
@@ -299,12 +300,13 @@ void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 void gl_select_triangle( GLcontext *ctx,
 			 GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 {
-   struct vertex_buffer *VB = ctx->VB;
+   const struct vertex_buffer *VB = ctx->VB;
 
    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
-      gl_update_hitflag( ctx, VB->Win.data[v0][2] / DEPTH_SCALE );
-      gl_update_hitflag( ctx, VB->Win.data[v1][2] / DEPTH_SCALE );
-      gl_update_hitflag( ctx, VB->Win.data[v2][2] / DEPTH_SCALE );
+      const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
+      gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
+      gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
+      gl_update_hitflag( ctx, VB->Win.data[v2][2] * zs );
    }
 }
 
@@ -312,21 +314,22 @@ void gl_select_triangle( GLcontext *ctx,
 void gl_select_line( GLcontext *ctx,
 		     GLuint v0, GLuint v1, GLuint pv )
 {
-   struct vertex_buffer *VB = ctx->VB;
-
-   gl_update_hitflag( ctx, VB->Win.data[v0][2] / DEPTH_SCALE );
-   gl_update_hitflag( ctx, VB->Win.data[v1][2] / DEPTH_SCALE );
+   const struct vertex_buffer *VB = ctx->VB;
+   const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
+   gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
+   gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 }
 
 
 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 {
    struct vertex_buffer *VB = ctx->VB;
+   const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
    GLuint i;
 
    for (i=first;i<=last;i++) {
       if (VB->ClipMask[i]==0) {
-         gl_update_hitflag( ctx, VB->Win.data[i][2] / DEPTH_SCALE);
+         gl_update_hitflag( ctx, VB->Win.data[i][2] * zs );
       }
    }
 }
-- 
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