Fix typo

[mesa.git] / src / mesa / swrast / s_fog.c

diff --git a/src/mesa/swrast/s_fog.c b/src/mesa/swrast/s_fog.c
index 919d70e099d624b3bfd13df915ac563a6d87e338..7c2d519173b32fdd736ee3ce9b4b8e5d1cee1edc 100644 (file)
--- a/src/mesa/swrast/s_fog.c
+++ b/src/mesa/swrast/s_fog.c
@@ -1,4 +1,4 @@
-/* $Id: s_fog.c,v 1.4 2000/12/13 17:35:43 brianp Exp $ */
+/* $Id: s_fog.c,v 1.9 2001/03/03 20:33:30 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -33,6 +33,7 @@
 
 #include "s_context.h"
 #include "s_fog.h"
+#include "s_pb.h"
 
 
 /*
@@ -48,23 +49,35 @@ _mesa_fog_rgba_pixels( const GLcontext *ctx,
                       const GLfixed fog[], 
                       GLchan rgba[][4] )
 {
-   GLfixed rFog = ctx->Fog.Color[0] * CHAN_MAXF;
-   GLfixed gFog = ctx->Fog.Color[1] * CHAN_MAXF;
-   GLfixed bFog = ctx->Fog.Color[2] * CHAN_MAXF;
    GLuint i;
+   GLchan rFog, gFog, bFog;
 
-   for (i=0;i<n;i++) {
-      GLfixed f = CLAMP(fog[i], 0, FIXED_ONE);
-      GLfixed g = FIXED_ONE - f;
-      rgba[i][0] = (f*rgba[i][0] + g*rFog) >> FIXED_SHIFT;
-      rgba[i][1] = (f*rgba[i][1] + g*gFog) >> FIXED_SHIFT;
-      rgba[i][2] = (f*rgba[i][2] + g*bFog) >> FIXED_SHIFT;
+   UNCLAMPED_FLOAT_TO_CHAN(rFog, ctx->Fog.Color[RCOMP]);
+   UNCLAMPED_FLOAT_TO_CHAN(gFog, ctx->Fog.Color[GCOMP]);
+   UNCLAMPED_FLOAT_TO_CHAN(bFog, ctx->Fog.Color[BCOMP]);
+
+#if CHAN_TYPE == GL_FLOAT
+   for (i = 0; i < n; i++) {
+      const GLfixed cf = CLAMP(fog[i], 0, FIXED_ONE);
+      const GLfloat f = FixedToFloat(cf);
+      const GLfloat g = 1.0F - f;
+      rgba[i][RCOMP] = f * rgba[i][RCOMP] + g * rFog;
+      rgba[i][GCOMP] = f * rgba[i][GCOMP] + g * gFog;
+      rgba[i][BCOMP] = f * rgba[i][BCOMP] + g * bFog;
+   }
+#else
+   for (i = 0; i < n; i++) {
+      const GLfixed f = CLAMP(fog[i], 0, FIXED_ONE);
+      const GLfixed g = FIXED_ONE - f;
+      rgba[i][0] = (f * rgba[i][0] + g * rFog) >> FIXED_SHIFT;
+      rgba[i][1] = (f * rgba[i][1] + g * gFog) >> FIXED_SHIFT;
+      rgba[i][2] = (f * rgba[i][2] + g * bFog) >> FIXED_SHIFT;
    }
+#endif
 }
 
 
 
-
 /*
  * Apply fog to an array of color index pixels.
  * Input:  n - number of pixels
@@ -106,9 +119,14 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
    const GLfloat p10 = ctx->ProjectionMatrix.m[10];
    const GLfloat p14 = ctx->ProjectionMatrix.m[14];
    const GLfloat tz = ctx->Viewport._WindowMap.m[MAT_TZ];
-   const GLfloat szInv = 1.0F / ctx->Viewport._WindowMap.m[MAT_SZ];
+   GLfloat szInv;
    GLuint i;
 
+   if (ctx->Viewport._WindowMap.m[MAT_SZ] == 0.0)
+      szInv = 1.0F;
+   else
+      szInv = 1.0F / ctx->Viewport._WindowMap.m[MAT_SZ];
+
    /*
     * Note: to compute eyeZ from the ndcZ we have to solve the following:
     *
@@ -136,14 +154,18 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
       case GL_LINEAR:
          {
             GLfloat fogEnd = ctx->Fog.End;
-            GLfloat fogScale = (GLfloat) FIXED_ONE / (ctx->Fog.End - 
-                                                     ctx->Fog.Start);
+            GLfloat fogScale;
+            if (ctx->Fog.Start == ctx->Fog.End)
+               fogScale = 1.0;
+            else
+               fogScale = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
             if (ortho) {
                for (i=0;i<n;i++) {
                   GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
                   GLfloat eyez = (ndcz - p14) / p10;
-                  if (eyez < 0.0)  eyez = -eyez;
-                  fogcoord[i] = (GLint) ((fogEnd - eyez) * fogScale);
+                  if (eyez < 0.0)
+                     eyez = -eyez;
+                  fogcoord[i] = FloatToFixed((fogEnd - eyez) * fogScale);
                }
             }
             else {
@@ -151,8 +173,9 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
                for (i=0;i<n;i++) {
                   GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
                   GLfloat eyez = p14 / (ndcz + p10);
-                  if (eyez < 0.0)  eyez = -eyez;
-                  fogcoord[i] = (GLint) ((fogEnd - eyez) * fogScale);
+                  if (eyez < 0.0)
+                     eyez = -eyez;
+                  fogcoord[i] = FloatToFixed((fogEnd - eyez) * fogScale);
                }
             }
          }
@@ -162,7 +185,8 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
             for (i=0;i<n;i++) {
                GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
                GLfloat eyez = (ndcz - p14) / p10;
-               if (eyez < 0.0) eyez = -eyez;
+               if (eyez < 0.0)
+                  eyez = -eyez;
                fogcoord[i] = FloatToFixed(exp( -ctx->Fog.Density * eyez ));
             }
          }
@@ -171,7 +195,8 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
             for (i=0;i<n;i++) {
                GLfloat ndcz = ((GLfloat) z[i] - tz) * szInv;
                GLfloat eyez = p14 / (ndcz + p10);
-               if (eyez < 0.0) eyez = -eyez;
+               if (eyez < 0.0)
+                  eyez = -eyez;
                fogcoord[i] = FloatToFixed(exp( -ctx->Fog.Density * eyez ));
             }
          }
@@ -209,7 +234,7 @@ _mesa_win_fog_coords_from_z( const GLcontext *ctx,
          }
         break;
       default:
-         gl_problem(ctx, "Bad fog mode in _mesa_win_fog_coords_from_z");
+         _mesa_problem(ctx, "Bad fog mode in _mesa_win_fog_coords_from_z");
          return;
    }
 }
@@ -226,7 +251,8 @@ void
 _mesa_depth_fog_rgba_pixels( const GLcontext *ctx,
                             GLuint n, const GLdepth z[], GLchan rgba[][4] )
 {
-   GLfixed fog[MAX_WIDTH];
+   GLfixed fog[PB_SIZE];
+   ASSERT(n <= PB_SIZE);
    _mesa_win_fog_coords_from_z( ctx, n, z, fog );
    _mesa_fog_rgba_pixels( ctx, n, fog, rgba );
 }
@@ -243,7 +269,8 @@ void
 _mesa_depth_fog_ci_pixels( const GLcontext *ctx,
                      GLuint n, const GLdepth z[], GLuint index[] )
 {
-   GLfixed fog[MAX_WIDTH];
+   GLfixed fog[PB_SIZE];
+   ASSERT(n <= PB_SIZE);
    _mesa_win_fog_coords_from_z( ctx, n, z, fog );
    _mesa_fog_ci_pixels( ctx, n, fog, index );
 }