Changed a number of context fields from GLchan to GLfloat (such as ClearColor).

Also changed parameter types for some driver functions (like ctx->Driver.Clear-
Color).  Updated all the device drivers.
Someday, we want to support 8, 16 and 32-bit channels dynamically at runtime.

4 files changed, 58 insertions, 54 deletions

diff --git a/src/mesa/swrast/s_alpha.c b/src/mesa/swrast/s_alpha.c
index 79e27d5755e..5cbfe8617a5 100644
--- a/src/mesa/swrast/s_alpha.c
+++ b/src/mesa/swrast/s_alpha.c
@@ -1,4 +1,4 @@
-/* $Id: s_alpha.c,v 1.11 2002/08/07 00:45:07 brianp Exp $ */
+/* $Id: s_alpha.c,v 1.12 2002/10/04 19:10:12 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -50,11 +50,13 @@ GLint
 _mesa_alpha_test( const GLcontext *ctx, struct sw_span *span )
 {
    const GLchan (*rgba)[4] = (const GLchan (*)[4]) span->array->rgba;
-   const GLchan ref = ctx->Color.AlphaRef;
+   GLchan ref;
    const GLuint n = span->end;
    GLubyte *mask = span->array->mask;
    GLuint i;
 
+   CLAMPED_FLOAT_TO_CHAN(ref, ctx->Color.AlphaRef);
+
    if (span->arrayMask & SPAN_RGBA) {
       /* Use the array values */
       switch (ctx->Color.AlphaFunc) {
diff --git a/src/mesa/swrast/s_alphabuf.c b/src/mesa/swrast/s_alphabuf.c
index b303c0fc76c..2eab878a23a 100644
--- a/src/mesa/swrast/s_alphabuf.c
+++ b/src/mesa/swrast/s_alphabuf.c
@@ -1,8 +1,8 @@
-/* $Id: s_alphabuf.c,v 1.11 2002/07/09 01:22:52 brianp Exp $ */
+/* $Id: s_alphabuf.c,v 1.12 2002/10/04 19:10:12 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
- * Version:  4.0.2
+ * Version:  4.1
  *
  * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
  *
@@ -51,7 +51,7 @@ _mesa_alloc_alpha_buffers( GLframebuffer *buffer )
    if (buffer->FrontLeftAlpha) {
       MESA_PBUFFER_FREE( buffer->FrontLeftAlpha );
    }
-   buffer->FrontLeftAlpha = (GLchan *) MESA_PBUFFER_ALLOC( bytes );
+   buffer->FrontLeftAlpha = MESA_PBUFFER_ALLOC( bytes );
    if (!buffer->FrontLeftAlpha) {
       /* out of memory */
       _mesa_error( NULL, GL_OUT_OF_MEMORY,
@@ -62,7 +62,7 @@ _mesa_alloc_alpha_buffers( GLframebuffer *buffer )
       if (buffer->BackLeftAlpha) {
          MESA_PBUFFER_FREE( buffer->BackLeftAlpha );
       }
-      buffer->BackLeftAlpha = (GLchan *) MESA_PBUFFER_ALLOC( bytes );
+      buffer->BackLeftAlpha = MESA_PBUFFER_ALLOC( bytes );
       if (!buffer->BackLeftAlpha) {
          /* out of memory */
          _mesa_error( NULL, GL_OUT_OF_MEMORY,
@@ -74,7 +74,7 @@ _mesa_alloc_alpha_buffers( GLframebuffer *buffer )
       if (buffer->FrontRightAlpha) {
          MESA_PBUFFER_FREE( buffer->FrontRightAlpha );
       }
-      buffer->FrontRightAlpha = (GLchan *) MESA_PBUFFER_ALLOC( bytes );
+      buffer->FrontRightAlpha = MESA_PBUFFER_ALLOC( bytes );
       if (!buffer->FrontRightAlpha) {
          /* out of memory */
          _mesa_error( NULL, GL_OUT_OF_MEMORY,
@@ -85,7 +85,7 @@ _mesa_alloc_alpha_buffers( GLframebuffer *buffer )
          if (buffer->BackRightAlpha) {
             MESA_PBUFFER_FREE( buffer->BackRightAlpha );
          }
-         buffer->BackRightAlpha = (GLchan *) MESA_PBUFFER_ALLOC( bytes );
+         buffer->BackRightAlpha = MESA_PBUFFER_ALLOC( bytes );
          if (!buffer->BackRightAlpha) {
             /* out of memory */
             _mesa_error( NULL, GL_OUT_OF_MEMORY,
@@ -113,16 +113,16 @@ _mesa_clear_alpha_buffers( GLcontext *ctx )
       if (bufferBit & ctx->Color._DrawDestMask) {
          GLchan *buffer;
          if (bufferBit == FRONT_LEFT_BIT) {
-            buffer = ctx->DrawBuffer->FrontLeftAlpha;
+            buffer = (GLchan *) ctx->DrawBuffer->FrontLeftAlpha;
          }
          else if (bufferBit == FRONT_RIGHT_BIT) {
-            buffer = ctx->DrawBuffer->FrontRightAlpha;
+            buffer = (GLchan *) ctx->DrawBuffer->FrontRightAlpha;
          }
          else if (bufferBit == BACK_LEFT_BIT) {
-            buffer = ctx->DrawBuffer->BackLeftAlpha;
+            buffer = (GLchan *) ctx->DrawBuffer->BackLeftAlpha;
          }
          else {
-            buffer = ctx->DrawBuffer->BackRightAlpha;
+            buffer = (GLchan *) ctx->DrawBuffer->BackRightAlpha;
          }
 
          if (ctx->Scissor.Enabled) {
@@ -173,20 +173,20 @@ GLchan *get_alpha_buffer( GLcontext *ctx )
 {
    switch (ctx->Color._DriverDrawBuffer) {
    case GL_FRONT_LEFT:
-      return ctx->DrawBuffer->FrontLeftAlpha;
+      return (GLchan *) ctx->DrawBuffer->FrontLeftAlpha;
       break;
    case GL_BACK_LEFT:
-      return ctx->DrawBuffer->BackLeftAlpha;
+      return (GLchan *) ctx->DrawBuffer->BackLeftAlpha;
       break;
    case GL_FRONT_RIGHT:
-      return ctx->DrawBuffer->FrontRightAlpha;
+      return (GLchan *) ctx->DrawBuffer->FrontRightAlpha;
       break;
    case GL_BACK_RIGHT:
-      return ctx->DrawBuffer->BackRightAlpha;
+      return (GLchan *) ctx->DrawBuffer->BackRightAlpha;
       break;
    default:
       _mesa_problem(ctx, "Bad DriverDrawBuffer in _mesa_write_alpha_span()");
-      return ctx->DrawBuffer->FrontLeftAlpha; /* aribitrary */
+      return (GLchan *) ctx->DrawBuffer->FrontLeftAlpha; /* aribitrary */
    }
 }
 
diff --git a/src/mesa/swrast/s_buffers.c b/src/mesa/swrast/s_buffers.c
index dcfa26f5e20..1b07eb0bef0 100644
--- a/src/mesa/swrast/s_buffers.c
+++ b/src/mesa/swrast/s_buffers.c
@@ -1,4 +1,4 @@
-/* $Id: s_buffers.c,v 1.12 2002/07/09 01:22:52 brianp Exp $ */
+/* $Id: s_buffers.c,v 1.13 2002/10/04 19:10:12 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -26,6 +26,7 @@
 
 
 #include "glheader.h"
+#include "colormac.h"
 #include "macros.h"
 #include "mem.h"
 
@@ -53,19 +54,17 @@ clear_color_buffer_with_masking( GLcontext *ctx )
 
    if (ctx->Visual.rgbMode) {
       /* RGBA mode */
-      const GLchan r = ctx->Color.ClearColor[0];
-      const GLchan g = ctx->Color.ClearColor[1];
-      const GLchan b = ctx->Color.ClearColor[2];
-      const GLchan a = ctx->Color.ClearColor[3];
+      GLchan clearColor[4];
       GLint i;
+      CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
       for (i = 0; i < height; i++) {
          GLchan rgba[MAX_WIDTH][4];
          GLint j;
          for (j = 0; j < width; j++) {
-            rgba[j][RCOMP] = r;
-            rgba[j][GCOMP] = g;
-            rgba[j][BCOMP] = b;
-            rgba[j][ACOMP] = a;
+            COPY_CHAN4(rgba[j], clearColor);
          }
          _mesa_mask_rgba_array( ctx, width, x, y + i, rgba );
          (*swrast->Driver.WriteRGBASpan)( ctx, width, x, y + i,
@@ -104,20 +103,19 @@ clear_color_buffer(GLcontext *ctx)
 
    if (ctx->Visual.rgbMode) {
       /* RGBA mode */
-      const GLchan r = ctx->Color.ClearColor[0];
-      const GLchan g = ctx->Color.ClearColor[1];
-      const GLchan b = ctx->Color.ClearColor[2];
-      const GLchan a = ctx->Color.ClearColor[3];
+      GLchan clearColor[4];
       GLchan span[MAX_WIDTH][4];
       GLint i;
 
+      CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+      CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+
       ASSERT(*((GLuint *) &ctx->Color.ColorMask) == 0xffffffff);
 
       for (i = 0; i < width; i++) {
-         span[i][RCOMP] = r;
-         span[i][GCOMP] = g;
-         span[i][BCOMP] = b;
-         span[i][ACOMP] = a;
+         COPY_CHAN4(span[i], clearColor);
       }
       for (i = 0; i < height; i++) {
          (*swrast->Driver.WriteRGBASpan)( ctx, width, x, y + i,
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index b8428c9a66a..d816104638e 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -1,4 +1,4 @@
-/* $Id: s_texture.c,v 1.67 2002/09/23 16:37:15 brianp Exp $ */
+/* $Id: s_texture.c,v 1.68 2002/10/04 19:10:13 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -417,7 +417,7 @@ sample_1d_nearest(GLcontext *ctx,
 
    if (i < 0 || i >= (GLint) img->Width) {
       /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
-      COPY_CHAN4(rgba, tObj->BorderColor);
+      COPY_CHAN4(rgba, tObj->_BorderChan);
    }
    else {
       (*img->FetchTexel)(img, i, 0, 0, (GLvoid *) rgba);
@@ -469,7 +469,7 @@ sample_1d_linear(GLcontext *ctx,
       GLchan t0[4], t1[4];  /* texels */
 
       if (useBorderColor & I0BIT) {
-         COPY_CHAN4(t0, tObj->BorderColor);
+         COPY_CHAN4(t0, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, 0, 0, (GLvoid *) t0);
@@ -478,7 +478,7 @@ sample_1d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & I1BIT) {
-         COPY_CHAN4(t1, tObj->BorderColor);
+         COPY_CHAN4(t1, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, 0, 0, (GLvoid *) t1);
@@ -746,7 +746,7 @@ sample_2d_nearest(GLcontext *ctx,
 
    if (i < 0 || i >= (GLint) img->Width || j < 0 || j >= (GLint) img->Height) {
       /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
-      COPY_CHAN4(rgba, tObj->BorderColor);
+      COPY_CHAN4(rgba, tObj->_BorderChan);
    }
    else {
       (*img->FetchTexel)(img, i, j, 0, (GLvoid *) rgba);
@@ -814,7 +814,7 @@ sample_2d_linear(GLcontext *ctx,
       GLchan t11[4];
 
       if (useBorderColor & (I0BIT | J0BIT)) {
-         COPY_CHAN4(t00, tObj->BorderColor);
+         COPY_CHAN4(t00, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j0, 0, (GLvoid *) t00);
@@ -823,7 +823,7 @@ sample_2d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J0BIT)) {
-         COPY_CHAN4(t10, tObj->BorderColor);
+         COPY_CHAN4(t10, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j0, 0, (GLvoid *) t10);
@@ -832,7 +832,7 @@ sample_2d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I0BIT | J1BIT)) {
-         COPY_CHAN4(t01, tObj->BorderColor);
+         COPY_CHAN4(t01, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j1, 0, (GLvoid *) t01);
@@ -841,7 +841,7 @@ sample_2d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J1BIT)) {
-         COPY_CHAN4(t11, tObj->BorderColor);
+         COPY_CHAN4(t11, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j1, 0, (GLvoid *) t11);
@@ -1334,7 +1334,7 @@ sample_3d_nearest(GLcontext *ctx,
        j < 0 || j >= (GLint) img->Height ||
        k < 0 || k >= (GLint) img->Depth) {
       /* Need this test for GL_CLAMP_TO_BORDER_ARB mode */
-      COPY_CHAN4(rgba, tObj->BorderColor);
+      COPY_CHAN4(rgba, tObj->_BorderChan);
    }
    else {
       (*img->FetchTexel)(img, i, j, k, (GLvoid *) rgba);
@@ -1417,7 +1417,7 @@ sample_3d_linear(GLcontext *ctx,
       GLchan t100[4], t110[4], t101[4], t111[4];
 
       if (useBorderColor & (I0BIT | J0BIT | K0BIT)) {
-         COPY_CHAN4(t000, tObj->BorderColor);
+         COPY_CHAN4(t000, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j0, k0, (GLvoid *) t000);
@@ -1426,7 +1426,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J0BIT | K0BIT)) {
-         COPY_CHAN4(t100, tObj->BorderColor);
+         COPY_CHAN4(t100, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j0, k0, (GLvoid *) t100);
@@ -1435,7 +1435,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I0BIT | J1BIT | K0BIT)) {
-         COPY_CHAN4(t010, tObj->BorderColor);
+         COPY_CHAN4(t010, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j1, k0, (GLvoid *) t010);
@@ -1444,7 +1444,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J1BIT | K0BIT)) {
-         COPY_CHAN4(t110, tObj->BorderColor);
+         COPY_CHAN4(t110, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j1, k0, (GLvoid *) t110);
@@ -1454,7 +1454,7 @@ sample_3d_linear(GLcontext *ctx,
       }
 
       if (useBorderColor & (I0BIT | J0BIT | K1BIT)) {
-         COPY_CHAN4(t001, tObj->BorderColor);
+         COPY_CHAN4(t001, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j0, k1, (GLvoid *) t001);
@@ -1463,7 +1463,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J0BIT | K1BIT)) {
-         COPY_CHAN4(t101, tObj->BorderColor);
+         COPY_CHAN4(t101, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j0, k1, (GLvoid *) t101);
@@ -1472,7 +1472,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I0BIT | J1BIT | K1BIT)) {
-         COPY_CHAN4(t011, tObj->BorderColor);
+         COPY_CHAN4(t011, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i0, j1, k1, (GLvoid *) t011);
@@ -1481,7 +1481,7 @@ sample_3d_linear(GLcontext *ctx,
          }
       }
       if (useBorderColor & (I1BIT | J1BIT | K1BIT)) {
-         COPY_CHAN4(t111, tObj->BorderColor);
+         COPY_CHAN4(t111, tObj->_BorderChan);
       }
       else {
          (*img->FetchTexel)(img, i1, j1, k1, (GLvoid *) t111);
@@ -2212,7 +2212,7 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
    const struct gl_texture_image *texImage = tObj->Image[baseLevel];
    const GLuint width = texImage->Width;
    const GLuint height = texImage->Height;
-   const GLchan ambient = tObj->ShadowAmbient;
+   const GLchan ambient;
    GLenum function;
    GLchan result;
 
@@ -2223,6 +2223,8 @@ sample_depth_texture( GLcontext *ctx, GLuint unit,
           tObj->Target == GL_TEXTURE_2D ||
           tObj->Target == GL_TEXTURE_RECTANGLE_NV);
 
+   UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
+
    /* XXXX if tObj->MinFilter != tObj->MagFilter, we're ignoring lambda */
 
    /* XXX this could be precomputed and saved in the texture object */
@@ -2501,7 +2503,7 @@ sample_depth_texture2(const GLcontext *ctx,
    const struct gl_texture_image *texImage = texObj->Image[baseLevel];
    const GLuint width = texImage->Width;
    const GLuint height = texImage->Height;
-   const GLchan ambient = texObj->ShadowAmbient;
+   GLchan ambient;
    GLboolean lequal, gequal;
 
    if (texObj->Target != GL_TEXTURE_2D) {
@@ -2523,6 +2525,8 @@ sample_depth_texture2(const GLcontext *ctx,
       return;
    }
 
+   UNCLAMPED_FLOAT_TO_CHAN(ambient, tObj->ShadowAmbient);
+
    if (texObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
       lequal = GL_TRUE;
       gequal = GL_FALSE;