From cea0e8e6700e871bb9bcb334cb75fbfbfcdfd702 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Thu, 25 Nov 1999 17:36:48 +0000
Subject: replaced Driver.SetBuffer() with SetDrawBuffer() and SetReadBuffer()

---
 src/mesa/main/accum.c    | 17 ++++++++++++-----
 src/mesa/main/dd.h       | 17 ++++++++++++++---
 src/mesa/main/teximage.c | 18 +++++++++++-------
 3 files changed, 37 insertions(+), 15 deletions(-)

(limited to 'src/mesa/main')

diff --git a/src/mesa/main/accum.c b/src/mesa/main/accum.c
index 8e6f3cae0f..81af5f6068 100644
--- a/src/mesa/main/accum.c
+++ b/src/mesa/main/accum.c
@@ -1,4 +1,4 @@
-/* $Id: accum.c,v 1.12 1999/11/24 18:48:30 brianp Exp $ */
+/* $Id: accum.c,v 1.13 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -221,7 +221,8 @@ _mesa_Accum( GLenum op, GLfloat value )
 	 break;
 
       case GL_ACCUM:
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
 
          /* May have to leave optimized accum buffer mode */
          if (ctx->IntegerAccumScaler == 0.0 && value > 0.0 && value <= 1.0)
@@ -269,11 +270,14 @@ _mesa_Accum( GLenum op, GLfloat value )
                ypos++;
             }
          }
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+         /* restore read buffer = draw buffer (the default) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
 	 break;
 
       case GL_LOAD:
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
 
          /* This is a change to go into optimized accum buffer mode */
          if (value > 0.0 && value <= 1.0) {
@@ -328,7 +332,10 @@ _mesa_Accum( GLenum op, GLfloat value )
                ypos++;
             }
          }
-         (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+
+         /* restore read buffer = draw buffer (the default) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
 	 break;
 
       case GL_RETURN:
diff --git a/src/mesa/main/dd.h b/src/mesa/main/dd.h
index 55b973e43c..5dc04fb6fc 100644
--- a/src/mesa/main/dd.h
+++ b/src/mesa/main/dd.h
@@ -1,4 +1,4 @@
-/* $Id: dd.h,v 1.5 1999/11/22 21:54:14 brianp Exp $ */
+/* $Id: dd.h,v 1.6 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -180,9 +180,9 @@ struct dd_function_table {
     * This color should also be used in the "mono" drawing functions.
     */
 
-   GLboolean (*SetBuffer)( GLcontext *ctx, GLenum buffer );
+   GLboolean (*SetDrawBuffer)( GLcontext *ctx, GLenum buffer );
    /*
-    * Selects the color buffer(s) for reading and writing.
+    * Specifies the current buffer for writing.
     * The following values must be accepted when applicable:
     *    GL_FRONT_LEFT - this buffer always exists
     *    GL_BACK_LEFT - when double buffering
@@ -200,6 +200,17 @@ struct dd_function_table {
     *    GL_NONE - disable buffer write in device driver.
     */
 
+   void (*SetReadBuffer)( GLcontext *ctx, GLframebuffer *colorBuffer,
+                          GLenum buffer );
+   /*
+    * Specifies the current buffer for reading.
+    * colorBuffer will be one of:
+    *    GL_FRONT_LEFT - this buffer always exists
+    *    GL_BACK_LEFT - when double buffering
+    *    GL_FRONT_RIGHT - when using stereo
+    *    GL_BACK_RIGHT - when using stereo and double buffering
+    */
+
    void (*GetBufferSize)( GLcontext *ctx, GLuint *width, GLuint *height );
    /*
     * Returns the width and height of the current color buffer.
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 56955af6c8..2db59c0d7f 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1,4 +1,4 @@
-/* $Id: teximage.c,v 1.13 1999/11/24 18:48:31 brianp Exp $ */
+/* $Id: teximage.c,v 1.14 1999/11/25 17:36:48 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1627,7 +1627,8 @@ read_color_image( GLcontext *ctx, GLint x, GLint y,
       return NULL;
 
    /* Select buffer to read from */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                 ctx->Pixel.DriverReadBuffer );
 
    dst = image;
    stride = width * 4 * sizeof(GLubyte);
@@ -1637,8 +1638,9 @@ read_color_image( GLcontext *ctx, GLint x, GLint y,
       dst += stride;
    }
 
-   /* Restore drawing buffer */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+   /* Read from draw buffer (the default) */
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                 ctx->Color.DriverDrawBuffer );
 
    return image;
 }
@@ -1728,7 +1730,8 @@ copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
    components = components_in_intformat( format );
 
    /* Select buffer to read from */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                 ctx->Pixel.DriverReadBuffer );
 
    for (i = 0;i < height; i++) {
       GLubyte rgba[MAX_WIDTH][4];
@@ -1740,8 +1743,9 @@ copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
                                     &packing, GL_TRUE);
    }
 
-   /* Restore drawing buffer */
-   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+   /* Read from draw buffer (the default) */
+   (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                 ctx->Color.DriverDrawBuffer );
 }
 
 
-- 
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