From 9e2d30e0b8242d1e4afcf05513bd3d7e0de504a2 Mon Sep 17 00:00:00 2001
From: Ian Romanick <ian.d.romanick@intel.com>
Date: Wed, 24 Feb 2010 15:45:36 -0800
Subject: [PATCH] swrast: Remove support for Clear into a color-index buffer

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
---
 src/mesa/swrast/s_clear.c | 109 +++-----------------------------------
 1 file changed, 6 insertions(+), 103 deletions(-)

diff --git a/src/mesa/swrast/s_clear.c b/src/mesa/swrast/s_clear.c
index 820297f3eee..7b0a63391fa 100644
--- a/src/mesa/swrast/s_clear.c
+++ b/src/mesa/swrast/s_clear.c
@@ -51,7 +51,6 @@ clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb,
    SWspan span;
    GLint i;
 
-   ASSERT(ctx->Visual.rgbMode);
    ASSERT(rb->PutRow);
 
    /* Initialize color span with clear color */
@@ -104,45 +103,6 @@ clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb,
 }
 
 
-/**
- * Clear color index buffer with masking.
- */
-static void
-clear_ci_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
-{
-   const GLint x = ctx->DrawBuffer->_Xmin;
-   const GLint y = ctx->DrawBuffer->_Ymin;
-   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
-   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
-   SWspan span;
-   GLint i;
-
-   ASSERT(!ctx->Visual.rgbMode);
-   ASSERT(rb->PutRow);
-   ASSERT(rb->DataType == GL_UNSIGNED_INT);
-
-   /* Initialize index span with clear index */
-   INIT_SPAN(span, GL_BITMAP);
-   span.end = width;
-   span.arrayMask = SPAN_INDEX;
-   for (i = 0; i < width;i++) {
-      span.array->index[i] = ctx->Color.ClearIndex;
-   }
-
-   /* Note that masking will change the color indexes, but only the
-    * bits for which the write mask is GL_FALSE.  The bits
-    * which are write-enabled won't get modified.
-    */
-   for (i = 0; i < height;i++) {
-      span.x = x;
-      span.y = y + i;
-      _swrast_mask_ci_span(ctx, rb, &span);
-      /* write masked row */
-      rb->PutRow(ctx, rb, width, x, y + i, span.array->index, NULL);
-   }
-}
-
-
 /**
  * Clear an rgba color buffer without channel masking.
  */
@@ -158,8 +118,6 @@ clear_rgba_buffer(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint buf)
    GLvoid *clearVal;
    GLint i;
 
-   ASSERT(ctx->Visual.rgbMode);
-
    ASSERT(ctx->Color.ColorMask[buf][0] &&
           ctx->Color.ColorMask[buf][1] &&
           ctx->Color.ColorMask[buf][2] &&
@@ -196,50 +154,6 @@ clear_rgba_buffer(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint buf)
 }
 
 
-/**
- * Clear color index buffer without masking.
- */
-static void
-clear_ci_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
-{
-   const GLint x = ctx->DrawBuffer->_Xmin;
-   const GLint y = ctx->DrawBuffer->_Ymin;
-   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
-   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
-   GLubyte clear8;
-   GLushort clear16;
-   GLuint clear32;
-   GLvoid *clearVal;
-   GLint i;
-
-   ASSERT(!ctx->Visual.rgbMode);
-
-   ASSERT(rb->PutMonoRow);
-
-   /* setup clear value */
-   switch (rb->DataType) {
-      case GL_UNSIGNED_BYTE:
-         clear8 = (GLubyte) ctx->Color.ClearIndex;
-         clearVal = &clear8;
-         break;
-      case GL_UNSIGNED_SHORT:
-         clear16 = (GLushort) ctx->Color.ClearIndex;
-         clearVal = &clear16;
-         break;
-      case GL_UNSIGNED_INT:
-         clear32 = ctx->Color.ClearIndex;
-         clearVal = &clear32;
-         break;
-      default:
-         _mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
-         return;
-   }
-
-   for (i = 0; i < height; i++)
-      rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
-}
-
-
 /**
  * Clear the front/back/left/right/aux color buffers.
  * This function is usually only called if the device driver can't
@@ -252,25 +166,14 @@ clear_color_buffers(GLcontext *ctx)
 
    for (buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {
       struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];
-      if (ctx->Visual.rgbMode) {
-         if (ctx->Color.ColorMask[buf][0] == 0 || 
-             ctx->Color.ColorMask[buf][1] == 0 || 
-             ctx->Color.ColorMask[buf][2] == 0 || 
-             ctx->Color.ColorMask[buf][3] == 0) {
-            clear_rgba_buffer_with_masking(ctx, rb, buf);
-         }
-         else {
-            clear_rgba_buffer(ctx, rb, buf);
-         }
+      if (ctx->Color.ColorMask[buf][0] == 0 ||
+          ctx->Color.ColorMask[buf][1] == 0 ||
+          ctx->Color.ColorMask[buf][2] == 0 ||
+          ctx->Color.ColorMask[buf][3] == 0) {
+         clear_rgba_buffer_with_masking(ctx, rb, buf);
       }
       else {
-         const GLuint indexMask = (1 << _mesa_get_format_bits(rb->Format, GL_INDEX_BITS)) - 1;
-         if ((ctx->Color.IndexMask & indexMask) != indexMask) {
-            clear_ci_buffer_with_masking(ctx, rb);
-         }
-         else {
-            clear_ci_buffer(ctx, rb);
-         }
+         clear_rgba_buffer(ctx, rb, buf);
       }
    }
 }
-- 
2.30.2