svn merge ^/branches/released .

1 files changed, 566 insertions, 504 deletions

diff --git a/mesalib/src/mesa/main/clear.c b/mesalib/src/mesa/main/clear.c
index 49d86b3b1..3edcbe884 100644
--- a/mesalib/src/mesa/main/clear.c
+++ b/mesalib/src/mesa/main/clear.c
@@ -1,504 +1,566 @@
-/*
- * Mesa 3-D graphics library
- * Version:  7.1
- *
- * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-/**
- * \file clear.c
- * glClearColor, glClearIndex, glClear() functions.
- */
-
-
-
-#include "glheader.h"
-#include "clear.h"
-#include "context.h"
-#include "colormac.h"
-#include "enums.h"
-#include "macros.h"
-#include "state.h"
-
-
-
-#if _HAVE_FULL_GL
-void GLAPIENTRY
-_mesa_ClearIndex( GLfloat c )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   if (ctx->Color.ClearIndex == (GLuint) c)
-      return;
-
-   FLUSH_VERTICES(ctx, _NEW_COLOR);
-   ctx->Color.ClearIndex = (GLuint) c;
-}
-#endif
-
-
-/**
- * Specify the clear values for the color buffers.
- *
- * \param red red color component.
- * \param green green color component.
- * \param blue blue color component.
- * \param alpha alpha component.
- *
- * \sa glClearColor().
- *
- * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor.  On a
- * change, flushes the vertices and notifies the driver via the
- * dd_function_table::ClearColor callback.
- */
-void GLAPIENTRY
-_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
-{
-   GLfloat tmp[4];
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END(ctx);
-
-   tmp[0] = CLAMP(red,   0.0F, 1.0F);
-   tmp[1] = CLAMP(green, 0.0F, 1.0F);
-   tmp[2] = CLAMP(blue,  0.0F, 1.0F);
-   tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
-
-   if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
-      return; /* no change */
-
-   FLUSH_VERTICES(ctx, _NEW_COLOR);
-   COPY_4V(ctx->Color.ClearColor, tmp);
-
-   if (ctx->Driver.ClearColor) {
-      /* it's OK to call glClearColor in CI mode but it should be a NOP */
-      (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
-   }
-}
-
-
-/**
- * Clear buffers.
- * 
- * \param mask bit-mask indicating the buffers to be cleared.
- *
- * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
- * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
- * etc. If the rasterization mode is set to GL_RENDER then requests the driver
- * to clear the buffers, via the dd_function_table::Clear callback.
- */ 
-void GLAPIENTRY
-_mesa_Clear( GLbitfield mask )
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   FLUSH_CURRENT(ctx, 0);
-
-   if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "glClear 0x%x\n", mask);
-
-   if (mask & ~(GL_COLOR_BUFFER_BIT |
-                GL_DEPTH_BUFFER_BIT |
-                GL_STENCIL_BUFFER_BIT |
-                GL_ACCUM_BUFFER_BIT)) {
-      /* invalid bit set */
-      _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
-      return;
-   }
-
-   if (ctx->NewState) {
-      _mesa_update_state( ctx );	/* update _Xmin, etc */
-   }
-
-   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
-      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
-                  "glClear(incomplete framebuffer)");
-      return;
-   }
-
-   if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||
-       ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||
-       ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)
-      return;
-
-   if (ctx->RenderMode == GL_RENDER) {
-      GLbitfield bufferMask;
-
-      /* don't clear depth buffer if depth writing disabled */
-      if (!ctx->Depth.Mask)
-         mask &= ~GL_DEPTH_BUFFER_BIT;
-
-      /* Build the bitmask to send to device driver's Clear function.
-       * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
-       * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
-       * BUFFER_BIT_COLORn flags.
-       */
-      bufferMask = 0;
-      if (mask & GL_COLOR_BUFFER_BIT) {
-         GLuint i;
-         for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {
-            bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]);
-         }
-      }
-
-      if ((mask & GL_DEPTH_BUFFER_BIT)
-          && ctx->DrawBuffer->Visual.haveDepthBuffer) {
-         bufferMask |= BUFFER_BIT_DEPTH;
-      }
-
-      if ((mask & GL_STENCIL_BUFFER_BIT)
-          && ctx->DrawBuffer->Visual.haveStencilBuffer) {
-         bufferMask |= BUFFER_BIT_STENCIL;
-      }
-
-      if ((mask & GL_ACCUM_BUFFER_BIT)
-          && ctx->DrawBuffer->Visual.haveAccumBuffer) {
-         bufferMask |= BUFFER_BIT_ACCUM;
-      }
-
-      ASSERT(ctx->Driver.Clear);
-      ctx->Driver.Clear(ctx, bufferMask);
-   }
-}
-
-
-/** Returned by make_color_buffer_mask() for errors */
-#define INVALID_MASK ~0x0
-
-
-/**
- * Convert the glClearBuffer 'drawbuffer' parameter into a bitmask of
- * BUFFER_BIT_x values.
- * Return INVALID_MASK if the drawbuffer value is invalid.
- */
-static GLbitfield
-make_color_buffer_mask(GLcontext *ctx, GLint drawbuffer)
-{
-   const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment;
-   GLbitfield mask = 0x0;
-
-   switch (drawbuffer) {
-   case GL_FRONT:
-      if (att[BUFFER_FRONT_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_LEFT;
-      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_RIGHT;
-      break;
-   case GL_BACK:
-      if (att[BUFFER_BACK_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_LEFT;
-      if (att[BUFFER_BACK_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_RIGHT;
-      break;
-   case GL_LEFT:
-      if (att[BUFFER_FRONT_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_LEFT;
-      if (att[BUFFER_BACK_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_LEFT;
-      break;
-   case GL_RIGHT:
-      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_RIGHT;
-      if (att[BUFFER_BACK_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_RIGHT;
-      break;
-   case GL_FRONT_AND_BACK:
-      if (att[BUFFER_FRONT_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_LEFT;
-      if (att[BUFFER_BACK_LEFT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_LEFT;
-      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_FRONT_RIGHT;
-      if (att[BUFFER_BACK_RIGHT].Renderbuffer)
-         mask |= BUFFER_BIT_BACK_RIGHT;
-      break;
-   default:
-      if (drawbuffer < 0 || drawbuffer >= (GLint)ctx->Const.MaxDrawBuffers) {
-         mask = INVALID_MASK;
-      }
-      else if (att[BUFFER_COLOR0 + drawbuffer].Renderbuffer) {
-         mask |= (BUFFER_BIT_COLOR0 << drawbuffer);
-      }
-   }
-
-   return mask;
-}
-
-
-
-/**
- * New in GL 3.0
- * Clear signed integer color buffer or stencil buffer (not depth).
- */
-void GLAPIENTRY
-_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   FLUSH_CURRENT(ctx, 0);
-
-   if (ctx->NewState) {
-      _mesa_update_state( ctx );
-   }
-
-   switch (buffer) {
-   case GL_STENCIL:
-      if (drawbuffer != 0) {
-         _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
-                     drawbuffer);
-         return;
-      }
-      else {
-         /* Save current stencil clear value, set to 'value', do the
-          * stencil clear and restore the clear value.
-          * XXX in the future we may have a new ctx->Driver.ClearBuffer()
-          * hook instead.
-          */
-         const GLuint clearSave = ctx->Stencil.Clear;
-         ctx->Stencil.Clear = *value;
-         if (ctx->Driver.ClearStencil)
-            ctx->Driver.ClearStencil(ctx, *value);
-         ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL);
-         ctx->Stencil.Clear = clearSave;
-         if (ctx->Driver.ClearStencil)
-            ctx->Driver.ClearStencil(ctx, clearSave);
-      }
-      break;
-   case GL_COLOR:
-      {
-         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
-         if (mask == INVALID_MASK) {
-            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
-                        drawbuffer);
-            return;
-         }
-         else if (mask) {
-            /* XXX note: we're putting the integer clear values into the
-             * floating point state var.  This will not always work.  We'll
-             * need a new ctx->Driver.ClearBuffer() hook....
-             */
-            GLclampf clearSave[4];
-            /* save color */
-            COPY_4V(clearSave, ctx->Color.ClearColor);
-            /* set color */
-            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
-            /* clear buffer(s) */
-            ctx->Driver.Clear(ctx, mask);
-            /* restore color */
-            COPY_4V(ctx->Color.ClearColor, clearSave);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, clearSave);
-         }
-      }
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferiv(buffer=%s)",
-                  _mesa_lookup_enum_by_nr(buffer));
-      return;
-   }
-}
-
-
-/**
- * New in GL 3.0
- * Clear unsigned integer color buffer (not depth, not stencil).
- */
-void GLAPIENTRY
-_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   FLUSH_CURRENT(ctx, 0);
-
-   if (ctx->NewState) {
-      _mesa_update_state( ctx );
-   }
-
-   switch (buffer) {
-   case GL_COLOR:
-      {
-         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
-         if (mask == INVALID_MASK) {
-            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",
-                        drawbuffer);
-            return;
-         }
-         else if (mask) {
-            /* XXX note: we're putting the uint clear values into the
-             * floating point state var.  This will not always work.  We'll
-             * need a new ctx->Driver.ClearBuffer() hook....
-             */
-            GLclampf clearSave[4];
-            /* save color */
-            COPY_4V(clearSave, ctx->Color.ClearColor);
-            /* set color */
-            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
-            /* clear buffer(s) */
-            ctx->Driver.Clear(ctx, mask);
-            /* restore color */
-            COPY_4V(ctx->Color.ClearColor, clearSave);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, clearSave);
-         }
-      }
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferuiv(buffer=%s)",
-                  _mesa_lookup_enum_by_nr(buffer));
-      return;
-   }
-}
-
-
-/**
- * New in GL 3.0
- * Clear fixed-pt or float color buffer or depth buffer (not stencil).
- */
-void GLAPIENTRY
-_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   FLUSH_CURRENT(ctx, 0);
-
-   if (ctx->NewState) {
-      _mesa_update_state( ctx );
-   }
-
-   switch (buffer) {
-   case GL_DEPTH:
-      if (drawbuffer != 0) {
-         _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
-                     drawbuffer);
-         return;
-      }
-      else {
-         /* Save current depth clear value, set to 'value', do the
-          * depth clear and restore the clear value.
-          * XXX in the future we may have a new ctx->Driver.ClearBuffer()
-          * hook instead.
-          */
-         const GLclampd clearSave = ctx->Depth.Clear;
-         ctx->Depth.Clear = *value;
-         if (ctx->Driver.ClearDepth)
-            ctx->Driver.ClearDepth(ctx, *value);
-         ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);
-         ctx->Depth.Clear = clearSave;
-         if (ctx->Driver.ClearDepth)
-            ctx->Driver.ClearDepth(ctx, clearSave);
-      }
-      /* clear depth buffer to value */
-      break;
-   case GL_COLOR:
-      {
-         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);
-         if (mask == INVALID_MASK) {
-            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",
-                        drawbuffer);
-            return;
-         }
-         else if (mask) {
-            GLclampf clearSave[4];
-            /* save color */
-            COPY_4V(clearSave, ctx->Color.ClearColor);
-            /* set color */
-            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);
-            /* clear buffer(s) */
-            ctx->Driver.Clear(ctx, mask);
-            /* restore color */
-            COPY_4V(ctx->Color.ClearColor, clearSave);
-            if (ctx->Driver.ClearColor)
-               ctx->Driver.ClearColor(ctx, clearSave);
-         }
-      }
-      break;
-   default:
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfv(buffer=%s)",
-                  _mesa_lookup_enum_by_nr(buffer));
-      return;
-   }
-}
-
-
-/**
- * New in GL 3.0
- * Clear depth/stencil buffer only.
- */
-void GLAPIENTRY
-_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,
-                    GLfloat depth, GLint stencil)
-{
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
-   FLUSH_CURRENT(ctx, 0);
-
-   if (buffer != GL_DEPTH_STENCIL) {
-      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfi(buffer=%s)",
-                  _mesa_lookup_enum_by_nr(buffer));
-      return;
-   }
-
-   if (drawbuffer != 0) {
-      _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)",
-                  drawbuffer);
-      return;
-   }
-
-   if (ctx->NewState) {
-      _mesa_update_state( ctx );
-   }
-
-   {
-      /* save current clear values */
-      const GLclampd clearDepthSave = ctx->Depth.Clear;
-      const GLuint clearStencilSave = ctx->Stencil.Clear;
-
-      /* set new clear values */
-      ctx->Depth.Clear = depth;
-      ctx->Stencil.Clear = stencil;
-      if (ctx->Driver.ClearDepth)
-         ctx->Driver.ClearDepth(ctx, depth);
-      if (ctx->Driver.ClearStencil)
-         ctx->Driver.ClearStencil(ctx, stencil);
-
-      /* clear buffers */
-      ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);
-
-      /* restore */
-      ctx->Depth.Clear = clearDepthSave;
-      ctx->Stencil.Clear = clearStencilSave;
-      if (ctx->Driver.ClearDepth)
-         ctx->Driver.ClearDepth(ctx, clearDepthSave);
-      if (ctx->Driver.ClearStencil)
-         ctx->Driver.ClearStencil(ctx, clearStencilSave);
-   }
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  7.1

+ *

+ * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice shall be included

+ * in all copies or substantial portions of the Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ */

+

+

+/**

+ * \file clear.c

+ * glClearColor, glClearIndex, glClear() functions.

+ */

+

+

+

+#include "glheader.h"

+#include "clear.h"

+#include "context.h"

+#include "colormac.h"

+#include "enums.h"

+#include "macros.h"

+#include "state.h"

+

+

+

+#if _HAVE_FULL_GL

+void GLAPIENTRY

+_mesa_ClearIndex( GLfloat c )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   if (ctx->Color.ClearIndex == (GLuint) c)

+      return;

+

+   FLUSH_VERTICES(ctx, _NEW_COLOR);

+   ctx->Color.ClearIndex = (GLuint) c;

+}

+#endif

+

+

+/**

+ * Specify the clear values for the color buffers.

+ *

+ * \param red red color component.

+ * \param green green color component.

+ * \param blue blue color component.

+ * \param alpha alpha component.

+ *

+ * \sa glClearColor().

+ *

+ * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor.  On a

+ * change, flushes the vertices and notifies the driver via the

+ * dd_function_table::ClearColor callback.

+ */

+void GLAPIENTRY

+_mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )

+{

+   GLfloat tmp[4];

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   tmp[0] = CLAMP(red,   0.0F, 1.0F);

+   tmp[1] = CLAMP(green, 0.0F, 1.0F);

+   tmp[2] = CLAMP(blue,  0.0F, 1.0F);

+   tmp[3] = CLAMP(alpha, 0.0F, 1.0F);

+

+   if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))

+      return; /* no change */

+

+   FLUSH_VERTICES(ctx, _NEW_COLOR);

+   COPY_4V(ctx->Color.ClearColor, tmp);

+

+   if (ctx->Driver.ClearColor) {

+      /* it's OK to call glClearColor in CI mode but it should be a NOP */

+      (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);

+   }

+}

+

+

+/**

+ * GL_EXT_texture_integer

+ */

+void GLAPIENTRY

+_mesa_ClearColorIiEXT(GLint r, GLint g, GLint b, GLint a)

+{

+   GLfloat tmp[4];

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   tmp[0] = (GLfloat) r;

+   tmp[1] = (GLfloat) g;

+   tmp[2] = (GLfloat) b;

+   tmp[3] = (GLfloat) a;

+

+   if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))

+      return; /* no change */

+

+   FLUSH_VERTICES(ctx, _NEW_COLOR);

+

+   /* XXX we should eventually have a float/int/uint union for

+    * the ctx->Color.ClearColor state.

+    */

+   COPY_4V(ctx->Color.ClearColor, tmp);

+

+   if (ctx->Driver.ClearColor) {

+      ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);

+   }

+}

+

+

+/**

+ * GL_EXT_texture_integer

+ */

+void GLAPIENTRY

+_mesa_ClearColorIuiEXT(GLuint r, GLuint g, GLuint b, GLuint a)

+{

+   GLfloat tmp[4];

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END(ctx);

+

+   tmp[0] = (GLfloat) r;

+   tmp[1] = (GLfloat) g;

+   tmp[2] = (GLfloat) b;

+   tmp[3] = (GLfloat) a;

+

+   if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))

+      return; /* no change */

+

+   FLUSH_VERTICES(ctx, _NEW_COLOR);

+

+   /* XXX we should eventually have a float/int/uint union for

+    * the ctx->Color.ClearColor state.

+    */

+   COPY_4V(ctx->Color.ClearColor, tmp);

+

+   if (ctx->Driver.ClearColor) {

+      ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);

+   }

+}

+

+

+/**

+ * Clear buffers.

+ * 

+ * \param mask bit-mask indicating the buffers to be cleared.

+ *

+ * Flushes the vertices and verifies the parameter. If __struct gl_contextRec::NewState

+ * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,

+ * etc. If the rasterization mode is set to GL_RENDER then requests the driver

+ * to clear the buffers, via the dd_function_table::Clear callback.

+ */ 

+void GLAPIENTRY

+_mesa_Clear( GLbitfield mask )

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   FLUSH_CURRENT(ctx, 0);

+

+   if (MESA_VERBOSE & VERBOSE_API)

+      _mesa_debug(ctx, "glClear 0x%x\n", mask);

+

+   if (mask & ~(GL_COLOR_BUFFER_BIT |

+                GL_DEPTH_BUFFER_BIT |

+                GL_STENCIL_BUFFER_BIT |

+                GL_ACCUM_BUFFER_BIT)) {

+      /* invalid bit set */

+      _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);

+      return;

+   }

+

+   if (ctx->NewState) {

+      _mesa_update_state( ctx );	/* update _Xmin, etc */

+   }

+

+   if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {

+      _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,

+                  "glClear(incomplete framebuffer)");

+      return;

+   }

+

+   if (ctx->DrawBuffer->Width == 0 || ctx->DrawBuffer->Height == 0 ||

+       ctx->DrawBuffer->_Xmin >= ctx->DrawBuffer->_Xmax ||

+       ctx->DrawBuffer->_Ymin >= ctx->DrawBuffer->_Ymax)

+      return;

+

+   if (ctx->RenderMode == GL_RENDER) {

+      GLbitfield bufferMask;

+

+      /* don't clear depth buffer if depth writing disabled */

+      if (!ctx->Depth.Mask)

+         mask &= ~GL_DEPTH_BUFFER_BIT;

+

+      /* Build the bitmask to send to device driver's Clear function.

+       * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4

+       * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the

+       * BUFFER_BIT_COLORn flags.

+       */

+      bufferMask = 0;

+      if (mask & GL_COLOR_BUFFER_BIT) {

+         GLuint i;

+         for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers; i++) {

+            bufferMask |= (1 << ctx->DrawBuffer->_ColorDrawBufferIndexes[i]);

+         }

+      }

+

+      if ((mask & GL_DEPTH_BUFFER_BIT)

+          && ctx->DrawBuffer->Visual.haveDepthBuffer) {

+         bufferMask |= BUFFER_BIT_DEPTH;

+      }

+

+      if ((mask & GL_STENCIL_BUFFER_BIT)

+          && ctx->DrawBuffer->Visual.haveStencilBuffer) {

+         bufferMask |= BUFFER_BIT_STENCIL;

+      }

+

+      if ((mask & GL_ACCUM_BUFFER_BIT)

+          && ctx->DrawBuffer->Visual.haveAccumBuffer) {

+         bufferMask |= BUFFER_BIT_ACCUM;

+      }

+

+      ASSERT(ctx->Driver.Clear);

+      ctx->Driver.Clear(ctx, bufferMask);

+   }

+}

+

+

+/** Returned by make_color_buffer_mask() for errors */

+#define INVALID_MASK ~0x0

+

+

+/**

+ * Convert the glClearBuffer 'drawbuffer' parameter into a bitmask of

+ * BUFFER_BIT_x values.

+ * Return INVALID_MASK if the drawbuffer value is invalid.

+ */

+static GLbitfield

+make_color_buffer_mask(struct gl_context *ctx, GLint drawbuffer)

+{

+   const struct gl_renderbuffer_attachment *att = ctx->DrawBuffer->Attachment;

+   GLbitfield mask = 0x0;

+

+   switch (drawbuffer) {

+   case GL_FRONT:

+      if (att[BUFFER_FRONT_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_LEFT;

+      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_RIGHT;

+      break;

+   case GL_BACK:

+      if (att[BUFFER_BACK_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_LEFT;

+      if (att[BUFFER_BACK_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_RIGHT;

+      break;

+   case GL_LEFT:

+      if (att[BUFFER_FRONT_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_LEFT;

+      if (att[BUFFER_BACK_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_LEFT;

+      break;

+   case GL_RIGHT:

+      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_RIGHT;

+      if (att[BUFFER_BACK_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_RIGHT;

+      break;

+   case GL_FRONT_AND_BACK:

+      if (att[BUFFER_FRONT_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_LEFT;

+      if (att[BUFFER_BACK_LEFT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_LEFT;

+      if (att[BUFFER_FRONT_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_FRONT_RIGHT;

+      if (att[BUFFER_BACK_RIGHT].Renderbuffer)

+         mask |= BUFFER_BIT_BACK_RIGHT;

+      break;

+   default:

+      if (drawbuffer < 0 || drawbuffer >= (GLint)ctx->Const.MaxDrawBuffers) {

+         mask = INVALID_MASK;

+      }

+      else if (att[BUFFER_COLOR0 + drawbuffer].Renderbuffer) {

+         mask |= (BUFFER_BIT_COLOR0 << drawbuffer);

+      }

+   }

+

+   return mask;

+}

+

+

+

+/**

+ * New in GL 3.0

+ * Clear signed integer color buffer or stencil buffer (not depth).

+ */

+void GLAPIENTRY

+_mesa_ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint *value)

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   FLUSH_CURRENT(ctx, 0);

+

+   if (ctx->NewState) {

+      _mesa_update_state( ctx );

+   }

+

+   switch (buffer) {

+   case GL_STENCIL:

+      if (drawbuffer != 0) {

+         _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",

+                     drawbuffer);

+         return;

+      }

+      else {

+         /* Save current stencil clear value, set to 'value', do the

+          * stencil clear and restore the clear value.

+          * XXX in the future we may have a new ctx->Driver.ClearBuffer()

+          * hook instead.

+          */

+         const GLuint clearSave = ctx->Stencil.Clear;

+         ctx->Stencil.Clear = *value;

+         if (ctx->Driver.ClearStencil)

+            ctx->Driver.ClearStencil(ctx, *value);

+         ctx->Driver.Clear(ctx, BUFFER_BIT_STENCIL);

+         ctx->Stencil.Clear = clearSave;

+         if (ctx->Driver.ClearStencil)

+            ctx->Driver.ClearStencil(ctx, clearSave);

+      }

+      break;

+   case GL_COLOR:

+      {

+         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);

+         if (mask == INVALID_MASK) {

+            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferiv(drawbuffer=%d)",

+                        drawbuffer);

+            return;

+         }

+         else if (mask) {

+            /* XXX note: we're putting the integer clear values into the

+             * floating point state var.  This will not always work.  We'll

+             * need a new ctx->Driver.ClearBuffer() hook....

+             */

+            GLclampf clearSave[4];

+            /* save color */

+            COPY_4V(clearSave, ctx->Color.ClearColor);

+            /* set color */

+            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);

+            /* clear buffer(s) */

+            ctx->Driver.Clear(ctx, mask);

+            /* restore color */

+            COPY_4V(ctx->Color.ClearColor, clearSave);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, clearSave);

+         }

+      }

+      break;

+   default:

+      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferiv(buffer=%s)",

+                  _mesa_lookup_enum_by_nr(buffer));

+      return;

+   }

+}

+

+

+/**

+ * New in GL 3.0

+ * Clear unsigned integer color buffer (not depth, not stencil).

+ */

+void GLAPIENTRY

+_mesa_ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint *value)

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   FLUSH_CURRENT(ctx, 0);

+

+   if (ctx->NewState) {

+      _mesa_update_state( ctx );

+   }

+

+   switch (buffer) {

+   case GL_COLOR:

+      {

+         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);

+         if (mask == INVALID_MASK) {

+            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferuiv(drawbuffer=%d)",

+                        drawbuffer);

+            return;

+         }

+         else if (mask) {

+            /* XXX note: we're putting the uint clear values into the

+             * floating point state var.  This will not always work.  We'll

+             * need a new ctx->Driver.ClearBuffer() hook....

+             */

+            GLclampf clearSave[4];

+            /* save color */

+            COPY_4V(clearSave, ctx->Color.ClearColor);

+            /* set color */

+            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);

+            /* clear buffer(s) */

+            ctx->Driver.Clear(ctx, mask);

+            /* restore color */

+            COPY_4V(ctx->Color.ClearColor, clearSave);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, clearSave);

+         }

+      }

+      break;

+   default:

+      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferuiv(buffer=%s)",

+                  _mesa_lookup_enum_by_nr(buffer));

+      return;

+   }

+}

+

+

+/**

+ * New in GL 3.0

+ * Clear fixed-pt or float color buffer or depth buffer (not stencil).

+ */

+void GLAPIENTRY

+_mesa_ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat *value)

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   FLUSH_CURRENT(ctx, 0);

+

+   if (ctx->NewState) {

+      _mesa_update_state( ctx );

+   }

+

+   switch (buffer) {

+   case GL_DEPTH:

+      if (drawbuffer != 0) {

+         _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",

+                     drawbuffer);

+         return;

+      }

+      else {

+         /* Save current depth clear value, set to 'value', do the

+          * depth clear and restore the clear value.

+          * XXX in the future we may have a new ctx->Driver.ClearBuffer()

+          * hook instead.

+          */

+         const GLclampd clearSave = ctx->Depth.Clear;

+         ctx->Depth.Clear = *value;

+         if (ctx->Driver.ClearDepth)

+            ctx->Driver.ClearDepth(ctx, *value);

+         ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH);

+         ctx->Depth.Clear = clearSave;

+         if (ctx->Driver.ClearDepth)

+            ctx->Driver.ClearDepth(ctx, clearSave);

+      }

+      /* clear depth buffer to value */

+      break;

+   case GL_COLOR:

+      {

+         const GLbitfield mask = make_color_buffer_mask(ctx, drawbuffer);

+         if (mask == INVALID_MASK) {

+            _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfv(drawbuffer=%d)",

+                        drawbuffer);

+            return;

+         }

+         else if (mask) {

+            GLclampf clearSave[4];

+            /* save color */

+            COPY_4V(clearSave, ctx->Color.ClearColor);

+            /* set color */

+            COPY_4V_CAST(ctx->Color.ClearColor, value, GLclampf);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, ctx->Color.ClearColor);

+            /* clear buffer(s) */

+            ctx->Driver.Clear(ctx, mask);

+            /* restore color */

+            COPY_4V(ctx->Color.ClearColor, clearSave);

+            if (ctx->Driver.ClearColor)

+               ctx->Driver.ClearColor(ctx, clearSave);

+         }

+      }

+      break;

+   default:

+      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfv(buffer=%s)",

+                  _mesa_lookup_enum_by_nr(buffer));

+      return;

+   }

+}

+

+

+/**

+ * New in GL 3.0

+ * Clear depth/stencil buffer only.

+ */

+void GLAPIENTRY

+_mesa_ClearBufferfi(GLenum buffer, GLint drawbuffer,

+                    GLfloat depth, GLint stencil)

+{

+   GET_CURRENT_CONTEXT(ctx);

+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

+

+   FLUSH_CURRENT(ctx, 0);

+

+   if (buffer != GL_DEPTH_STENCIL) {

+      _mesa_error(ctx, GL_INVALID_ENUM, "glClearBufferfi(buffer=%s)",

+                  _mesa_lookup_enum_by_nr(buffer));

+      return;

+   }

+

+   if (drawbuffer != 0) {

+      _mesa_error(ctx, GL_INVALID_VALUE, "glClearBufferfi(drawbuffer=%d)",

+                  drawbuffer);

+      return;

+   }

+

+   if (ctx->NewState) {

+      _mesa_update_state( ctx );

+   }

+

+   {

+      /* save current clear values */

+      const GLclampd clearDepthSave = ctx->Depth.Clear;

+      const GLuint clearStencilSave = ctx->Stencil.Clear;

+

+      /* set new clear values */

+      ctx->Depth.Clear = depth;

+      ctx->Stencil.Clear = stencil;

+      if (ctx->Driver.ClearDepth)

+         ctx->Driver.ClearDepth(ctx, depth);

+      if (ctx->Driver.ClearStencil)

+         ctx->Driver.ClearStencil(ctx, stencil);

+

+      /* clear buffers */

+      ctx->Driver.Clear(ctx, BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL);

+

+      /* restore */

+      ctx->Depth.Clear = clearDepthSave;

+      ctx->Stencil.Clear = clearStencilSave;

+      if (ctx->Driver.ClearDepth)

+         ctx->Driver.ClearDepth(ctx, clearDepthSave);

+      if (ctx->Driver.ClearStencil)

+         ctx->Driver.ClearStencil(ctx, clearStencilSave);

+   }

+}