basic work on GL_ARB_vertex_buffer_object

4 files changed, 389 insertions, 8 deletions

diff --git a/src/mesa/main/bufferobj.c b/src/mesa/main/bufferobj.c
index 7742e29a8b..3a7a413e97 100644
--- a/src/mesa/main/bufferobj.c
+++ b/src/mesa/main/bufferobj.c
@@ -1,5 +1,3 @@
-/* $Id: bufferobj.c,v 1.1 2003/03/29 17:01:00 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
  * Version:  5.1
@@ -34,22 +32,51 @@
 
 #include "glheader.h"
 #include "imports.h"
+#include "context.h"
 #include "bufferobj.h"
 
 
 void
 _mesa_BindBufferARB(GLenum target, GLuint buffer)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBindBufferARB(target)");
+      return;
+   }
 }
 
 void
-_mesa_DeleteBuffersARB(GLsizei n, const GLuint * buffer)
+_mesa_DeleteBuffersARB(GLsizei n, const GLuint *buffer)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glDeleteBuffersARB(n)");
+      return;
+   }
+
 }
 
 void
-_mesa_GenBuffersARB(GLsizei n, GLuint * buffer)
+_mesa_GenBuffersARB(GLsizei n, GLuint *buffer)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (n < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGenBuffersARB(n)");
+      return;
+   }
 }
 
 GLboolean
@@ -62,37 +89,188 @@ void
 _mesa_BufferDataARB(GLenum target, GLsizeiptrARB size,
                     const GLvoid * data, GLenum usage)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (size < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBufferDataARB(size < 0)");
+      return;
+   }
+
+   switch (usage) {
+      case GL_STREAM_DRAW_ARB:
+      case GL_STREAM_READ_ARB:
+      case GL_STREAM_COPY_ARB:
+      case GL_STATIC_DRAW_ARB:
+      case GL_STATIC_READ_ARB:
+      case GL_STATIC_COPY_ARB:
+      case GL_DYNAMIC_DRAW_ARB:
+      case GL_DYNAMIC_READ_ARB:
+      case GL_DYNAMIC_COPY_ARB:
+         /* OK */
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glBufferDataARB(usage)");
+         return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBufferDataARB(target)");
+      return;
+   }
 }
 
 void
 _mesa_BufferSubDataARB(GLenum target, GLintptrARB offset,
                        GLsizeiptrARB size, const GLvoid * data)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (size < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glBufferSubDataARB(size < 0)");
+      return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glBufferSubDataARB(target)");
+      return;
+   }
 }
 
 void
 _mesa_GetBufferSubDataARB(GLenum target, GLintptrARB offset,
                           GLsizeiptrARB size, void * data)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (size < 0) {
+      _mesa_error(ctx, GL_INVALID_VALUE, "glGetBufferSubDataARB(size < 0)");
+      return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferSubDataARB(target)");
+      return;
+   }
 }
 
 void
 _mesa_MapBufferARB(GLenum target, GLenum access)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   switch (access) {
+      case GL_READ_ONLY_ARB:
+      case GL_WRITE_ONLY_ARB:
+      case GL_READ_WRITE_ARB:
+         /* OK */
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glMapBufferARB(access)");
+         return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glMapBufferARB(target)");
+      return;
+   }
 }
 
 GLboolean
 _mesa_UnmapBufferARB(GLenum target)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glUnmapBufferARB(target)");
+      return GL_FALSE;
+   }
    return GL_FALSE;
 }
 
 void
 _mesa_GetBufferParameterivARB(GLenum target, GLenum pname, GLint *params)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   switch (pname) {
+      case GL_BUFFER_SIZE_ARB:
+      case GL_BUFFER_USAGE_ARB:
+      case GL_BUFFER_ACCESS_ARB:
+      case GL_BUFFER_MAPPED_ARB:
+         /* ok */
+         break;
+      default:
+         _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameterivARB(pname)");
+         return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferParameterARB(target)");
+      return;
+   }
 }
 
 void
 _mesa_GetBufferPointervARB(GLenum target, GLenum pname, GLvoid **params)
 {
+   GET_CURRENT_CONTEXT(ctx);
+   ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+   if (pname != GL_BUFFER_MAP_POINTER_ARB) {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointervARB(pname)");
+      return;
+   }
+
+   if (target == GL_ARRAY_BUFFER_ARB) {
+
+   }
+   else if (target == GL_ELEMENT_ARRAY_BUFFER_ARB) {
+
+   }
+   else {
+      _mesa_error(ctx, GL_INVALID_ENUM, "glGetBufferPointervARB(target)");
+      return;
+   }
 }
diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index cbbc0d60d0..7b7d00800c 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -1,5 +1,3 @@
-/* $Id: get.c,v 1.110 2003/04/01 19:07:35 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
  * Version:  5.1
@@ -1519,6 +1517,52 @@ _mesa_GetBooleanv( GLenum pname, GLboolean *params )
          *params = ENUM_TO_BOOL(ctx->Stencil.ActiveFace ? GL_BACK : GL_FRONT);
          break;
 
+      /* GL_ARB_vertex_buffer_object */
+      case GL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.ArrayBufferBinding);
+         break;
+      case GL_VERTEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.VertexArrayBufferBinding);
+         break;
+      case GL_NORMAL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.NormalArrayBufferBinding);
+         break;
+      case GL_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.ColorArrayBufferBinding);
+         break;
+      case GL_INDEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.IndexArrayBufferBinding);
+         break;
+      case GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.TextureArrayBufferBinding);
+         break;
+      case GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.EdgeFlagArrayBufferBinding);
+         break;
+      case GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.SecondaryColorArrayBufferBinding);
+         break;
+      case GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.FogCoordArrayBufferBinding);
+         break;
+      case GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.WeightArrayBufferBinding);
+         break;
+      case GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_B(ARB_vertex_buffer_object, pname);
+         *params = INT_TO_BOOL(ctx->Array.ElementArrayBufferBinding);
+         break;
+
       default:
          _mesa_error(ctx, GL_INVALID_ENUM, "glGetBooleanv(pname=0x%x)", pname);
    }
@@ -2929,6 +2973,52 @@ _mesa_GetDoublev( GLenum pname, GLdouble *params )
          *params = (GLdouble) (ctx->Stencil.ActiveFace ? GL_BACK : GL_FRONT);
          break;
 
+      /* GL_ARB_vertex_buffer_object */
+      case GL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.ArrayBufferBinding;
+         break;
+      case GL_VERTEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.VertexArrayBufferBinding;
+         break;
+      case GL_NORMAL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.NormalArrayBufferBinding;
+         break;
+      case GL_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.ColorArrayBufferBinding;
+         break;
+      case GL_INDEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.IndexArrayBufferBinding;
+         break;
+      case GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.TextureArrayBufferBinding;
+         break;
+      case GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.EdgeFlagArrayBufferBinding;
+         break;
+      case GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.SecondaryColorArrayBufferBinding;
+         break;
+      case GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.FogCoordArrayBufferBinding;
+         break;
+      case GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.WeightArrayBufferBinding;
+         break;
+      case GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_D(ARB_vertex_buffer_object, pname);
+         *params = (GLdouble) ctx->Array.ElementArrayBufferBinding;
+         break;
+
       default:
          _mesa_error(ctx, GL_INVALID_ENUM, "glGetDoublev(pname=0x%x)", pname);
    }
@@ -4315,6 +4405,52 @@ _mesa_GetFloatv( GLenum pname, GLfloat *params )
          *params = (GLfloat) (ctx->Stencil.ActiveFace ? GL_BACK : GL_FRONT);
          break;
 
+      /* GL_ARB_vertex_buffer_object */
+      case GL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.ArrayBufferBinding;
+         break;
+      case GL_VERTEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.VertexArrayBufferBinding;
+         break;
+      case GL_NORMAL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.NormalArrayBufferBinding;
+         break;
+      case GL_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.ColorArrayBufferBinding;
+         break;
+      case GL_INDEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.IndexArrayBufferBinding;
+         break;
+      case GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.TextureArrayBufferBinding;
+         break;
+      case GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.EdgeFlagArrayBufferBinding;
+         break;
+      case GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.SecondaryColorArrayBufferBinding;
+         break;
+      case GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.FogCoordArrayBufferBinding;
+         break;
+      case GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.WeightArrayBufferBinding;
+         break;
+      case GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_F(ARB_vertex_buffer_object, pname);
+         *params = (GLfloat) ctx->Array.ElementArrayBufferBinding;
+         break;
+
       default:
          _mesa_error(ctx, GL_INVALID_ENUM, "glGetFloatv(0x%x)", pname);
    }
@@ -5739,6 +5875,52 @@ _mesa_GetIntegerv( GLenum pname, GLint *params )
          *params = (GLint) (ctx->Stencil.ActiveFace ? GL_BACK : GL_FRONT);
          break;
 
+      /* GL_ARB_vertex_buffer_object */
+      case GL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.ArrayBufferBinding;
+         break;
+      case GL_VERTEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.VertexArrayBufferBinding;
+         break;
+      case GL_NORMAL_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.NormalArrayBufferBinding;
+         break;
+      case GL_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.ColorArrayBufferBinding;
+         break;
+      case GL_INDEX_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.IndexArrayBufferBinding;
+         break;
+      case GL_TEXTURE_COORD_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.TextureArrayBufferBinding;
+         break;
+      case GL_EDGE_FLAG_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.EdgeFlagArrayBufferBinding;
+         break;
+      case GL_SECONDARY_COLOR_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.SecondaryColorArrayBufferBinding;
+         break;
+      case GL_FOG_COORDINATE_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.FogCoordArrayBufferBinding;
+         break;
+      case GL_WEIGHT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.WeightArrayBufferBinding;
+         break;
+      case GL_ELEMENT_ARRAY_BUFFER_BINDING_ARB:
+         CHECK_EXTENSION_I(ARB_vertex_buffer_object, pname);
+         *params = (GLint) ctx->Array.ElementArrayBufferBinding;
+         break;
+
       default:
          _mesa_error(ctx, GL_INVALID_ENUM, "glGetIntegerv(pname=0x%x)", pname);
    }
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 8935f0ad73..bd12e772a6 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1093,8 +1093,8 @@ struct gl_array_attrib {
    struct gl_client_array Index;
    struct gl_client_array TexCoord[MAX_TEXTURE_COORD_UNITS];
    struct gl_client_array EdgeFlag;
-
-   struct gl_client_array VertexAttrib[16];  /* GL_NV_vertex_program */
+   /* GL_NV_vertex_program */
+   struct gl_client_array VertexAttrib[VERT_ATTRIB_MAX];
 
    GLint TexCoordInterleaveFactor;
    GLint ActiveTexture;		/* Client Active Texture */
@@ -1103,6 +1103,20 @@ struct gl_array_attrib {
 
    GLuint _Enabled;		/* _NEW_ARRAY_* - bit set if array enabled */
    GLuint NewState;		/* _NEW_ARRAY_* */
+
+   /* GL_ARB_vertex_buffer_object */
+   GLuint ArrayBufferBinding;
+   GLuint VertexArrayBufferBinding;
+   GLuint NormalArrayBufferBinding;
+   GLuint ColorArrayBufferBinding;
+   GLuint IndexArrayBufferBinding;
+   GLuint TextureArrayBufferBinding;
+   GLuint EdgeFlagArrayBufferBinding;
+   GLuint SecondaryColorArrayBufferBinding;
+   GLuint FogCoordArrayBufferBinding;
+   GLuint WeightArrayBufferBinding;
+   GLuint ElementArrayBufferBinding;
+   GLuint VertexAttribArrayBufferBinding[VERT_ATTRIB_MAX];
 };
 
 
diff --git a/src/mesa/main/nvprogram.c b/src/mesa/main/nvprogram.c
index fa125c4099..584b5ad40f 100644
--- a/src/mesa/main/nvprogram.c
+++ b/src/mesa/main/nvprogram.c
@@ -723,6 +723,13 @@ _mesa_GetVertexAttribivNV(GLuint index, GLenum pname, GLint *params)
       case GL_CURRENT_ATTRIB_NV:
          COPY_4V_CAST(params, ctx->Current.Attrib[index], GLint);
          break;
+      case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING_ARB:
+         if (!ctx->Extensions.ARB_vertex_buffer_object) {
+            _mesa_error(ctx, GL_INVALID_ENUM, "glGetVertexAttribdvNV");
+            return;
+         }
+         params[0] = ctx->Array.VertexAttribArrayBufferBinding[index];
+         break;
       default:
          _mesa_error(ctx, GL_INVALID_ENUM, "glGetVertexAttribdvNV");
          return;