mesa: convert mesa_bind_buffer_range_transform_feedback() to a validate function

This allows some tidy up and also makes it so we can add KHR_no_error
support.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

src/mesa/main/bufferobj.c

@@ -4029,10 +4029,14 @@ _mesa_BindBufferRange(GLenum target, GLuint index,
 
    switch (target) {
    case GL_TRANSFORM_FEEDBACK_BUFFER:
-      _mesa_bind_buffer_range_transform_feedback(ctx,
-                                                 ctx->TransformFeedback.CurrentObject,
-                                                 index, bufObj, offset, size,
-                                                 false);
+      if (!_mesa_validate_buffer_range_xfb(ctx,
+                                           ctx->TransformFeedback.CurrentObject,
+                                           index, bufObj, offset, size,
+                                           false))
+         return;
+
+      _mesa_bind_buffer_range_xfb(ctx, ctx->TransformFeedback.CurrentObject,
+                                  index, bufObj, offset, size);
       return;
    case GL_UNIFORM_BUFFER:
       bind_buffer_range_uniform_buffer_err(ctx, index, bufObj, offset, size);

src/mesa/main/transformfeedback.c

@@ -541,19 +541,16 @@ bind_buffer_range(struct gl_context *ctx,
 
 
 /**
- * Specify a buffer object to receive transform feedback results.  Plus,
- * specify the starting offset to place the results, and max size.
+ * Validate the buffer object to receive transform feedback results.  Plus,
+ * validate the starting offset to place the results, and max size.
  * Called from the glBindBufferRange() and glTransformFeedbackBufferRange
  * functions.
  */
-void
-_mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
-                                           struct gl_transform_feedback_object *obj,
-                                           GLuint index,
-                                           struct gl_buffer_object *bufObj,
-                                           GLintptr offset,
-                                           GLsizeiptr size,
-                                           bool dsa)
+bool
+_mesa_validate_buffer_range_xfb(struct gl_context *ctx,
+                                struct gl_transform_feedback_object *obj,
+                                GLuint index, struct gl_buffer_object *bufObj,
+                                GLintptr offset, GLsizeiptr size, bool dsa)
 {
    const char *gl_methd_name;
    if (dsa)
@@ -565,7 +562,7 @@ _mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
    if (obj->Active) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "%s(transform feedback active)",
                   gl_methd_name);
-      return;
+      return false;
    }
 
    if (index >= ctx->Const.MaxTransformFeedbackBuffers) {
@@ -575,21 +572,21 @@ _mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
        */
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%d out of bounds)",
                   gl_methd_name, index);
-      return;
+      return false;
    }
 
    if (size & 0x3) {
       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be a multiple of "
                   "four)", gl_methd_name, (int) size);
-      return;
+      return false;
    }  
 
    if (offset & 0x3) {
       /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be a multiple "
                   "of four)", gl_methd_name, (int) offset);
-      return;
+      return false;
    }
 
    if (offset < 0) {
@@ -602,7 +599,7 @@ _mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(offset=%d must be >= 0)",
                   gl_methd_name,
                   (int) offset);
-      return;
+      return false;
    }
 
    if (size <= 0 && (dsa || bufObj != ctx->Shared->NullBufferObj)) {
@@ -616,10 +613,10 @@ _mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
        */
       _mesa_error(ctx, GL_INVALID_VALUE, "%s(size=%d must be > 0)",
                   gl_methd_name, (int) size);
-      return;
+      return false;
    }
 
-   bind_buffer_range(ctx, obj, index, bufObj, offset, size, dsa);
+   return true;
 }
 
 
@@ -743,8 +740,13 @@ _mesa_TransformFeedbackBufferRange(GLuint xfb, GLuint index, GLuint buffer,
       return;
    }
 
-   _mesa_bind_buffer_range_transform_feedback(ctx, obj, index, bufObj, offset,
-                                              size, true);
+   if (!_mesa_validate_buffer_range_xfb(ctx, obj, index, bufObj, offset,
+                                        size, true))
+      return;
+
+   /* The per-attribute binding point */
+   _mesa_set_transform_feedback_binding(ctx, obj, index, bufObj, offset,
+                                        size);
 }
 
 /**
@@ -798,7 +800,7 @@ _mesa_BindBufferOffsetEXT(GLenum target, GLuint index, GLuint buffer,
       return;
    }
 
-   bind_buffer_range(ctx, obj, index, bufObj, offset, 0, false);
+   _mesa_bind_buffer_range_xfb(ctx, obj, index, bufObj, offset, 0);
 }
 
 

src/mesa/main/transformfeedback.h

@@ -63,13 +63,11 @@ _mesa_BeginTransformFeedback(GLenum mode);
 extern void GLAPIENTRY
 _mesa_EndTransformFeedback(void);
 
-extern void
-_mesa_bind_buffer_range_transform_feedback(struct gl_context *ctx,
-					   struct gl_transform_feedback_object *obj,
-					   GLuint index,
-					   struct gl_buffer_object *bufObj,
-					   GLintptr offset,
-					   GLsizeiptr size, bool dsa);
+extern bool
+_mesa_validate_buffer_range_xfb(struct gl_context *ctx,
+                                struct gl_transform_feedback_object *obj,
+                                GLuint index, struct gl_buffer_object *bufObj,
+                                GLintptr offset, GLsizeiptr size, bool dsa);
 
 extern void
 _mesa_bind_buffer_base_transform_feedback(struct gl_context *ctx,