meta: Don't pollute the framebuffer namespace

tl;dr: For many types of GL object, we can *NEVER* use the Gen function.

In OpenGL ES (all versions!) and OpenGL compatibility profile,
applications don't have to call Gen functions.  The GL spec is very
clear about how you can mix-and-match generated names and non-generated
names: you can use any name you want for a particular object type until
you call the Gen function for that object type.

Here's the problem scenario:

 - Application calls a meta function that generates a name.  The first
   Gen will probably return 1.

 - Application decides to use the same name for an object of the same
   type without calling Gen.  Many demo programs use names 1, 2, 3,
   etc. without calling Gen.

 - Application calls the meta function again, and the meta function
   replaces the data.  The application's data is lost, and the app
   fails.  Have fun debugging that.

Fixes piglit tests:
    - object-namespace-pollution glGetTexImage-compressed framebuffer
    - object-namespace-pollution glGenerateMipmap framebuffer

Signed-off-by: Ian Romanick <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92363
Reviewed-by: Topi Pohjolainen <[email protected]>

1 files changed, 15 insertions, 19 deletions

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index bf03563954e..ab78f4565da 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -2784,7 +2784,6 @@ copytexsubimage_using_blit_framebuffer(struct gl_context *ctx, GLuint dims,
                                        GLint x, GLint y,
                                        GLsizei width, GLsizei height)
 {
-   GLuint fbo;
    struct gl_framebuffer *drawFb;
    bool success = false;
    GLbitfield mask;
@@ -2793,12 +2792,11 @@ copytexsubimage_using_blit_framebuffer(struct gl_context *ctx, GLuint dims,
    if (!ctx->Extensions.ARB_framebuffer_object)
       return false;
 
-   _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);
-
-   _mesa_CreateFramebuffers(1, &fbo);
-   drawFb = _mesa_lookup_framebuffer(ctx, fbo);
-   assert(drawFb != NULL && drawFb->Name == fbo);
+   drawFb = ctx->Driver.NewFramebuffer(ctx, 0xDEADBEEF);
+   if (drawFb == NULL)
+      return false;
 
+   _mesa_meta_begin(ctx, MESA_META_ALL & ~MESA_META_DRAW_BUFFERS);
    _mesa_bind_framebuffers(ctx, drawFb, ctx->ReadBuffer);
 
    if (rb->_BaseFormat == GL_DEPTH_STENCIL ||
@@ -2850,7 +2848,7 @@ copytexsubimage_using_blit_framebuffer(struct gl_context *ctx, GLuint dims,
    success = mask == 0x0;
 
  out:
-   _mesa_DeleteFramebuffers(1, &fbo);
+   _mesa_reference_framebuffer(&drawFb, NULL);
    _mesa_meta_end(ctx);
    return success;
 }
@@ -2946,7 +2944,7 @@ static void
 meta_decompress_fbo_cleanup(struct decompress_fbo_state *decompress_fbo)
 {
    if (decompress_fbo->fb != NULL) {
-      _mesa_DeleteFramebuffers(1, &decompress_fbo->fb->Name);
+      _mesa_reference_framebuffer(&decompress_fbo->fb, NULL);
       _mesa_reference_renderbuffer(&decompress_fbo->rb, NULL);
    }
 
@@ -3050,8 +3048,6 @@ decompress_texture_image(struct gl_context *ctx,
 
    /* Create/bind FBO/renderbuffer */
    if (decompress_fbo->fb == NULL) {
-      GLuint FBO;
-
       decompress_fbo->rb = ctx->Driver.NewRenderbuffer(ctx, 0xDEADBEEF);
       if (decompress_fbo->rb == NULL) {
          _mesa_meta_end(ctx);
@@ -3060,9 +3056,11 @@ decompress_texture_image(struct gl_context *ctx,
 
       decompress_fbo->rb->RefCount = 1;
 
-      _mesa_CreateFramebuffers(1, &FBO);
-      decompress_fbo->fb = _mesa_lookup_framebuffer(ctx, FBO);
-      assert(decompress_fbo->fb != NULL && decompress_fbo->fb->Name == FBO);
+      decompress_fbo->fb = ctx->Driver.NewFramebuffer(ctx, 0xDEADBEEF);
+      if (decompress_fbo->fb == NULL) {
+         _mesa_meta_end(ctx);
+         return false;
+      }
 
       _mesa_bind_framebuffers(ctx, decompress_fbo->fb, decompress_fbo->fb);
       _mesa_framebuffer_renderbuffer(ctx, ctx->DrawBuffer, GL_COLOR_ATTACHMENT0,
@@ -3518,14 +3516,12 @@ cleartexsubimage_for_zoffset(struct gl_context *ctx,
                              GLint zoffset,
                              const GLvoid *clearValue)
 {
-   GLuint fbo;
    struct gl_framebuffer *drawFb;
    bool success;
 
-   _mesa_CreateFramebuffers(1, &fbo);
-
-   drawFb = _mesa_lookup_framebuffer(ctx, fbo);
-   assert(drawFb != NULL && drawFb->Name == fbo);
+   drawFb = ctx->Driver.NewFramebuffer(ctx, 0xDEADBEEF);
+   if (drawFb == NULL)
+      return false;
 
    _mesa_bind_framebuffers(ctx, drawFb, ctx->ReadBuffer);
 
@@ -3540,7 +3536,7 @@ cleartexsubimage_for_zoffset(struct gl_context *ctx,
       break;
    }
 
-   _mesa_DeleteFramebuffers(1, &fbo);
+   _mesa_reference_framebuffer(&drawFb, NULL);
 
    return success;
 }