mesa: Fix RGBBuffers for renderbuffers with sized internal formats

For texture attachments, 'f' is texImg->_BaseFormat, but for
renderbuffer attachments, 'f' is att->Renderbuffer->InternalFormat.

InternalFormat may be something like GL_RGB8, which causes our
(f == GL_RGB) check to fail.  Switch to using a proper _BaseFormat,
which drops the size.

Fixes dEQP-GLES31.functional.draw_buffers_indexed.random.
max_required_draw_buffers.15 on iris when combined with a driver fix.

Reviewed-by: Tapani Pälli <[email protected]>
Reviewed-by: Timur Kristóf <[email protected]>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mesa/main/fbobject.c b/src/mesa/main/fbobject.c
index 1298e09e1b0..047ef4ee395 100644
--- a/src/mesa/main/fbobject.c
+++ b/src/mesa/main/fbobject.c
@@ -1014,6 +1014,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
    for (i = -2; i < (GLint) ctx->Const.MaxColorAttachments; i++) {
       struct gl_renderbuffer_attachment *att;
       GLenum f;
+      GLenum baseFormat;
       mesa_format attFormat;
       GLenum att_tex_target = GL_NONE;
 
@@ -1068,6 +1069,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
          minHeight = MIN2(minHeight, texImg->Height);
          maxHeight = MAX2(maxHeight, texImg->Height);
          f = texImg->_BaseFormat;
+         baseFormat = f;
          attFormat = texImg->TexFormat;
          numImages++;
 
@@ -1100,6 +1102,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
          minHeight = MIN2(minHeight, att->Renderbuffer->Height);
          maxHeight = MAX2(minHeight, att->Renderbuffer->Height);
          f = att->Renderbuffer->InternalFormat;
+         baseFormat = att->Renderbuffer->_BaseFormat;
          attFormat = att->Renderbuffer->Format;
          numImages++;
 
@@ -1151,7 +1154,7 @@ _mesa_test_framebuffer_completeness(struct gl_context *ctx,
          if (_mesa_is_format_integer_color(attFormat))
             fb->_IntegerBuffers |= (1 << i);
 
-         if (f == GL_RGB)
+         if (baseFormat == GL_RGB)
             fb->_RGBBuffers |= (1 << i);
 
          if (type == GL_FLOAT && _mesa_get_format_max_bits(attFormat) > 16)