+
+static inline GLuint
+_mesa_geometric_nonvalidated_samples(const struct gl_framebuffer *buffer)
+{
+ return buffer->_HasAttachments ?
+ buffer->Visual.samples :
+ buffer->DefaultGeometry.NumSamples;
+}
+
+bool
+_mesa_is_multisample_enabled(const struct gl_context *ctx)
+{
+ /* The sample count may not be validated by the driver, but when it is set,
+ * we know that is in a valid range and no driver should ever validate a
+ * multisampled framebuffer to non-multisampled and vice-versa.
+ */
+ return ctx->Multisample.Enabled &&
+ ctx->DrawBuffer &&
+ _mesa_geometric_nonvalidated_samples(ctx->DrawBuffer) >= 1;
+}
+
+/**
+ * Is alpha testing enabled and applicable to the currently bound
+ * framebuffer?
+ */
+bool
+_mesa_is_alpha_test_enabled(const struct gl_context *ctx)
+{
+ bool buffer0_is_integer = ctx->DrawBuffer->_IntegerBuffers & 0x1;
+ return (ctx->Color.AlphaEnabled && !buffer0_is_integer);
+}
+
+/**
+ * Is alpha to coverage enabled and applicable to the currently bound
+ * framebuffer?
+ */
+bool
+_mesa_is_alpha_to_coverage_enabled(const struct gl_context *ctx)
+{
+ bool buffer0_is_integer = ctx->DrawBuffer->_IntegerBuffers & 0x1;
+ return (ctx->Multisample.SampleAlphaToCoverage &&
+ _mesa_is_multisample_enabled(ctx) &&
+ !buffer0_is_integer);
+}