Nothing was explicitly checking this.
---
src/mesa/main/buffers.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index 244f4de..065ef2a 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -316,6 +316,16 @@ _mesa_DrawBuffers(GLsizei n, const GLenum *buffers)
supportedMask = supported_buffer_bitmask(ctx, ctx->DrawBuffer);
usedBufferMask = 0x0;
+ /* From the ES 3.0 specification, page 180:
+ * "If the GL is bound to the default framebuffer, then n must be 1
+ * and the constant must be BACK or NONE."
+ */
+ if (_mesa_is_gles3(ctx) && _mesa_is_winsys_fbo(ctx->DrawBuffer) &&
+ (n != 1 || (buffers[0] != GL_NONE && buffers[0] != GL_BACK))) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffers(buffer)");
+ return;
+ }
+
/* complicated error checking... */
for (output = 0; output < n; output++) {
if (buffers[output] == GL_NONE) {
--
1.8.0.2
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