This reverts commit 644e015f0b.
PrimitiveMode from the program doesn't always hold a valid value that
is neither of GL_TRIANGLES, GL_QUADS nor GL_ISOLINES when reaching
this code. This caused regressions in the following CTS tests:
GL44-CTS.stencil_texturing.functional
GL44-CTS.shading_language_420pack.binding_images
GL44-CTS.shading_language_420pack.binding_samplers
GL44-CTS.shading_language_420pack.binding_uniform_single_block
GL44-CTS.shading_language_420pack.implicit_conversions
GL44-CTS.shading_language_420pack.initializer_list
GL44-CTS.shading_language_420pack.length_of_vector_and_matrix
GL44-CTS.shading_language_420pack.line_continuation
Hence, we rather take it from the linked shader.
Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
Signed-off-by: Andres Gomez <agomez@igalia.com>
c4e47ab971