Commit c664601d17949a03a77f03f4fbfd007ebea9ccf0
2021-04-26T17:08:06
Allow drawing if a fragment shader isn't present According to the OpenGL ES 3.1 spec: 7.3 PROGRAM OBJECTS If there is no active program for the vertex or fragment shader stages, the results of vertex and fragment shader execution will respectively be undefined. If there isn't an active program for only one of these shader stages, the results of the other shader stage are still defined. To handle this, we no longer no-op the draw call if one of these is missing. We only no-op the draw if there's no vs. This allows for transform feedback to be captured when there's only a geometry and vertex shader. Tests: KHR-GLES32.core.geometry_shader.api.program_pipeline_vs_gs_capture Tests: KHR-GLES32.core.separable_programs_tf.geometry_active Tests: ProgramPipelineTest31.PipelineWithoutVertexShader* Tests: ProgramPipelineTest31.PipelineWithoutShaders* Bug: angleproject:5579 Change-Id: If9849cc398c307232435b167ab12431fa4258201 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2906723 Commit-Queue: Brandon Schade <b.schade@samsung.com> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>