Author :
Brandon Schade
Date :
2021-04-26 17:08:06
Hash :c664601d Message :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>
Brandon Schade