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Conformance Test
Adam Czupryna, Mobica
Adam Czupryna, Mobica (adam.czupryna 'at'
In review
March 22, 2017 (version 1)
OpenGL 3.1 is required.
ARB_shader_draw_parameters extension is required.
This specification is written against:
- OpenGL 4.3 Core Profile Specification,
- version 4.30 Shading Language Specification,
- ARB_shader_draw_parameters extension Specification.
The ARB_multi_draw_indirect and ARB_indirect_parameters affects
definition of this test.
This test verifies if new GLSL built-in variables added by this
extension contain correct data.
It is expected that:
gl_BaseVertexARB - contain value passed in baseVertex parameter,
gl_BaseInstanceARB - contain value passed in baseInstance parameter.
gl_DrawIDARB - contain the index of the draw currently being
processed by a Multi* variant of drawing command.
Shader Extension Test
* Create shader that require ARB_shader_draw_parameters extension
and check if ARB_shader_draw_parameters is defined and equal 1.
Check if shader compiles with no error.
Draw Paramaters Test
* Create vertex shader that adds offset to currently processed
vertex using gl_baseVertexARB and gl_baseInstanceARB for x and y
dimensions respectively. Additionally color variable which components
are function of gl_DrawIDARB value should be passed to the fragment
Color components function could be:
color.r = (gl_DrawIDARB % 3 == 0 ? 1.0 : 0.0);
color.g = (gl_DrawIDARB % 3 == 1 ? 1.0 : 0.0);
color.b = (gl_DrawIDARB % 3 == 2 ? 1.0 : 0.0);
* Create fragment shader that puts out color passed by vertex shader.
* Set clear color to black, enable blending and perform different
drawing commands to draw triangle strips. Use different parameters
values for each command. Create separated test cases for each drawing
List of drawing commands:
- drawArrays/drawElements
- drawArraysIndirect/drawElementsIndirect
- drawArraysInstanced/drawElementsInstanced
- multiDrawArrays/multiDrawElements
- multiDrawArraysIndirect/multiDrawElementsIndirect
- multiDrawArraysIndirectCountARB/multiDrawElementsIndirectCountARB
Verify if drawing result is as expected by reading pixels from the
framebuffer. Make sure that each triangle is drawn with correct offset
and with proper color value.
Revision History
Revision 1, 22 March, 2017 (Adam Czupryna)
- Initial version.
Revision 2, 3 April, 2017 (Adam Czupryna)
- Changed Draw Parameters Test definition,
- Updated list of drawing commands.