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1-------------------------------------------------------------------------
2drawElements Quality Program Test Specification
3-----------------------------------------------
4
5Copyright 2014 The Android Open Source Project
6
7Licensed under the Apache License, Version 2.0 (the "License");
8you may not use this file except in compliance with the License.
9You may obtain a copy of the License at
10
11     http://www.apache.org/licenses/LICENSE-2.0
12
13Unless required by applicable law or agreed to in writing, software
14distributed under the License is distributed on an "AS IS" BASIS,
15WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16See the License for the specific language governing permissions and
17limitations under the License.
18-------------------------------------------------------------------------
19    Separate shader object tests
20
21Tests:
22 + dEQP-GLES31.separate_shader.*
23
24Includes:
25
26 + Single-program and two-program pipelines
27 + Replacement of pipeline stages
28 + Independence of homonymous uniforms and constants in the pipeline's
29   programs
30 + Interface compatibility between shader stages
31 + glProgramUniform on the pipeline's stages
32 + glCreateShaderProgram
33 + glActiveShaderProgram
34 + glBindProgramPipeline vs glUseProgram priority
35 + glGetProgramPipelineiv queries:
36   - GL_ACTIVE_PROGRAM
37   - GL_VERTEX_SHADER
38   - GL_FRAGMENT_SHADER
39
40Excludes:
41
42 + Testing pipeline rendering against a hardware-independent reference
43   renderer
44
45
46The "api.current_program_priority" test case checks that a bound pipeline
47has no effect when there is a current program. The test creates a program
48pipeline and a differently behaving monolithic program. It then calls
49glUseProgram and and glBindProgramPipeline and draws a triangle. The
50resulting image is compared to a reference image drawn with the program
51but without a bound program pipeline.
52
53The "api.active_program_uniform" test case creates a pipeline and a
54program, binds the pipeline and sets that program as the pipeline's active
55program. After this, glUniform is called and a triangle is drawn. The
56resulting image is compared to a reference image from a similar program
57whose uniform was set after glUseProgram.
58
59The "api.pipeline_programs" test case checks that glGetProgramPipelineiv
60returns the correct programs for vertex and shader stages.
61
62The "api.pipeline_active" test case checks that glGetProgramPipelineiv
63returns the program that was set as the pipeline's active program.
64
65
66The following tests create a program pipeline with one or two programs,
67and then possibly replace either or both of the stages with a new
68single-shader program. A triangle is drawn with the pipeline and the
69result is compared to a triangle drawn with an equivalent monolithic
70program.
71
72In the "pipeline.*" test cases the shaders have uniforms or constants, but
73no varyings. The variables in distinct programs may have the same name.
74
75In the "program_uniform.*" test cases the shaders have uniforms which are
76set with glProgramUniform.
77
78In the "create_shader_program.*" test cases the single-shader programs in
79the pipeline are created with glCreateShaderProgram.
80
81In the "interface.*" test cases there is a varying between the vertex and
82fragment shaders. The declarations of the vertex output and fragment input
83variables may have different qualifiers or names.
84
85The "random.*" test cases create random pipeline configurations that mix
86properties of the previous test case groups. The shaders may have zero,
87one or more varyings. The values of different varyings are rendered as
88diagonal stripes in the drawn triangle.
89