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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ARB_program_interface_query: glGetProgramResourceiv() returns wrong value for GL_REFERENCED_BY_*_SHADER prop for GL_UNIFORM for members of an interface block with an instance name"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90397">90397</a>
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<th>Summary</th>
<td>ARB_program_interface_query: glGetProgramResourceiv() returns wrong value for GL_REFERENCED_BY_*_SHADER prop for GL_UNIFORM for members of an interface block with an instance name
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Mesa core
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>siglesias@igalia.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<th>CC</th>
<td>lemody@gmail.com
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<pre>I was doing some testing of GL_BUFFER_VARIABLE <programInterface> parameter in
glGetProgramResourceiv() checking different property queries, because I need
that support for testing my GL_ARB_shader_storage_buffer_object work.
I realized that queries for GL_REFERENCED_BY_*_SHADER
(GL_REFERENCED_BY_VERTEX_SHADER, GL_REFERENCED_BY_FRAGMENT_SHADER...) are not
returning the proper value when the variable is a member of an interface block
with an instance name. This is happening to GL_UNIFORM in current master
branch.
For example: using the following vertex shader,
glGetProgramResourceiv(GL_REFERENCED_BY_VERTEX_SHADER) query for GL_UNIFORM's
"ubo_std140.s[0].b[0]" should return 1 but it returns 0. ATI proprietary driver
returns 1.
#version 330
#extension GL_ARB_uniform_buffer_object : require
struct B {mat2 b[3]; float c;};
layout(row_major, std140) uniform ubo_std140 {
vec4 v;
B s[2];
} a_std140;
in vec4 piglit_vertex;
void main() {
gl_Position = piglit_vertex;
mat2 a = a_std140.s[0].b[0];
gl_Position.x = a[0][0];
}
Tested on Mesa master: abf3fefa1aa734844e0ca8e95e8c3a501909aa33</pre>
</div>
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