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rhi: gl: Destructure mat3 correctly

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As per std140 packing rules.

Change-Id: I85663d36a9fa617ea387e8f201677471b2ebd948
Fixes: QTBUG-80655
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
This commit is contained in:
Laszlo Agocs 2019-12-10 10:43:53 +01:00
parent 979b9335e5
commit 53804f553d
1 changed files with 9 additions and 1 deletions
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10
src/gui/rhi/qrhigles2.cpp
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@ -2428,7 +2428,15 @@ void QRhiGles2::bindShaderResources(QRhiGraphicsPipeline *maybeGraphicsPs, QRhiC
f->glUniformMatrix2fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(src));
break;
case QShaderDescription::Mat3:
f->glUniformMatrix3fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(src));
{
// 4 floats per column (or row, if row-major)
float mat[9];
const float *srcMat = reinterpret_cast<const float *>(src);
memcpy(mat, srcMat, 3 * sizeof(float));
memcpy(mat + 3, srcMat + 4, 3 * sizeof(float));
memcpy(mat + 6, srcMat + 8, 3 * sizeof(float));
f->glUniformMatrix3fv(uniform.glslLocation, 1, GL_FALSE, mat);
}
break;
case QShaderDescription::Mat4:
f->glUniformMatrix4fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(src));