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diff --git a/dlls/wined3d/glsl_shader.c b/dlls/wined3d/glsl_shader.c
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--- a/dlls/wined3d/glsl_shader.c
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+++ b/dlls/wined3d/glsl_shader.c
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@@ -2457,9 +2457,13 @@
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rel_param0.param_str, reg->idx[0].offset, shader->limits->constant_float,
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prefix, rel_param0.param_str, reg->idx[0].offset);
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else if (reg->idx[0].offset)
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- sprintf(register_name, "%s_c[%s + %u]", prefix, rel_param0.param_str, reg->idx[0].offset);
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+ sprintf(register_name, "(%s + %u >= 0 && %s + %u < %u ? %s_c[%s + %u] : vec4(0.0))",
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+ rel_param0.param_str, reg->idx[0].offset, rel_param0.param_str, reg->idx[0].offset,
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+ shader->limits->constant_float, prefix, rel_param0.param_str, reg->idx[0].offset);
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else
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- sprintf(register_name, "%s_c[%s]", prefix, rel_param0.param_str);
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+ sprintf(register_name, "(%s >= 0 && %s < %u ? %s_c[%s] : vec4(0.0))",
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+ rel_param0.param_str, rel_param0.param_str, shader->limits->constant_float,
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+ prefix, rel_param0.param_str);
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}
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else
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{
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