i915: Add support for gl_FragData[0] for output color.
We advertised ARB_draw_buffers, but either fell back to software when using this output, or assertion failed. Fixes glsl-fs-fragdata-1, and failures in some webgl conformance tests. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=39024 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34906
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@ -210,6 +210,7 @@ get_result_vector(struct i915_fragment_program *p,
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case PROGRAM_OUTPUT:
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switch (inst->DstReg.Index) {
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case FRAG_RESULT_COLOR:
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case FRAG_RESULT_DATA0:
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return UREG(REG_TYPE_OC, 0);
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case FRAG_RESULT_DEPTH:
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p->depth_written = 1;
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