nir: Make nir_gather_info collect a uses_fddx_fddy flag.
i965 turns fddx/fddy into their coarse/fine variants based on the ctx->Hint.FragmentShaderDerivative setting. It needs to know whether this can impact a shader in order to better guess NOS settings. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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@ -280,11 +280,27 @@ gather_tex_info(nir_tex_instr *instr, nir_shader *shader)
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}
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}
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static void
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gather_alu_info(nir_alu_instr *instr, nir_shader *shader)
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{
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switch (instr->op) {
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case nir_op_fddx:
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case nir_op_fddy:
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shader->info.uses_fddx_fddy = true;
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break;
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default:
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break;
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}
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}
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static void
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gather_info_block(nir_block *block, nir_shader *shader)
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{
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nir_foreach_instr(instr, block) {
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switch (instr->type) {
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case nir_instr_type_alu:
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gather_alu_info(nir_instr_as_alu(instr), shader);
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break;
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case nir_instr_type_intrinsic:
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gather_intrinsic_info(nir_instr_as_intrinsic(instr), shader);
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break;
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@ -73,6 +73,13 @@ typedef struct shader_info {
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/** Bitfield of which textures are used by texelFetch() */
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uint32_t textures_used_by_txf;
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/**
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* True if this shader uses the fddx/fddy opcodes.
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*
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* Note that this does not include the "fine" and "coarse" variants.
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*/
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bool uses_fddx_fddy;
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/* The size of the gl_ClipDistance[] array, if declared. */
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unsigned clip_distance_array_size;
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