/* emit 0, 0, 0, 1 */ static nir_shader * build_nir_fs(void) { const struct glsl_type *vec4 = glsl_vec4_type(); nir_builder b; nir_variable *f_color; /* vec4, fragment output color */ nir_builder_init_simple_shader(&b, NULL, MESA_SHADER_FRAGMENT, NULL); b.shader->info.name = ralloc_asprintf(b.shader, "meta_resolve_fs"); f_color = nir_variable_create(b.shader, nir_var_shader_out, vec4, "f_color"); f_color->data.location = FRAG_RESULT_DATA0; nir_store_var(&b, f_color, nir_imm_vec4(&b, 0.0, 0.0, 0.0, 1.0), 0xf); return b.shader; }
/* see emit_wpos_adjustment() in st_mesa_to_tgsi.c */ static void emit_wpos_adjustment(lower_wpos_ytransform_state *state, nir_intrinsic_instr *intr, bool invert, float adjX, float adjY[2]) { nir_builder *b = &state->b; nir_variable *fragcoord = intr->variables[0]->var; nir_ssa_def *wpostrans, *wpos_temp, *wpos_temp_y, *wpos_input; assert(intr->dest.is_ssa); b->cursor = nir_before_instr(&intr->instr); wpostrans = get_transform(state); wpos_input = nir_load_var(b, fragcoord); /* First, apply the coordinate shift: */ if (adjX || adjY[0] || adjY[1]) { if (adjY[0] != adjY[1]) { /* Adjust the y coordinate by adjY[1] or adjY[0] respectively * depending on whether inversion is actually going to be applied * or not, which is determined by testing against the inversion * state variable used below, which will be either +1 or -1. */ nir_ssa_def *adj_temp; adj_temp = nir_cmp(b, nir_channel(b, wpostrans, invert ? 2 : 0), nir_imm_vec4(b, adjX, adjY[0], 0.0f, 0.0f), nir_imm_vec4(b, adjX, adjY[1], 0.0f, 0.0f)); wpos_temp = nir_fadd(b, wpos_input, adj_temp); } else { wpos_temp = nir_fadd(b, wpos_input, nir_imm_vec4(b, adjX, adjY[0], 0.0f, 0.0f)); } wpos_input = wpos_temp; } else { /* MOV wpos_temp, input[wpos] */ wpos_temp = wpos_input; } /* Now the conditional y flip: STATE_FB_WPOS_Y_TRANSFORM.xy/zw will be * inversion/identity, or the other way around if we're drawing to an FBO. */ if (invert) { /* wpos_temp.y = wpos_input * wpostrans.xxxx + wpostrans.yyyy */ wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1), nir_channel(b, wpostrans, 0)), nir_channel(b, wpostrans, 1)); } else { /* wpos_temp.y = wpos_input * wpostrans.zzzz + wpostrans.wwww */ wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1), nir_channel(b, wpostrans, 2)), nir_channel(b, wpostrans, 3)); } wpos_temp = nir_vec4(b, nir_channel(b, wpos_temp, 0), wpos_temp_y, nir_channel(b, wpos_temp, 2), nir_channel(b, wpos_temp, 3)); nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(wpos_temp)); }