i965/fs: Remove direct fs_visitor brw_wm_prog_key dependence

Instead we store a void pointer to the key, and cast it to
brw_wm_prog_key for fragment shader specific code paths.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -1009,6 +1009,8 @@ fs_visitor::setup_builtin_uniform_values(ir_variable *ir)
 fs_reg *
 fs_visitor::emit_fragcoord_interpolation(ir_variable *ir)
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    fs_reg *reg = new(this->mem_ctx) fs_reg(this, ir->type);
    fs_reg wpos = *reg;
    bool flip = !ir->data.origin_upper_left ^ key->render_to_fbo;
@@ -1098,6 +1100,7 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
 
    assert(stage == MESA_SHADER_FRAGMENT);
    brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
 
    unsigned int array_elements;
    const glsl_type *type;
@@ -1234,6 +1237,8 @@ fs_visitor::emit_frontfacing_interpolation()
 void
 fs_visitor::compute_sample_position(fs_reg dst, fs_reg int_sample_pos)
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    assert(dst.type == BRW_REGISTER_TYPE_F);
 
    if (key->compute_pos_offset) {
@@ -1303,6 +1308,8 @@ fs_visitor::emit_samplepos_setup()
 fs_reg *
 fs_visitor::emit_sampleid_setup(ir_variable *ir)
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    assert(brw->gen >= 6);
 
    this->current_annotation = "compute sample id";
@@ -1505,6 +1512,7 @@ fs_visitor::calculate_urb_setup()
 {
    assert(stage == MESA_SHADER_FRAGMENT);
    brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
 
    for (unsigned int i = 0; i < VARYING_SLOT_MAX; i++) {
       prog_data->urb_setup[i] = -1;
@@ -3104,6 +3112,7 @@ fs_visitor::setup_payload_gen6()
 
    if (stage == MESA_SHADER_FRAGMENT) {
       brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
+      brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
       prog_data->uses_pos_offset = key->compute_pos_offset;
       /* R31: MSAA position offsets. */
       if (prog_data->uses_pos_offset) {
@@ -3136,6 +3145,7 @@ fs_visitor::assign_binding_table_offsets()
 {
    assert(stage == MESA_SHADER_FRAGMENT);
    brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    uint32_t next_binding_table_offset = 0;
 
    /* If there are no color regions, we still perform an FB write to a null
@@ -3225,7 +3235,10 @@ fs_visitor::run()
       bool uses_kill =
          (stage == MESA_SHADER_FRAGMENT) &&
          ((brw_wm_prog_data*) this->prog_data)->uses_kill;
-      if (uses_kill || key->alpha_test_func) {
+      bool alpha_test_func =
+         (stage == MESA_SHADER_FRAGMENT) &&
+         ((brw_wm_prog_key*) this->key)->alpha_test_func;
+      if (uses_kill || alpha_test_func) {
          fs_inst *discard_init = emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
          discard_init->flag_subreg = 1;
       }
@@ -3248,7 +3261,7 @@ fs_visitor::run()
 
       emit(FS_OPCODE_PLACEHOLDER_HALT);
 
-      if (key->alpha_test_func)
+      if (alpha_test_func)
          emit_alpha_test();
 
       emit_fb_writes();

src/mesa/drivers/dri/i965/brw_fs.h

@@ -469,7 +469,7 @@ public:
 
    void visit_atomic_counter_intrinsic(ir_call *ir);
 
-   const struct brw_wm_prog_key *const key;
+   const void *const key;
    struct brw_stage_prog_data *prog_data;
    unsigned int sanity_param_count;
 

src/mesa/drivers/dri/i965/brw_fs_fp.cpp

@@ -633,6 +633,9 @@ fs_visitor::setup_fp_regs()
 fs_reg
 fs_visitor::get_fp_dst_reg(const prog_dst_register *dst)
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
+
    switch (dst->File) {
    case PROGRAM_TEMPORARY:
       return fp_temp_regs[dst->Index];

src/mesa/drivers/dri/i965/brw_fs_visitor.cpp

@@ -77,6 +77,8 @@ fs_visitor::visit(ir_variable *ir)
          this->do_dual_src = true;
       } else if (ir->data.location == FRAG_RESULT_COLOR) {
 	 /* Writing gl_FragColor outputs to all color regions. */
+         assert(stage == MESA_SHADER_FRAGMENT);
+         brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
 	 for (unsigned int i = 0; i < MAX2(key->nr_color_regions, 1); i++) {
 	    this->outputs[i] = *reg;
 	    this->output_components[i] = 4;
@@ -355,6 +357,9 @@ fs_visitor::emit_interpolate_expression(ir_expression *ir)
     */
    no16("interpolate_at_* not yet supported in SIMD16 mode.");
 
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
+
    ir_dereference * deref = ir->operands[0]->as_dereference();
    ir_swizzle * swiz = NULL;
    if (!deref) {
@@ -1666,7 +1671,7 @@ fs_visitor::rescale_texcoord(ir_texture *ir, fs_reg coordinate,
    fs_reg scale_x, scale_y;
    const struct brw_sampler_prog_key_data *tex =
       (stage == MESA_SHADER_FRAGMENT) ?
-      &this->key->tex : NULL;
+      &((brw_wm_prog_key*) this->key)->tex : NULL;
    assert(tex);
 
    /* The 965 requires the EU to do the normalization of GL rectangle
@@ -1811,7 +1816,7 @@ fs_visitor::visit(ir_texture *ir)
 {
    const struct brw_sampler_prog_key_data *tex =
       (stage == MESA_SHADER_FRAGMENT) ?
-      &this->key->tex : NULL;
+      &((brw_wm_prog_key*) this->key)->tex : NULL;
    assert(tex);
    fs_inst *inst = NULL;
 
@@ -2035,7 +2040,7 @@ fs_visitor::gather_channel(ir_texture *ir, uint32_t sampler)
 {
    const struct brw_sampler_prog_key_data *tex =
       (stage == MESA_SHADER_FRAGMENT) ?
-      &this->key->tex : NULL;
+      &((brw_wm_prog_key*) this->key)->tex : NULL;
    assert(tex);
    ir_constant *chan = ir->lod_info.component->as_constant();
    int swiz = GET_SWZ(tex->swizzles[sampler], chan->value.i[0]);
@@ -2079,7 +2084,7 @@ fs_visitor::swizzle_result(ir_texture *ir, fs_reg orig_val, uint32_t sampler)
 
    const struct brw_sampler_prog_key_data *tex =
       (stage == MESA_SHADER_FRAGMENT) ?
-      &this->key->tex : NULL;
+      &((brw_wm_prog_key*) this->key)->tex : NULL;
    assert(tex);
 
    if (ir->type == glsl_type::float_type) {
@@ -2955,6 +2960,8 @@ fs_visitor::emit_interpolation_setup_gen6()
 void
 fs_visitor::emit_color_write(int target, int index, int first_color_mrf)
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    int reg_width = dispatch_width / 8;
    fs_inst *inst;
    fs_reg color = outputs[target];
@@ -3051,6 +3058,8 @@ cond_for_alpha_func(GLenum func)
 void
 fs_visitor::emit_alpha_test()
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
    this->current_annotation = "Alpha test";
 
    fs_inst *cmp;
@@ -3081,6 +3090,7 @@ fs_visitor::emit_fb_writes()
 {
    assert(stage == MESA_SHADER_FRAGMENT);
    brw_wm_prog_data *prog_data = (brw_wm_prog_data*) this->prog_data;
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
 
    this->current_annotation = "FB write header";
    bool header_present = true;

src/mesa/drivers/dri/i965/brw_wm_iz.cpp

@@ -122,11 +122,12 @@ static const struct {
  */
 void fs_visitor::setup_payload_gen4()
 {
+   assert(stage == MESA_SHADER_FRAGMENT);
+   brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
+   gl_fragment_program *fp = (gl_fragment_program*) prog;
    GLuint reg = 2;
    bool kill_stats_promoted_workaround = false;
    int lookup = key->iz_lookup;
-   assert(stage == MESA_SHADER_FRAGMENT);
-   gl_fragment_program *fp = (gl_fragment_program*) prog;
    bool uses_depth =
       (fp->Base.InputsRead & (1 << VARYING_SLOT_POS)) != 0;