video_core/engines/maxwell_3d: Simplify for loops into ranged for loops within InitializeRegisterDefaults()

Lessens the amount of code that needs to be read, and gets rid of the
need to introduce an indexing variable. Instead, we just operate on the
objects directly.

src/video_core/engines/maxwell_3d.cpp

@@ -34,9 +34,9 @@ void Maxwell3D::InitializeRegisterDefaults() {
 
     // Depth range near/far is not always set, but is expected to be the default 0.0f, 1.0f. This is
     // needed for ARMS.
-    for (std::size_t viewport{}; viewport < Regs::NumViewports; ++viewport) {
-        regs.viewports[viewport].depth_range_near = 0.0f;
-        regs.viewports[viewport].depth_range_far = 1.0f;
+    for (auto& viewport : regs.viewports) {
+        viewport.depth_range_near = 0.0f;
+        viewport.depth_range_far = 1.0f;
     }
 
     // Doom and Bomberman seems to use the uninitialized registers and just enable blend
@@ -47,13 +47,13 @@ void Maxwell3D::InitializeRegisterDefaults() {
     regs.blend.equation_a = Regs::Blend::Equation::Add;
     regs.blend.factor_source_a = Regs::Blend::Factor::One;
     regs.blend.factor_dest_a = Regs::Blend::Factor::Zero;
-    for (std::size_t blend_index = 0; blend_index < Regs::NumRenderTargets; blend_index++) {
-        regs.independent_blend[blend_index].equation_rgb = Regs::Blend::Equation::Add;
-        regs.independent_blend[blend_index].factor_source_rgb = Regs::Blend::Factor::One;
-        regs.independent_blend[blend_index].factor_dest_rgb = Regs::Blend::Factor::Zero;
-        regs.independent_blend[blend_index].equation_a = Regs::Blend::Equation::Add;
-        regs.independent_blend[blend_index].factor_source_a = Regs::Blend::Factor::One;
-        regs.independent_blend[blend_index].factor_dest_a = Regs::Blend::Factor::Zero;
+    for (auto& blend : regs.independent_blend) {
+        blend.equation_rgb = Regs::Blend::Equation::Add;
+        blend.factor_source_rgb = Regs::Blend::Factor::One;
+        blend.factor_dest_rgb = Regs::Blend::Factor::Zero;
+        blend.equation_a = Regs::Blend::Equation::Add;
+        blend.factor_source_a = Regs::Blend::Factor::One;
+        blend.factor_dest_a = Regs::Blend::Factor::Zero;
     }
     regs.stencil_front_op_fail = Regs::StencilOp::Keep;
     regs.stencil_front_op_zfail = Regs::StencilOp::Keep;
@@ -75,11 +75,11 @@ void Maxwell3D::InitializeRegisterDefaults() {
 
     // TODO(bunnei): Some games do not initialize the color masks (e.g. Sonic Mania). Assuming a
     // default of enabled fixes rendering here.
-    for (std::size_t color_mask = 0; color_mask < Regs::NumRenderTargets; color_mask++) {
-        regs.color_mask[color_mask].R.Assign(1);
-        regs.color_mask[color_mask].G.Assign(1);
-        regs.color_mask[color_mask].B.Assign(1);
-        regs.color_mask[color_mask].A.Assign(1);
+    for (auto& color_mask : regs.color_mask) {
+        color_mask.R.Assign(1);
+        color_mask.G.Assign(1);
+        color_mask.B.Assign(1);
+        color_mask.A.Assign(1);
     }
 
     // Commercial games seem to assume this value is enabled and nouveau sets this value manually.