gl_rasterizer: Implement RASTERIZE_ENABLE

RASTERIZE_ENABLE is the opposite of GL_RASTERIZER_DISCARD. Implement it
naturally using this.

NVN games expect rasterize to be enabled by default, reflect that in our
initial GPU state.

src/video_core/engines/maxwell_3d.cpp

@@ -88,11 +88,11 @@ void Maxwell3D::InitializeRegisterDefaults() {
         color_mask.A.Assign(1);
     }
 
-    // Commercial games seem to assume this value is enabled and nouveau sets this value manually.
+    // NVN games expect these values to be enabled at boot
+    regs.rasterize_enable = 1;
     regs.rt_separate_frag_data = 1;
-
-    // Some games (like Super Mario Odyssey) assume that SRGB is enabled.
     regs.framebuffer_srgb = 1;
+
     mme_inline[MAXWELL3D_REG_INDEX(draw.vertex_end_gl)] = true;
     mme_inline[MAXWELL3D_REG_INDEX(draw.vertex_begin_gl)] = true;
     mme_inline[MAXWELL3D_REG_INDEX(vertex_buffer.count)] = true;

src/video_core/engines/maxwell_3d.h

@@ -657,7 +657,11 @@ public:
                 std::array<f32, 4> tess_level_outer;
                 std::array<f32, 2> tess_level_inner;
 
-                INSERT_UNION_PADDING_WORDS(0x102);
+                INSERT_UNION_PADDING_WORDS(0x10);
+
+                u32 rasterize_enable;
+
+                INSERT_UNION_PADDING_WORDS(0xF1);
 
                 u32 tfb_enabled;
 
@@ -1420,6 +1424,7 @@ ASSERT_REG_POSITION(sync_info, 0xB2);
 ASSERT_REG_POSITION(tess_mode, 0xC8);
 ASSERT_REG_POSITION(tess_level_outer, 0xC9);
 ASSERT_REG_POSITION(tess_level_inner, 0xCD);
+ASSERT_REG_POSITION(rasterize_enable, 0xDF);
 ASSERT_REG_POSITION(tfb_enabled, 0x1D1);
 ASSERT_REG_POSITION(rt, 0x200);
 ASSERT_REG_POSITION(viewport_transform, 0x280);

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -514,6 +514,7 @@ void RasterizerOpenGL::Clear() {
     ConfigureClearFramebuffer(clear_state, use_color, use_depth, use_stencil);
 
     SyncViewport(clear_state);
+    SyncRasterizeEnable(clear_state);
     if (regs.clear_flags.scissor) {
         SyncScissorTest(clear_state);
     }
@@ -541,6 +542,7 @@ void RasterizerOpenGL::Clear() {
 void RasterizerOpenGL::DrawPrelude() {
     auto& gpu = system.GPU().Maxwell3D();
 
+    SyncRasterizeEnable(state);
     SyncColorMask();
     SyncFragmentColorClampState();
     SyncMultiSampleState();
@@ -1133,6 +1135,11 @@ void RasterizerOpenGL::SyncStencilTestState() {
     }
 }
 
+void RasterizerOpenGL::SyncRasterizeEnable(OpenGLState& current_state) {
+    const auto& regs = system.GPU().Maxwell3D().regs;
+    current_state.rasterizer_discard = regs.rasterize_enable == 0;
+}
+
 void RasterizerOpenGL::SyncColorMask() {
     auto& maxwell3d = system.GPU().Maxwell3D();
     if (!maxwell3d.dirty.color_mask) {

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -168,6 +168,9 @@ private:
     /// Syncs the point state to match the guest state
     void SyncPointState();
 
+    /// Syncs the rasterizer enable state to match the guest state
+    void SyncRasterizeEnable(OpenGLState& current_state);
+
     /// Syncs Color Mask
     void SyncColorMask();
 

src/video_core/renderer_opengl/gl_state.cpp

@@ -182,6 +182,10 @@ void OpenGLState::ApplyCulling() {
     }
 }
 
+void OpenGLState::ApplyRasterizerDiscard() {
+    Enable(GL_RASTERIZER_DISCARD, cur_state.rasterizer_discard, rasterizer_discard);
+}
+
 void OpenGLState::ApplyColorMask() {
     if (!dirty.color_mask) {
         return;
@@ -455,6 +459,7 @@ void OpenGLState::Apply() {
     ApplyPointSize();
     ApplyFragmentColorClamp();
     ApplyMultisample();
+    ApplyRasterizerDiscard();
     ApplyColorMask();
     ApplyDepthClamp();
     ApplyViewport();

src/video_core/renderer_opengl/gl_state.h

@@ -48,6 +48,8 @@ public:
         GLuint index = 0;
     } primitive_restart; // GL_PRIMITIVE_RESTART
 
+    bool rasterizer_discard = false; // GL_RASTERIZER_DISCARD
+
     struct ColorMask {
         GLboolean red_enabled = GL_TRUE;
         GLboolean green_enabled = GL_TRUE;
@@ -56,6 +58,7 @@ public:
     };
     std::array<ColorMask, Tegra::Engines::Maxwell3D::Regs::NumRenderTargets>
         color_mask; // GL_COLOR_WRITEMASK
+
     struct {
         bool test_enabled = false; // GL_STENCIL_TEST
         struct {
@@ -174,6 +177,7 @@ public:
     void ApplyMultisample();
     void ApplySRgb();
     void ApplyCulling();
+    void ApplyRasterizerDiscard();
     void ApplyColorMask();
     void ApplyDepth();
     void ApplyPrimitiveRestart();