gl_state: Remove scissor test tracking

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -467,12 +467,10 @@ void RasterizerOpenGL::Clear() {
     SyncViewport(clear_state);
     SyncRasterizeEnable(clear_state);
     if (regs.clear_flags.scissor) {
-        SyncScissorTest(clear_state);
+        SyncScissorTest();
     }
 
-    if (regs.clear_flags.viewport) {
-        clear_state.EmulateViewportWithScissor();
-    }
+    UNIMPLEMENTED_IF(regs.clear_flags.viewport);
 
     clear_state.Apply();
 
@@ -508,7 +506,7 @@ void RasterizerOpenGL::Draw(bool is_indexed, bool is_instanced) {
     SyncLogicOpState();
     SyncCullMode();
     SyncPrimitiveRestart();
-    SyncScissorTest(state);
+    SyncScissorTest();
     SyncTransformFeedback();
     SyncPointState();
     SyncPolygonOffset();
@@ -1140,25 +1138,13 @@ void RasterizerOpenGL::SyncLogicOpState() {
     }
 }
 
-void RasterizerOpenGL::SyncScissorTest(OpenGLState& current_state) {
+void RasterizerOpenGL::SyncScissorTest() {
     const auto& regs = system.GPU().Maxwell3D().regs;
-    const bool geometry_shaders_enabled =
-        regs.IsShaderConfigEnabled(static_cast<size_t>(Maxwell::ShaderProgram::Geometry));
-    const std::size_t viewport_count =
-        geometry_shaders_enabled ? Tegra::Engines::Maxwell3D::Regs::NumViewports : 1;
-    for (std::size_t i = 0; i < viewport_count; i++) {
-        const auto& src = regs.scissor_test[i];
-        auto& dst = current_state.viewports[i].scissor;
-        dst.enabled = (src.enable != 0);
-        if (dst.enabled == 0) {
-            return;
-        }
-        const u32 width = src.max_x - src.min_x;
-        const u32 height = src.max_y - src.min_y;
-        dst.x = src.min_x;
-        dst.y = src.min_y;
-        dst.width = width;
-        dst.height = height;
+    for (std::size_t index = 0; index < Maxwell::NumViewports; ++index) {
+        const auto& src = regs.scissor_test[index];
+        oglEnablei(GL_SCISSOR_TEST, src.enable, static_cast<GLuint>(index));
+        glScissorIndexed(static_cast<GLuint>(index), src.min_x, src.min_y, src.max_x - src.min_x,
+                         src.max_y - src.min_y);
     }
 }
 

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -167,7 +167,7 @@ private:
     void SyncMultiSampleState();
 
     /// Syncs the scissor test state to match the guest state
-    void SyncScissorTest(OpenGLState& current_state);
+    void SyncScissorTest();
 
     /// Syncs the transform feedback state to match the guest state
     void SyncTransformFeedback();

src/video_core/renderer_opengl/gl_state.cpp

@@ -171,19 +171,6 @@ void OpenGLState::ApplyViewport() {
             current.depth_range_far = updated.depth_range_far;
             glDepthRangeIndexed(i, updated.depth_range_near, updated.depth_range_far);
         }
-
-        Enable(GL_SCISSOR_TEST, i, current.scissor.enabled, updated.scissor.enabled);
-
-        if (current.scissor.x != updated.scissor.x || current.scissor.y != updated.scissor.y ||
-            current.scissor.width != updated.scissor.width ||
-            current.scissor.height != updated.scissor.height) {
-            current.scissor.x = updated.scissor.x;
-            current.scissor.y = updated.scissor.y;
-            current.scissor.width = updated.scissor.width;
-            current.scissor.height = updated.scissor.height;
-            glScissorIndexed(i, updated.scissor.x, updated.scissor.y, updated.scissor.width,
-                             updated.scissor.height);
-        }
     }
 }
 
@@ -306,28 +293,6 @@ void OpenGLState::Apply() {
     ApplyRenderBuffer();
 }
 
-void OpenGLState::EmulateViewportWithScissor() {
-    auto& current = viewports[0];
-    if (current.scissor.enabled) {
-        const GLint left = std::max(current.x, current.scissor.x);
-        const GLint right =
-            std::max(current.x + current.width, current.scissor.x + current.scissor.width);
-        const GLint bottom = std::max(current.y, current.scissor.y);
-        const GLint top =
-            std::max(current.y + current.height, current.scissor.y + current.scissor.height);
-        current.scissor.x = std::max(left, 0);
-        current.scissor.y = std::max(bottom, 0);
-        current.scissor.width = std::max(right - left, 0);
-        current.scissor.height = std::max(top - bottom, 0);
-    } else {
-        current.scissor.enabled = true;
-        current.scissor.x = current.x;
-        current.scissor.y = current.y;
-        current.scissor.width = current.width;
-        current.scissor.height = current.height;
-    }
-}
-
 OpenGLState& OpenGLState::UnbindTexture(GLuint handle) {
     for (auto& texture : textures) {
         if (texture == handle) {

src/video_core/renderer_opengl/gl_state.h

@@ -63,13 +63,6 @@ public:
         GLint height = 0;
         GLfloat depth_range_near = 0.0f; // GL_DEPTH_RANGE
         GLfloat depth_range_far = 1.0f;  // GL_DEPTH_RANGE
-        struct {
-            bool enabled = false; // GL_SCISSOR_TEST
-            GLint x = 0;
-            GLint y = 0;
-            GLsizei width = 0;
-            GLsizei height = 0;
-        } scissor;
     };
     std::array<Viewport, Tegra::Engines::Maxwell3D::Regs::NumViewports> viewports;
 
@@ -117,9 +110,6 @@ public:
     OpenGLState& ResetFramebuffer(GLuint handle);
     OpenGLState& ResetRenderbuffer(GLuint handle);
 
-    /// Viewport does not affects glClearBuffer so emulate viewport using scissor test
-    void EmulateViewportWithScissor();
-
 private:
     static OpenGLState cur_state;
 };

src/video_core/renderer_opengl/gl_texture_cache.cpp

@@ -536,6 +536,7 @@ void TextureCacheOpenGL::ImageBlit(View& src_view, View& dst_view,
     } else {
         glDisable(GL_FRAMEBUFFER_SRGB);
     }
+    glDisablei(GL_SCISSOR_TEST, 0);
 
     u32 buffers{};
 

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -568,6 +568,7 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
     glDisable(GL_ALPHA_TEST);
     glDisable(GL_DEPTH_TEST);
     glDisable(GL_POLYGON_OFFSET_FILL);
+    glDisablei(GL_SCISSOR_TEST, 0);
     glCullFace(GL_BACK);
     glFrontFace(GL_CW);
     glColorMaski(0, GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);