gl_state: Remove ApplyDefaultState

OpenGL has defaults values we can trust. Remove these.

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -68,8 +68,6 @@ RasterizerOpenGL::RasterizerOpenGL(Core::System& system, Core::Frontend::EmuWind
                                    ScreenInfo& info)
     : texture_cache{system, *this, device}, shader_cache{*this, system, emu_window, device},
       system{system}, screen_info{info}, buffer_cache{*this, system, STREAM_BUFFER_SIZE} {
-    OpenGLState::ApplyDefaultState();
-
     shader_program_manager = std::make_unique<GLShader::ProgramManager>();
     state.draw.shader_program = 0;
     state.Apply();

src/video_core/renderer_opengl/gl_state.cpp

@@ -92,17 +92,6 @@ void OpenGLState::SetDefaultViewports() {
     depth_clamp.near_plane = false;
 }
 
-void OpenGLState::ApplyDefaultState() {
-    glEnable(GL_BLEND);
-    glDisable(GL_FRAMEBUFFER_SRGB);
-    glDisable(GL_CULL_FACE);
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_PRIMITIVE_RESTART);
-    glDisable(GL_STENCIL_TEST);
-    glDisable(GL_COLOR_LOGIC_OP);
-    glDisable(GL_SCISSOR_TEST);
-}
-
 void OpenGLState::ApplyFramebufferState() const {
     if (UpdateValue(cur_state.draw.read_framebuffer, draw.read_framebuffer)) {
         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw.read_framebuffer);

src/video_core/renderer_opengl/gl_state.h

@@ -70,7 +70,7 @@ public:
     } stencil;
 
     struct Blend {
-        bool enabled = true;               // GL_BLEND
+        bool enabled = false;              // GL_BLEND
         GLenum rgb_equation = GL_FUNC_ADD; // GL_BLEND_EQUATION_RGB
         GLenum a_equation = GL_FUNC_ADD;   // GL_BLEND_EQUATION_ALPHA
         GLenum src_rgb_func = GL_ONE;      // GL_BLEND_SRC_RGB
@@ -183,9 +183,6 @@ public:
     void ApplyPolygonOffset() const;
     void ApplyAlphaTest() const;
 
-    /// Set the initial OpenGL state
-    static void ApplyDefaultState();
-
     /// Resets any references to the given resource
     OpenGLState& UnbindTexture(GLuint handle);
     OpenGLState& ResetSampler(GLuint handle);