Improve OpenGL state handling

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -104,7 +104,7 @@ RasterizerOpenGL::RasterizerOpenGL(Core::Frontend::EmuWindow& window, ScreenInfo
     }
 
     ASSERT_MSG(has_ARB_separate_shader_objects, "has_ARB_separate_shader_objects is unsupported");
-
+    OpenGLState::ApplyDefaultState();
     // Clipping plane 0 is always enabled for PICA fixed clip plane z <= 0
     state.clip_distance[0] = true;
 
@@ -115,8 +115,6 @@ RasterizerOpenGL::RasterizerOpenGL(Core::Frontend::EmuWindow& window, ScreenInfo
     state.draw.shader_program = 0;
     state.Apply();
 
-    glEnable(GL_BLEND);
-
     glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &uniform_buffer_alignment);
 
     LOG_CRITICAL(Render_OpenGL, "Sync fixed function OpenGL state here!");

src/video_core/renderer_opengl/gl_state.cpp

@@ -89,7 +89,18 @@ OpenGLState::OpenGLState() {
     point.size = 1;
 }
 
-void OpenGLState::Apply() const {
+void OpenGLState::ApplyDefaultState() {
+    glDisable(GL_FRAMEBUFFER_SRGB);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_PRIMITIVE_RESTART);
+    glDisable(GL_STENCIL_TEST);
+    glEnable(GL_BLEND);
+    glDisable(GL_COLOR_LOGIC_OP);
+    glDisable(GL_SCISSOR_TEST);
+}
+
+void OpenGLState::ApplySRgb() const {
     // sRGB
     if (framebuffer_srgb.enabled != cur_state.framebuffer_srgb.enabled) {
         if (framebuffer_srgb.enabled) {
@@ -100,82 +111,89 @@ void OpenGLState::Apply() const {
             glDisable(GL_FRAMEBUFFER_SRGB);
         }
     }
+}
+
+void OpenGLState::ApplyCulling() const {
     // Culling
-    if (cull.enabled != cur_state.cull.enabled) {
+    const bool cull_changed = cull.enabled != cur_state.cull.enabled;
+    if (cull_changed) {
         if (cull.enabled) {
             glEnable(GL_CULL_FACE);
         } else {
             glDisable(GL_CULL_FACE);
         }
     }
-
+    if (cull.enabled) {
-    if (cull.mode != cur_state.cull.mode) {
+        if (cull_changed || cull.mode != cur_state.cull.mode) {
             glCullFace(cull.mode);
         }
 
-    if (cull.front_face != cur_state.cull.front_face) {
+        if (cull_changed || cull.front_face != cur_state.cull.front_face) {
             glFrontFace(cull.front_face);
         }
+    }
+}
 
+void OpenGLState::ApplyDepth() const {
     // Depth test
-    if (depth.test_enabled != cur_state.depth.test_enabled) {
+    const bool depth_test_changed = depth.test_enabled != cur_state.depth.test_enabled;
+    if (depth_test_changed) {
         if (depth.test_enabled) {
             glEnable(GL_DEPTH_TEST);
         } else {
             glDisable(GL_DEPTH_TEST);
         }
     }
-
+    if (depth.test_enabled &&
-    if (depth.test_func != cur_state.depth.test_func) {
+        (depth_test_changed || depth.test_func != cur_state.depth.test_func)) {
         glDepthFunc(depth.test_func);
     }
-
     // Depth mask
     if (depth.write_mask != cur_state.depth.write_mask) {
         glDepthMask(depth.write_mask);
     }
-
     // Depth range
     if (depth.depth_range_near != cur_state.depth.depth_range_near ||
         depth.depth_range_far != cur_state.depth.depth_range_far) {
         glDepthRange(depth.depth_range_near, depth.depth_range_far);
     }
+}
 
-    // Primitive restart
+void OpenGLState::ApplyPrimitiveRestart() const {
-    if (primitive_restart.enabled != cur_state.primitive_restart.enabled) {
+    const bool primitive_restart_changed =
+        primitive_restart.enabled != cur_state.primitive_restart.enabled;
+    if (primitive_restart_changed) {
         if (primitive_restart.enabled) {
             glEnable(GL_PRIMITIVE_RESTART);
         } else {
             glDisable(GL_PRIMITIVE_RESTART);
         }
     }
-    if (primitive_restart.index != cur_state.primitive_restart.index) {
+    if (primitive_restart_changed ||
+        (primitive_restart.enabled &&
+         primitive_restart.index != cur_state.primitive_restart.index)) {
         glPrimitiveRestartIndex(primitive_restart.index);
     }
+}
 
-    // Color mask
+void OpenGLState::ApplyStencilTest() const {
-    if (color_mask.red_enabled != cur_state.color_mask.red_enabled ||
+    const bool stencil_test_changed = stencil.test_enabled != cur_state.stencil.test_enabled;
-        color_mask.green_enabled != cur_state.color_mask.green_enabled ||
+    if (stencil_test_changed) {
-        color_mask.blue_enabled != cur_state.color_mask.blue_enabled ||
-        color_mask.alpha_enabled != cur_state.color_mask.alpha_enabled) {
-        glColorMask(color_mask.red_enabled, color_mask.green_enabled, color_mask.blue_enabled,
-                    color_mask.alpha_enabled);
-    }
-
-    // Stencil test
-    if (stencil.test_enabled != cur_state.stencil.test_enabled) {
         if (stencil.test_enabled) {
             glEnable(GL_STENCIL_TEST);
         } else {
             glDisable(GL_STENCIL_TEST);
         }
     }
-    auto config_stencil = [](GLenum face, const auto& config, const auto& prev_config) {
+    if (stencil.test_enabled) {
-        if (config.test_func != prev_config.test_func || config.test_ref != prev_config.test_ref ||
+        auto config_stencil = [stencil_test_changed](GLenum face, const auto& config,
+                                                     const auto& prev_config) {
+            if (stencil_test_changed || config.test_func != prev_config.test_func ||
+                config.test_ref != prev_config.test_ref ||
                 config.test_mask != prev_config.test_mask) {
                 glStencilFuncSeparate(face, config.test_func, config.test_ref, config.test_mask);
             }
-        if (config.action_depth_fail != prev_config.action_depth_fail ||
+            if (stencil_test_changed || config.action_depth_fail != prev_config.action_depth_fail ||
                 config.action_depth_pass != prev_config.action_depth_pass ||
                 config.action_stencil_fail != prev_config.action_stencil_fail) {
                 glStencilOpSeparate(face, config.action_stencil_fail, config.action_depth_fail,
@@ -187,9 +205,28 @@ void OpenGLState::Apply() const {
         };
         config_stencil(GL_FRONT, stencil.front, cur_state.stencil.front);
         config_stencil(GL_BACK, stencil.back, cur_state.stencil.back);
+    }
+}
 
-    // Blending
+void OpenGLState::ApplyScissorTest() const {
-    if (blend.enabled != cur_state.blend.enabled) {
+    const bool scissor_changed = scissor.enabled != cur_state.scissor.enabled;
+    if (scissor_changed) {
+        if (scissor.enabled) {
+            glEnable(GL_SCISSOR_TEST);
+        } else {
+            glDisable(GL_SCISSOR_TEST);
+        }
+    }
+    if (scissor_changed || scissor_changed || scissor.x != cur_state.scissor.x ||
+        scissor.y != cur_state.scissor.y || scissor.width != cur_state.scissor.width ||
+        scissor.height != cur_state.scissor.height) {
+        glScissor(scissor.x, scissor.y, scissor.width, scissor.height);
+    }
+}
+
+void OpenGLState::ApplyBlending() const {
+    const bool blend_changed = blend.enabled != cur_state.blend.enabled;
+    if (blend_changed) {
         if (blend.enabled) {
             ASSERT(!logic_op.enabled);
             glEnable(GL_BLEND);
@@ -197,15 +234,15 @@ void OpenGLState::Apply() const {
             glDisable(GL_BLEND);
         }
     }
-
+    if (blend.enabled) {
-    if (blend.color.red != cur_state.blend.color.red ||
+        if (blend_changed || blend.color.red != cur_state.blend.color.red ||
             blend.color.green != cur_state.blend.color.green ||
             blend.color.blue != cur_state.blend.color.blue ||
             blend.color.alpha != cur_state.blend.color.alpha) {
             glBlendColor(blend.color.red, blend.color.green, blend.color.blue, blend.color.alpha);
         }
 
-    if (blend.src_rgb_func != cur_state.blend.src_rgb_func ||
+        if (blend_changed || blend.src_rgb_func != cur_state.blend.src_rgb_func ||
             blend.dst_rgb_func != cur_state.blend.dst_rgb_func ||
             blend.src_a_func != cur_state.blend.src_a_func ||
             blend.dst_a_func != cur_state.blend.dst_a_func) {
@@ -213,13 +250,16 @@ void OpenGLState::Apply() const {
                                 blend.dst_a_func);
         }
 
-    if (blend.rgb_equation != cur_state.blend.rgb_equation ||
+        if (blend_changed || blend.rgb_equation != cur_state.blend.rgb_equation ||
             blend.a_equation != cur_state.blend.a_equation) {
             glBlendEquationSeparate(blend.rgb_equation, blend.a_equation);
         }
+    }
+}
 
-    // Logic Operation
+void OpenGLState::ApplyLogicOp() const {
-    if (logic_op.enabled != cur_state.logic_op.enabled) {
+    const bool logic_op_changed = logic_op.enabled != cur_state.logic_op.enabled;
+    if (logic_op_changed) {
         if (logic_op.enabled) {
             ASSERT(!blend.enabled);
             glEnable(GL_COLOR_LOGIC_OP);
@@ -228,11 +268,13 @@ void OpenGLState::Apply() const {
         }
     }
 
-    if (logic_op.operation != cur_state.logic_op.operation) {
+    if (logic_op.enabled &&
+        (logic_op_changed || logic_op.operation != cur_state.logic_op.operation)) {
         glLogicOp(logic_op.operation);
     }
+}
 
-    // Textures
+void OpenGLState::ApplyTextures() const {
     for (std::size_t i = 0; i < std::size(texture_units); ++i) {
         const auto& texture_unit = texture_units[i];
         const auto& cur_state_texture_unit = cur_state.texture_units[i];
@@ -251,9 +293,9 @@ void OpenGLState::Apply() const {
             glTexParameteriv(texture_unit.target, GL_TEXTURE_SWIZZLE_RGBA, mask.data());
         }
     }
+}
 
-    // Samplers
+void OpenGLState::ApplySamplers() const {
-    {
     bool has_delta{};
     std::size_t first{}, last{};
     std::array<GLuint, Tegra::Engines::Maxwell3D::Regs::NumTextureSamplers> samplers;
@@ -271,8 +313,9 @@ void OpenGLState::Apply() const {
         glBindSamplers(static_cast<GLuint>(first), static_cast<GLsizei>(last - first + 1),
                        samplers.data());
     }
-    }
+}
 
+void OpenGLState::Apply() const {
     // Framebuffer
     if (draw.read_framebuffer != cur_state.draw.read_framebuffer) {
         glBindFramebuffer(GL_READ_FRAMEBUFFER, draw.read_framebuffer);
@@ -305,27 +348,12 @@ void OpenGLState::Apply() const {
     if (draw.program_pipeline != cur_state.draw.program_pipeline) {
         glBindProgramPipeline(draw.program_pipeline);
     }
-
+    // Viewport
-    // Scissor test
-    if (scissor.enabled != cur_state.scissor.enabled) {
-        if (scissor.enabled) {
-            glEnable(GL_SCISSOR_TEST);
-        } else {
-            glDisable(GL_SCISSOR_TEST);
-        }
-    }
-
-    if (scissor.x != cur_state.scissor.x || scissor.y != cur_state.scissor.y ||
-        scissor.width != cur_state.scissor.width || scissor.height != cur_state.scissor.height) {
-        glScissor(scissor.x, scissor.y, scissor.width, scissor.height);
-    }
-
     if (viewport.x != cur_state.viewport.x || viewport.y != cur_state.viewport.y ||
         viewport.width != cur_state.viewport.width ||
         viewport.height != cur_state.viewport.height) {
         glViewport(viewport.x, viewport.y, viewport.width, viewport.height);
     }
-
     // Clip distance
     for (std::size_t i = 0; i < clip_distance.size(); ++i) {
         if (clip_distance[i] != cur_state.clip_distance[i]) {
@@ -336,12 +364,28 @@ void OpenGLState::Apply() const {
             }
         }
     }
-
+    // Color mask
+    if (color_mask.red_enabled != cur_state.color_mask.red_enabled ||
+        color_mask.green_enabled != cur_state.color_mask.green_enabled ||
+        color_mask.blue_enabled != cur_state.color_mask.blue_enabled ||
+        color_mask.alpha_enabled != cur_state.color_mask.alpha_enabled) {
+        glColorMask(color_mask.red_enabled, color_mask.green_enabled, color_mask.blue_enabled,
+                    color_mask.alpha_enabled);
+    }
     // Point
     if (point.size != cur_state.point.size) {
         glPointSize(point.size);
     }
-
+    ApplyScissorTest();
+    ApplyStencilTest();
+    ApplySRgb();
+    ApplyCulling();
+    ApplyDepth();
+    ApplyPrimitiveRestart();
+    ApplyBlending();
+    ApplyLogicOp();
+    ApplyTextures();
+    ApplySamplers();
     cur_state = *this;
 }
 

src/video_core/renderer_opengl/gl_state.h

@@ -173,7 +173,8 @@ public:
     }
     /// Apply this state as the current OpenGL state
     void Apply() const;
-
+    /// Set the initial OpenGL state
+    static void ApplyDefaultState();
     /// Resets any references to the given resource
     OpenGLState& UnbindTexture(GLuint handle);
     OpenGLState& ResetSampler(GLuint handle);
@@ -188,6 +189,16 @@ private:
     // Workaround for sRGB problems caused by
     // QT not supporting srgb output
     static bool s_rgb_used;
+    void ApplySRgb() const;
+    void ApplyCulling() const;
+    void ApplyDepth() const;
+    void ApplyPrimitiveRestart() const;
+    void ApplyStencilTest() const;
+    void ApplyScissorTest() const;
+    void ApplyBlending() const;
+    void ApplyLogicOp() const;
+    void ApplyTextures() const;
+    void ApplySamplers() const;
 };
 
 } // namespace OpenGL