gl_state: Split textures and samplers into two arrays

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -991,7 +991,7 @@ TextureBufferUsage RasterizerOpenGL::SetupDrawTextures(Maxwell::ShaderStage stag
     const auto& maxwell3d = gpu.Maxwell3D();
     const auto& entries = shader->GetShaderEntries().samplers;
 
-    ASSERT_MSG(base_bindings.sampler + entries.size() <= std::size(state.texture_units),
+    ASSERT_MSG(base_bindings.sampler + entries.size() <= std::size(state.textures),
                "Exceeded the number of active textures.");
 
     TextureBufferUsage texture_buffer_usage{0};
@@ -1019,16 +1019,15 @@ TextureBufferUsage RasterizerOpenGL::SetupDrawTextures(Maxwell::ShaderStage stag
 bool RasterizerOpenGL::SetupTexture(const Shader& shader, u32 binding,
                                     const Tegra::Texture::FullTextureInfo& texture,
                                     const GLShader::SamplerEntry& entry) {
-    auto& unit{state.texture_units[binding]};
+    state.samplers[binding] = sampler_cache.GetSampler(texture.tsc);
-    unit.sampler = sampler_cache.GetSampler(texture.tsc);
 
     const auto view = texture_cache.GetTextureSurface(texture.tic, entry);
     if (!view) {
         // Can occur when texture addr is null or its memory is unmapped/invalid
-        unit.texture = 0;
+        state.textures[binding] = 0;
         return false;
     }
-    unit.texture = view->GetTexture();
+    state.textures[binding] = view->GetTexture();
 
     if (view->GetSurfaceParams().IsBuffer()) {
         return true;

src/video_core/renderer_opengl/gl_state.cpp

@@ -34,6 +34,25 @@ bool UpdateTie(T1 current_value, const T2 new_value) {
     return changed;
 }
 
+template <typename T>
+std::optional<std::pair<GLuint, GLsizei>> UpdateArray(T& current_values, const T& new_values) {
+    std::optional<std::size_t> first;
+    std::size_t last;
+    for (std::size_t i = 0; i < std::size(current_values); ++i) {
+        if (!UpdateValue(current_values[i], new_values[i])) {
+            continue;
+        }
+        if (!first) {
+            first = i;
+        }
+        last = i;
+    }
+    if (!first) {
+        return std::nullopt;
+    }
+    return std::make_pair(static_cast<GLuint>(*first), static_cast<GLsizei>(last - *first + 1));
+}
+
 void Enable(GLenum cap, bool enable) {
     if (enable) {
         glEnable(cap);
@@ -134,10 +153,6 @@ OpenGLState::OpenGLState() {
     logic_op.enabled = false;
     logic_op.operation = GL_COPY;
 
-    for (auto& texture_unit : texture_units) {
-        texture_unit.Reset();
-    }
-
     draw.read_framebuffer = 0;
     draw.draw_framebuffer = 0;
     draw.vertex_array = 0;
@@ -496,72 +511,20 @@ void OpenGLState::ApplyAlphaTest() const {
 }
 
 void OpenGLState::ApplyTextures() const {
-    bool has_delta{};
+    if (const auto update = UpdateArray(cur_state.textures, textures)) {
-    std::size_t first{};
+        glBindTextures(update->first, update->second, textures.data() + update->first);
-    std::size_t last{};
-    std::array<GLuint, Maxwell::NumTextureSamplers> textures;
-
-    for (std::size_t i = 0; i < std::size(texture_units); ++i) {
-        const auto& texture_unit = texture_units[i];
-        auto& cur_state_texture_unit = cur_state.texture_units[i];
-        textures[i] = texture_unit.texture;
-        if (cur_state_texture_unit.texture == textures[i]) {
-            continue;
-        }
-        cur_state_texture_unit.texture = textures[i];
-        if (!has_delta) {
-            first = i;
-            has_delta = true;
-        }
-        last = i;
-    }
-    if (has_delta) {
-        glBindTextures(static_cast<GLuint>(first), static_cast<GLsizei>(last - first + 1),
-                       textures.data() + first);
     }
 }
 
 void OpenGLState::ApplySamplers() const {
-    bool has_delta{};
+    if (const auto update = UpdateArray(cur_state.samplers, samplers)) {
-    std::size_t first{};
+        glBindSamplers(update->first, update->second, samplers.data() + update->first);
-    std::size_t last{};
-    std::array<GLuint, Maxwell::NumTextureSamplers> samplers;
-
-    for (std::size_t i = 0; i < std::size(samplers); ++i) {
-        samplers[i] = texture_units[i].sampler;
-        if (cur_state.texture_units[i].sampler == texture_units[i].sampler) {
-            continue;
-        }
-        cur_state.texture_units[i].sampler = texture_units[i].sampler;
-        if (!has_delta) {
-            first = i;
-            has_delta = true;
-        }
-        last = i;
-    }
-    if (has_delta) {
-        glBindSamplers(static_cast<GLuint>(first), static_cast<GLsizei>(last - first + 1),
-                       samplers.data() + first);
     }
 }
 
 void OpenGLState::ApplyImages() const {
-    bool has_delta{};
+    if (const auto update = UpdateArray(cur_state.images, images)) {
-    std::size_t first{};
+        glBindImageTextures(update->first, update->second, images.data() + update->first);
-    std::size_t last{};
-    for (std::size_t i = 0; i < std::size(images); ++i) {
-        if (!UpdateValue(cur_state.images[i], images[i])) {
-            continue;
-        }
-        if (!has_delta) {
-            first = i;
-            has_delta = true;
-        }
-        last = i;
-    }
-    if (has_delta) {
-        glBindImageTextures(static_cast<GLuint>(first), static_cast<GLsizei>(last - first + 1),
-                            images.data() + first);
     }
 }
 
@@ -627,18 +590,18 @@ void OpenGLState::EmulateViewportWithScissor() {
 }
 
 OpenGLState& OpenGLState::UnbindTexture(GLuint handle) {
-    for (auto& unit : texture_units) {
+    for (auto& texture : textures) {
-        if (unit.texture == handle) {
+        if (texture == handle) {
-            unit.Unbind();
+            texture = 0;
         }
     }
     return *this;
 }
 
 OpenGLState& OpenGLState::ResetSampler(GLuint handle) {
-    for (auto& unit : texture_units) {
+    for (auto& sampler : samplers) {
-        if (unit.sampler == handle) {
+        if (sampler == handle) {
-            unit.sampler = 0;
+            sampler = 0;
         }
     }
     return *this;

src/video_core/renderer_opengl/gl_state.h

@@ -118,22 +118,8 @@ public:
         GLenum operation;
     } logic_op;
 
-    // 3 texture units - one for each that is used in PICA fragment shader emulation
+    std::array<GLuint, Tegra::Engines::Maxwell3D::Regs::NumTextureSamplers> textures{};
-    struct TextureUnit {
+    std::array<GLuint, Tegra::Engines::Maxwell3D::Regs::NumTextureSamplers> samplers{};
-        GLuint texture; // GL_TEXTURE_BINDING_2D
-        GLuint sampler; // GL_SAMPLER_BINDING
-
-        void Unbind() {
-            texture = 0;
-        }
-
-        void Reset() {
-            Unbind();
-            sampler = 0;
-        }
-    };
-    std::array<TextureUnit, Tegra::Engines::Maxwell3D::Regs::NumTextureSamplers> texture_units;
-
     std::array<GLuint, Tegra::Engines::Maxwell3D::Regs::NumImages> images{};
 
     struct {

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -342,7 +342,7 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
         ScreenRectVertex(x + w, y + h, texcoords.bottom * scale_u, right * scale_v),
     }};
 
-    state.texture_units[0].texture = screen_info.display_texture;
+    state.textures[0] = screen_info.display_texture;
     // Workaround brigthness problems in SMO by enabling sRGB in the final output
     // if it has been used in the frame. Needed because of this bug in QT: QTBUG-50987
     state.framebuffer_srgb.enabled = OpenGLState::GetsRGBUsed();
@@ -352,7 +352,7 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
     glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
     // Restore default state
     state.framebuffer_srgb.enabled = false;
-    state.texture_units[0].texture = 0;
+    state.textures[0] = 0;
     state.AllDirty();
     state.Apply();
     // Clear sRGB state for the next frame