1 files changed, 312 insertions, 0 deletions

diff --git a/src/common/framebuffer_layout.cpp b/src/common/framebuffer_layout.cpp
new file mode 100644
index 000000000..a0e75090d
--- /dev/null
+++ b/src/common/framebuffer_layout.cpp
@@ -0,0 +1,312 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <cmath>
+
+#include "common/assert.h"
+#include "common/framebuffer_layout.h"
+#include "video_core/video_core.h"
+
+namespace Layout {
+static FramebufferLayout DefaultFrameLayout(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, true, true, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenTopHeight * 2) /
+        VideoCore::kScreenTopWidth;
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.top_screen.left = 0;
+        res.top_screen.right = res.top_screen.left + width;
+        res.top_screen.top = (height - viewport_height) / 2;
+        res.top_screen.bottom = res.top_screen.top + viewport_height / 2;
+
+        int bottom_width = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomWidth) /
+            VideoCore::kScreenTopWidth) * (res.top_screen.right - res.top_screen.left));
+        int bottom_border = ((res.top_screen.right - res.top_screen.left) - bottom_width) / 2;
+
+        res.bottom_screen.left = bottom_border;
+        res.bottom_screen.right = res.bottom_screen.left + bottom_width;
+        res.bottom_screen.top = res.top_screen.bottom;
+        res.bottom_screen.bottom = res.bottom_screen.top + viewport_height / 2;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+
+        res.top_screen.left = (width - viewport_width) / 2;
+        res.top_screen.right = res.top_screen.left + viewport_width;
+        res.top_screen.top = 0;
+        res.top_screen.bottom = res.top_screen.top + height / 2;
+
+        int bottom_width = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomWidth) /
+            VideoCore::kScreenTopWidth) * (res.top_screen.right - res.top_screen.left));
+        int bottom_border = ((res.top_screen.right - res.top_screen.left) - bottom_width) / 2;
+
+        res.bottom_screen.left = res.top_screen.left + bottom_border;
+        res.bottom_screen.right = res.bottom_screen.left + bottom_width;
+        res.bottom_screen.top = res.top_screen.bottom;
+        res.bottom_screen.bottom = res.bottom_screen.top + height / 2;
+    }
+
+    return res;
+}
+
+static FramebufferLayout DefaultFrameLayout_Swapped(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, true, true, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenTopHeight * 2) /
+        VideoCore::kScreenTopWidth;
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.top_screen.left = 0;
+        res.top_screen.right = res.top_screen.left + width;
+
+        int bottom_width = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomWidth) /
+            VideoCore::kScreenTopWidth) * (res.top_screen.right - res.top_screen.left));
+        int bottom_border = ((res.top_screen.right - res.top_screen.left) - bottom_width) / 2;
+
+        res.bottom_screen.left = bottom_border;
+        res.bottom_screen.right = res.bottom_screen.left + bottom_width;
+        res.bottom_screen.top = (height - viewport_height) / 2;
+        res.bottom_screen.bottom = res.bottom_screen.top + viewport_height / 2;
+
+        res.top_screen.top = res.bottom_screen.bottom;
+        res.top_screen.bottom = res.top_screen.top + viewport_height / 2;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+        res.top_screen.left = (width - viewport_width) / 2;
+        res.top_screen.right = res.top_screen.left + viewport_width;
+
+        int bottom_width = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomWidth) /
+            VideoCore::kScreenTopWidth) * (res.top_screen.right - res.top_screen.left));
+        int bottom_border = ((res.top_screen.right - res.top_screen.left) - bottom_width) / 2;
+
+        res.bottom_screen.left = res.top_screen.left + bottom_border;
+        res.bottom_screen.right = res.bottom_screen.left + bottom_width;
+        res.bottom_screen.top = 0;
+        res.bottom_screen.bottom = res.bottom_screen.top + height / 2;
+
+        res.top_screen.top = res.bottom_screen.bottom;
+        res.top_screen.bottom = res.top_screen.top + height / 2;
+    }
+
+    return res;
+}
+
+static FramebufferLayout SingleFrameLayout(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, true, false, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenTopHeight) /
+        VideoCore::kScreenTopWidth;
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.top_screen.left = 0;
+        res.top_screen.right = res.top_screen.left + width;
+        res.top_screen.top = (height - viewport_height) / 2;
+        res.top_screen.bottom = res.top_screen.top + viewport_height;
+
+        res.bottom_screen.left = 0;
+        res.bottom_screen.right = VideoCore::kScreenBottomWidth;
+        res.bottom_screen.top = 0;
+        res.bottom_screen.bottom = VideoCore::kScreenBottomHeight;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+
+        res.top_screen.left = (width - viewport_width) / 2;
+        res.top_screen.right = res.top_screen.left + viewport_width;
+        res.top_screen.top = 0;
+        res.top_screen.bottom = res.top_screen.top + height;
+
+        // The Rasterizer still depends on these fields to maintain the right aspect ratio
+        res.bottom_screen.left = 0;
+        res.bottom_screen.right = VideoCore::kScreenBottomWidth;
+        res.bottom_screen.top = 0;
+        res.bottom_screen.bottom = VideoCore::kScreenBottomHeight;
+    }
+
+    return res;
+}
+
+static FramebufferLayout SingleFrameLayout_Swapped(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, false, true, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenBottomHeight) /
+        VideoCore::kScreenBottomWidth;
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.bottom_screen.left = 0;
+        res.bottom_screen.right = res.bottom_screen.left + width;
+        res.bottom_screen.top = (height - viewport_height) / 2;
+        res.bottom_screen.bottom = res.bottom_screen.top + viewport_height;
+
+        // The Rasterizer still depends on these fields to maintain the right aspect ratio
+        res.top_screen.left = 0;
+        res.top_screen.right = VideoCore::kScreenTopWidth;
+        res.top_screen.top = 0;
+        res.top_screen.bottom = VideoCore::kScreenTopHeight;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+
+        res.bottom_screen.left = (width - viewport_width) / 2;
+        res.bottom_screen.right = res.bottom_screen.left + viewport_width;
+        res.bottom_screen.top = 0;
+        res.bottom_screen.bottom = res.bottom_screen.top + height;
+
+        res.top_screen.left = 0;
+        res.top_screen.right = VideoCore::kScreenTopWidth;
+        res.top_screen.top = 0;
+        res.top_screen.bottom = VideoCore::kScreenTopHeight;
+    }
+
+    return res;
+}
+
+static FramebufferLayout LargeFrameLayout(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, true, true, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenTopHeight * 4) /
+        (VideoCore::kScreenTopWidth * 4 + VideoCore::kScreenBottomWidth);
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.top_screen.left = 0;
+        // Top screen occupies 4 / 5ths of the total width
+        res.top_screen.right = static_cast<int>(std::round(width / 5)) * 4;
+        res.top_screen.top = (height - viewport_height) / 2;
+        res.top_screen.bottom = res.top_screen.top + viewport_height;
+
+        int bottom_height = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomHeight) /
+            VideoCore::kScreenBottomWidth) * (width - res.top_screen.right));
+
+        res.bottom_screen.left = res.top_screen.right;
+        res.bottom_screen.right = width;
+        res.bottom_screen.bottom = res.top_screen.bottom;
+        res.bottom_screen.top = res.bottom_screen.bottom - bottom_height;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+        // Break the viewport into fifths and give top 4 of them
+        int fifth_width = static_cast<int>(std::round(viewport_width / 5));
+
+        res.top_screen.left = (width - viewport_width) / 2;
+        res.top_screen.right = res.top_screen.left + fifth_width * 4;
+        res.top_screen.top = 0;
+        res.top_screen.bottom = height;
+
+        int bottom_height = static_cast<int>((static_cast<float>(VideoCore::kScreenBottomHeight) /
+            VideoCore::kScreenBottomWidth) * (fifth_width));
+
+        res.bottom_screen.left = res.top_screen.right;
+        res.bottom_screen.right = width - (width - viewport_width) / 2;
+        res.bottom_screen.bottom = res.top_screen.bottom;
+        res.bottom_screen.top = res.bottom_screen.bottom - bottom_height;
+    }
+
+    return res;
+}
+
+static FramebufferLayout LargeFrameLayout_Swapped(unsigned width, unsigned height) {
+
+    ASSERT(width > 0);
+    ASSERT(height > 0);
+
+    FramebufferLayout res {width, height, true, true, {}, {}};
+
+    float window_aspect_ratio = static_cast<float>(height) / width;
+    float emulation_aspect_ratio = static_cast<float>(VideoCore::kScreenBottomHeight * 4) /
+        (VideoCore::kScreenBottomWidth * 4 + VideoCore::kScreenTopWidth);
+
+    if (window_aspect_ratio > emulation_aspect_ratio) {
+        // Window is narrower than the emulation content => apply borders to the top and bottom
+        int viewport_height = static_cast<int>(std::round(emulation_aspect_ratio * width));
+
+        res.bottom_screen.left = 0;
+        // Top screen occupies 4 / 5ths of the total width
+        res.bottom_screen.right = static_cast<int>(std::round(width / 5)) * 4;
+        res.bottom_screen.top = (height - viewport_height) / 2;
+        res.bottom_screen.bottom = res.bottom_screen.top + viewport_height;
+
+        int top_height = static_cast<int>((static_cast<float>(VideoCore::kScreenTopHeight) /
+            VideoCore::kScreenTopWidth) * (width - res.bottom_screen.right));
+
+        res.top_screen.left = res.bottom_screen.right;
+        res.top_screen.right = width;
+        res.top_screen.bottom = res.bottom_screen.bottom;
+        res.top_screen.top = res.top_screen.bottom - top_height;
+    } else {
+        // Otherwise, apply borders to the left and right sides of the window.
+        int viewport_width = static_cast<int>(std::round(height / emulation_aspect_ratio));
+        // Break the viewport into fifths and give top 4 of them
+        int fifth_width = static_cast<int>(std::round(viewport_width / 5));
+
+        res.bottom_screen.left = (width - viewport_width) / 2;
+        res.bottom_screen.right = res.bottom_screen.left + fifth_width * 4;
+        res.bottom_screen.top = 0;
+        res.bottom_screen.bottom = height;
+
+        int top_height = static_cast<int>((static_cast<float>(VideoCore::kScreenTopHeight) /
+            VideoCore::kScreenTopWidth) * (fifth_width));
+
+        res.top_screen.left = res.bottom_screen.right;
+        res.top_screen.right = width - (width - viewport_width) / 2;
+        res.top_screen.bottom = res.bottom_screen.bottom;
+        res.top_screen.top = res.top_screen.bottom - top_height;
+    }
+
+    return res;
+}
+
+FramebufferLayout DefaultFrameLayout(unsigned width, unsigned height, bool is_swapped) {
+    return is_swapped ? DefaultFrameLayout_Swapped(width, height) : DefaultFrameLayout(width, height);
+}
+
+FramebufferLayout SingleFrameLayout(unsigned width, unsigned height, bool is_swapped) {
+    return is_swapped ? SingleFrameLayout_Swapped(width, height) : SingleFrameLayout(width, height);
+}
+
+FramebufferLayout LargeFrameLayout(unsigned width, unsigned height, bool is_swapped) {
+    return is_swapped ? LargeFrameLayout_Swapped(width, height) : LargeFrameLayout(width, height);
+}
+}
\ No newline at end of file