[WIP] D3D11 gpu accel

gfx/layers/d3d11/GpuRasterD3D11.c

@@ -0,0 +1,84 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define COBJMACROS
+#include "GpuRasterD3D11.h"
+
+#include <limits.h>
+
+static BOOL
+IntegerEdge(double value)
+{
+  /* Ordered comparisons reject NaNs and infinities before integer conversion. */
+  return value >= LONG_MIN && value <= LONG_MAX && value == (LONG)value;
+}
+
+BOOL
+GpuRasterD3D11ClipRect(const GpuRasterRect* rect, const D3D11_RECT* clip,
+                     LONG width, LONG height, D3D11_RECT* result)
+{
+  LONG left, top, right, bottom;
+  if (!rect || !clip || !result || width <= 0 || height <= 0 ||
+      !IntegerEdge(rect->left) || !IntegerEdge(rect->top) ||
+      !IntegerEdge(rect->right) || !IntegerEdge(rect->bottom) ||
+      rect->right < rect->left || rect->bottom < rect->top) {
+    return FALSE;
+  }
+
+  left = (LONG)rect->left;
+  top = (LONG)rect->top;
+  right = (LONG)rect->right;
+  bottom = (LONG)rect->bottom;
+  if (left < clip->left) left = clip->left;
+  if (top < clip->top) top = clip->top;
+  if (right > clip->right) right = clip->right;
+  if (bottom > clip->bottom) bottom = clip->bottom;
+  if (left < 0) left = 0;
+  if (top < 0) top = 0;
+  if (right > width) right = width;
+  if (bottom > height) bottom = height;
+
+  if (right <= left || bottom <= top) {
+    result->left = result->top = result->right = result->bottom = 0;
+  } else {
+    result->left = left;
+    result->top = top;
+    result->right = right;
+    result->bottom = bottom;
+  }
+  return TRUE;
+}
+
+BOOL
+GpuRasterD3D11FillRect(ID3D11DeviceContext1* context,
+                     ID3D11RenderTargetView* target,
+                     LONG width, LONG height,
+                     const GpuRasterRect* rect, const D3D11_RECT* clip,
+                     const float color[4])
+{
+  D3D11_RECT clipped;
+  D3D11_RENDER_TARGET_VIEW_DESC desc;
+  unsigned i;
+  if (!context || !target || !color ||
+      !GpuRasterD3D11ClipRect(rect, clip, width, height, &clipped)) {
+    return FALSE;
+  }
+  for (i = 0; i < 4; ++i) {
+    if (!(color[i] >= 0.0f && color[i] <= 1.0f)) {
+      return FALSE;
+    }
+  }
+
+  ID3D11RenderTargetView_GetDesc(target, &desc);
+  if ((desc.Format != DXGI_FORMAT_B8G8R8A8_UNORM &&
+       desc.Format != DXGI_FORMAT_R8G8B8A8_UNORM) ||
+      desc.ViewDimension != D3D11_RTV_DIMENSION_TEXTURE2D ||
+      desc.Texture2D.MipSlice != 0) {
+    return FALSE;
+  }
+  if (clipped.right != clipped.left && clipped.bottom != clipped.top) {
+    ID3D11DeviceContext1_ClearView(context, (ID3D11View*)target, color, &clipped, 1);
+  }
+  return TRUE;
+}