Initial commit

engine/gfx/src/Core/Texture.cpp

@@ -0,0 +1,172 @@
+#include "Core/Texture.hpp"
+
+#include "Profiler.hpp"
+
+FASTFLAGVARIABLE(GraphicsTextureCommitChanges, false)
+
+namespace Aya
+{
+namespace Graphics
+{
+
+struct FormatDescription
+{
+    unsigned char bpp;
+    bool compressed;
+    bool depth;
+};
+
+static const FormatDescription gTextureFormats[Texture::Format_Count] = {
+    {8, false, false},
+    {16, false, false},
+    {16, false, false},
+    {32, false, false},
+    {32, false, false},
+    {64, false, false},
+    {4, true, false},
+    {8, true, false},
+    {8, true, false},
+    {2, true, false},
+    {2, true, false},
+    {4, true, false},
+    {4, true, false},
+    {4, true, false},
+    {16, false, true},
+    {32, false, true},
+};
+
+TextureRegion::TextureRegion()
+    : x(0)
+    , y(0)
+    , z(0)
+    , width(0)
+    , height(0)
+    , depth(0)
+{
+}
+
+TextureRegion::TextureRegion(unsigned int x, unsigned int y, unsigned int z, unsigned int width, unsigned int height, unsigned int depth)
+    : x(x)
+    , y(y)
+    , z(z)
+    , width(width)
+    , height(height)
+    , depth(depth)
+{
+}
+
+TextureRegion::TextureRegion(unsigned int x, unsigned int y, unsigned int width, unsigned int height)
+    : x(x)
+    , y(y)
+    , z(0)
+    , width(width)
+    , height(height)
+    , depth(1)
+{
+}
+
+Texture::Texture(
+    Device* device, Type type, Format format, unsigned int width, unsigned int height, unsigned int depth, unsigned int mipLevels, Usage usage)
+    : Resource(device)
+    , type(type)
+    , format(format)
+    , width(width)
+    , height(height)
+    , depth(depth)
+    , mipLevels(mipLevels)
+    , usage(usage)
+{
+    AYAASSERT(width > 0 && height > 0 && depth > 0);
+    AYAASSERT(mipLevels > 0 && mipLevels <= getMaxMipCount(width, height, depth));
+    AYAASSERT(type == Type_3D || depth == 1);
+
+    if (usage != Usage_Renderbuffer)
+    {
+        AYAPROFILER_COUNTER_ADD("memory/gpu/texture", getTextureSize(type, format, width, height, depth, mipLevels));
+    }
+}
+
+Texture::~Texture()
+{
+    if (usage != Usage_Renderbuffer)
+    {
+        AYAPROFILER_COUNTER_SUB("memory/gpu/texture", getTextureSize(type, format, width, height, depth, mipLevels));
+    }
+}
+
+bool Texture::isFormatCompressed(Format format)
+{
+    return gTextureFormats[format].compressed;
+}
+
+bool Texture::isFormatDepth(Format format)
+{
+    return gTextureFormats[format].depth;
+}
+
+unsigned int Texture::getFormatBits(Format format)
+{
+    return gTextureFormats[format].bpp;
+}
+
+unsigned int Texture::getImageSize(Format format, unsigned int width, unsigned int height)
+{
+    const FormatDescription& desc = gTextureFormats[format];
+
+    switch (format)
+    {
+    case Format_BC1:
+    case Format_BC2:
+    case Format_BC3:
+    case Format_ETC1:
+        return ((width + 3) / 4) * ((height + 3) / 4) * (desc.bpp * 16 / 8);
+
+    case Format_PVRTC_RGB2:
+    case Format_PVRTC_RGBA2:
+        return (std::max(width, 16u) * std::max(height, 8u) * 2 + 7) / 8;
+
+    case Format_PVRTC_RGB4:
+    case Format_PVRTC_RGBA4:
+        return (std::max(width, 8u) * std::max(height, 8u) * 4 + 7) / 8;
+
+    default:
+        AYAASSERT(!desc.compressed);
+        return width * height * (desc.bpp / 8);
+    }
+}
+
+unsigned int Texture::getTextureSize(Type type, Format format, unsigned int width, unsigned int height, unsigned int depth, unsigned int mipLevels)
+{
+    unsigned int result = 0;
+
+    for (unsigned int mip = 0; mip < mipLevels; ++mip)
+        result += Texture::getImageSize(format, Texture::getMipSide(width, mip), Texture::getMipSide(height, mip)) * Texture::getMipSide(depth, mip);
+
+    return result * (type == Texture::Type_Cube ? 6 : 1);
+}
+
+unsigned int Texture::getMipSide(unsigned int value, unsigned int mip)
+{
+    unsigned int result = value >> mip;
+
+    return result ? result : 1;
+}
+
+unsigned int Texture::getMaxMipCount(unsigned int width, unsigned int height, unsigned int depth)
+{
+    unsigned int result = 0;
+
+    while (width || height || depth)
+    {
+        result++;
+
+        width /= 2;
+        height /= 2;
+        depth /= 2;
+    }
+
+    return result;
+}
+
+} // namespace Graphics
+} // namespace Aya