text_buffer_manager.h

/*
 * Copyright 2013 Jeremie Roy. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
 */
 
#ifndef VCL_BGFX_TEXT_FONT_TEXT_BUFFER_MANAGER_H
#define VCL_BGFX_TEXT_FONT_TEXT_BUFFER_MANAGER_H
 
#include "font_manager.h"
 
namespace bgfx {
 
BGFX_HANDLE(TextBufferHandle)
 
#define MAX_TEXT_BUFFER_COUNT 64
 
struct BufferType
{
    enum Enum
    {
        Static,
        Dynamic,
        Transient,
    };
};
 
enum TextStyleFlags
{
    STYLE_NORMAL = 0,
    STYLE_OVERLINE = 1,
    STYLE_UNDERLINE = 1 << 1,
    STYLE_STRIKE_THROUGH = 1 << 2,
    STYLE_BACKGROUND = 1 << 3,
};
 
struct TextRectangle
{
    float width, height;
};
 
class TextBuffer;
class TextBufferManager
{
public:
    TextBufferManager(FontManager* _fontManager);
    ~TextBufferManager();
 
    TextBufferHandle createTextBuffer(uint32_t _type, BufferType::Enum _bufferType);
    void destroyTextBuffer(TextBufferHandle _handle);
    void submitTextBuffer(TextBufferHandle _handle, bgfx::ViewId _id, int32_t _depth = 0);
 
    void setStyle(TextBufferHandle _handle, uint32_t _flags = STYLE_NORMAL);
    void setTextColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
    void setBackgroundColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
 
    void setOverlineColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
    void setUnderlineColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
    void setStrikeThroughColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
 
    void setOutlineWidth(TextBufferHandle _handle, float _outlineWidth = 3.0f);
    void setOutlineColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
 
    void setDropShadowOffset(TextBufferHandle _handle, float _u, float _v);
    void setDropShadowColor(TextBufferHandle _handle, uint32_t _rgba = 0x000000FF);
    void setDropShadowSoftener(TextBufferHandle _handle, float smoother = 1.0f);
 
    void setPenPosition(TextBufferHandle _handle, float _x, float _y);
 
    void appendText(TextBufferHandle _handle, FontHandle _fontHandle, const char* _string, const char* _end = NULL);
 
    void appendText(TextBufferHandle _handle, FontHandle _fontHandle, const wchar_t* _string, const wchar_t* _end = NULL);
 
    void appendAtlasFace(TextBufferHandle _handle, uint16_t _faceIndex);
 
    void clearTextBuffer(TextBufferHandle _handle);
 
    TextRectangle getRectangle(TextBufferHandle _handle) const;
 
private:
    struct BufferCache
    {
        uint16_t indexBufferHandleIdx;
        uint16_t vertexBufferHandleIdx;
        TextBuffer* textBuffer;
        BufferType::Enum bufferType;
        uint32_t fontType;
    };
 
    BufferCache* m_textBuffers;
    bx::HandleAllocT<MAX_TEXT_BUFFER_COUNT> m_textBufferHandles;
    FontManager* m_fontManager;
    bgfx::VertexLayout m_vertexLayout;
    bgfx::UniformHandle s_texColor;
    bgfx::UniformHandle u_dropShadowColor;
    bgfx::UniformHandle u_params;
};
 
} // namespace bgfx
 
#endif // VCL_BGFX_TEXT_FONT_TEXT_BUFFER_MANAGER_H