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Diffstat (limited to 'Source/Graphics/text.h')
| -rw-r--r-- | Source/Graphics/text.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/Source/Graphics/text.h b/Source/Graphics/text.h new file mode 100644 index 00000000..3ab96e95 --- /dev/null +++ b/Source/Graphics/text.h @@ -0,0 +1,194 @@ +//----------------------------------------------------------------------------- +// Name: text.h +// Developer: Wolfire Games LLC +// Description: +// License: Read below +//----------------------------------------------------------------------------- +// +// +// Copyright 2022 Wolfire Games LLC +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +//----------------------------------------------------------------------------- +#pragma once + +#include <Graphics/textureref.h> +#include <Graphics/vbocontainer.h> +#include <Graphics/vboringcontainer.h> +#include <Graphics/font_renderer.h> + +#include <Math/vec3.h> +#include <Math/vec4.h> + +#include <Asset/Asset/texture.h> + +#include <vector> + +struct TextCanvasTextureImpl; +class vec2; +class Graphics; + +struct CanvasTextStyle { + enum Alignment {LEFT = 1,CENTER = 2,RIGHT = 3}; + static inline const char* GetAlignmentString( Alignment a ) + { + switch(a) + { + case LEFT: return "LEFT"; + case CENTER: return "CENTER"; + case RIGHT: return "RIGHT"; + default: return "(unknown alignment)"; + } + } + int font_face_id; + Alignment alignment; + CanvasTextStyle(): + font_face_id(-1), + alignment(LEFT) + {} +}; + +struct TextMetrics { + int advance[2]; // cursor position in points (64/pixel) + int bounds[4]; // bounding box of text in points (64/pixel) + float ascenderRatio; +}; + +// A texture on which text can be rendered +class TextCanvasTexture { +public: + void Create(int width, int height); + void ClearTextCanvas(); + void UploadTextCanvasToTexture(); + void AddText( const char *str, int length, const CanvasTextStyle& style, uint32_t char_output_limit ); + void AddTextMultiline( const char *str, int length, const CanvasTextStyle& style, uint32_t char_limit ); + void DebugDrawBillboard(const vec3 &pos, float scale, int lifespan); + void RemoveDebugDrawBillboard(); + void Reset(); + // (0,0) is the top-left corner of the text canvas + // The pen position is at the bottom-left corner of the text + void SetPenPosition(const vec2 &point); + void SetPenColor(int r, int g, int b, int a); + void SetPenRotation(float degrees); + static void GetLetterPosXY(const char* str, const CanvasTextStyle &style, int letter, int coords[2]); + int GetCursorPos(const char* str, const CanvasTextStyle& style, const int coords[2], uint32_t char_limit); + TextCanvasTexture(); + ~TextCanvasTexture(); + TextCanvasTexture(const TextCanvasTexture& other); + TextureRef GetTexture() const; + void GetTextMetricsInfo( const char *str, int length, const CanvasTextStyle& style, TextMetrics &metrics, uint32_t char_limit ); +private: + enum TextModeFlags {TMF_METRICS = 1, TMF_DRAW = 2, TMF_AUTO_NEWLINE = 4}; + void RenderText( const char *str, int length, const CanvasTextStyle& style, TextMetrics &metrics, uint32_t mode, uint32_t char_limit ); + TextCanvasTextureImpl *impl_; + + int debug_draw_billboard_id; +}; + +struct CharacterInfo { + uint32_t codepoint; + bool lowercase; + int width; + int height; + int advance_x; + int pos[2]; + int bearing[2]; +}; + +// A texture containing a list of common latin characters, including ascii +class TextAtlas { +public: + void Create(const char* path, int pixel_height, FontRenderer* font_renderer, int flags); + void Dispose(); + TextAtlas(); + ~TextAtlas(); + enum Flags { + kSmallLowercase = 1 << 0 + }; + int atlas_dims[2]; + std::vector<CharacterInfo> alphabet; + static bool Pack(unsigned char* pixels, int atlas_dims[2], + int font_face_id, int lowercase_font_face_id, + FontRenderer* font_renderer, std::vector<CharacterInfo>& alphabet); + int tex; + int pixel_height; +}; + +struct CachedTextAtlas { + static const unsigned kPathSize = 512; + char path[kPathSize]; + int pixel_height; + int flags; + TextAtlas atlas; + +}; + +struct CachedTextAtlases { + static const int kMaxAtlases = 32; + int num_atlases; + CachedTextAtlas cached[kMaxAtlases]; + CachedTextAtlases():num_atlases(0) {} +}; + +class TextAtlasRenderer { +public: + void Init(); + void Dispose(); + void AddText(TextAtlas* text_atlas, const char* text, int pos[2], FontRenderer* font_renderer, uint32_t char_output_limit); + TextMetrics GetMetrics( TextAtlas* text_atlas, const char* text, FontRenderer* font_renderer, uint32_t char_output_limit); + void Draw(TextAtlas* atlas, Graphics* graphics, char flags, const vec4& color); + enum TextFlags { + kTextShadow = 1 + }; + TextAtlasRenderer(); + + int num_characters; + static const int kFloatsPerVert = 4; + static const int kMaxCharacters = 1024; + unsigned indices[kMaxCharacters * 6]; + float verts[kMaxCharacters * 4 * kFloatsPerVert]; //2v2t + VBORingContainer vert_vbo; + VBORingContainer index_vbo; +private: + int shader_id; + int shader_attrib_vert_coord; + int shader_attrib_tex_coord; + int uniform_mvp_mat; + int uniform_color; +}; + +class ASContext; +void AttachTextCanvasTextureToASContext(ASContext* ctx); +void DisposeTextAtlases(); +void TestTextAtlas(); + +enum { + kTextAtlasMono, + kTextAtlasDynamic, + kNumTextAtlas +}; + +struct ASTextContext { + FontRenderer* font_renderer; + Graphics* graphics; + CachedTextAtlases atlases; + TextAtlasRenderer text_atlas_renderer; + bool text_atlas_renderer_setup; + ASTextContext():text_atlas_renderer_setup(false){} + + void ASDrawTextAtlas(const std::string &path, int pixel_height, int flags, const std::string &txt, int x, int y, vec4 color); + void ASDrawTextAtlas2(const std::string &path, int pixel_height, int flags, const std::string &txt, int x, int y, vec4 color, uint32_t char_limit); + TextMetrics ASGetTextAtlasMetrics(const std::string &path, int pixel_height, int flags, const std::string &txt ); + TextMetrics ASGetTextAtlasMetrics2(const std::string &path, int pixel_height, int flags, const std::string &txt, uint32_t char_limit ); +}; |