191 lines
4.9 KiB
C
191 lines
4.9 KiB
C
/* Wellspring - An immediate mode font rendering system in C
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*
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* Copyright (c) 2022 Evan Hemsley
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*
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* This software is provided 'as-is', without any express or implied warranty.
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* In no event will the authors be held liable for any damages arising from
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* the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software in a
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* product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* Evan "cosmonaut" Hemsley <evan@moonside.games>
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*
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*/
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#ifndef WELLSPRING_H
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#define WELLSPRING_H
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#ifdef _WIN32
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#define WELLSPRINGAPI __declspec(dllexport)
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#define WELLSPRINGCALL __cdecl
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#else
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#define WELLSPRINGAPI
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#define WELLSPRINGCALL
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#endif
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#include <stdint.h>
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#ifdef USE_SDL2
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#include <SDL.h>
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#endif
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#ifdef __cplusplus
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extern "C"
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{
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#endif /* __cplusplus */
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/* Version API */
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#define WELLSPRING_MAJOR_VERSION 0
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#define WELLSPRING_MINOR_VERSION 1
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#define WELLSPRING_PATCH_VERSION 0
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#define WELLSPRING_COMPILED_VERSION ( \
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(WELLSPRING_MAJOR_VERSION * 100 * 100) + \
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(WELLSPRING_MINOR_VERSION * 100) + \
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(WELLSPRING_PATCH_VERSION) \
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)
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WELLSPRINGAPI uint32_t Wellspring_LinkedVersion(void);
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/* Type definitions */
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typedef struct Wellspring_Packer Wellspring_Packer;
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typedef struct Wellspring_TextBatch Wellspring_TextBatch;
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typedef struct Wellspring_FontRange
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{
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uint32_t fontSize;
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uint32_t firstCodepoint;
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uint32_t numChars;
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uint8_t oversampleH;
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uint8_t oversampleV;
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} Wellspring_FontRange;
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typedef struct Wellspring_Color
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{
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uint8_t r, g, b, a;
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} Wellspring_Color;
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typedef struct Wellspring_Vertex
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{
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float x, y, z;
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float u, v;
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uint8_t r, g, b, a;
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} Wellspring_Vertex;
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/* API definition */
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WELLSPRINGAPI Wellspring_Packer* Wellspring_CreatePacker(
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const uint8_t *fontBytes,
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uint32_t fontBytesLength,
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uint32_t width,
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uint32_t height,
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uint32_t strideInBytes, /* 0 means the buffer is tightly packed. */
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uint32_t padding /* A sensible value here is 1 to allow bilinear filtering. */
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);
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WELLSPRINGAPI uint32_t Wellspring_PackFontRanges(
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Wellspring_Packer *packer,
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Wellspring_FontRange *ranges,
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uint32_t numRanges
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);
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/* Returns a pointer to an array of rasterized pixels of the packed font.
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* This data must be uploaded to a texture before you render!
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* The pixel data becomes outdated if you call PackFontRanges.
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* Length is width * height.
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*/
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WELLSPRINGAPI uint8_t* Wellspring_GetPixelDataPointer(
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Wellspring_Packer *packer
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);
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/* Batches are not thread-safe, recommend one batch per thread. */
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WELLSPRINGAPI Wellspring_TextBatch* Wellspring_CreateTextBatch();
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/* Also restarts the batch */
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WELLSPRINGAPI void Wellspring_StartTextBatch(
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Wellspring_TextBatch *textBatch,
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Wellspring_Packer *packer
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);
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WELLSPRINGAPI uint8_t Wellspring_Draw(
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Wellspring_TextBatch *textBatch,
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float x,
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float y,
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float depth,
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Wellspring_Color *color,
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const uint8_t *strBytes,
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uint32_t strLengthInBytes
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);
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WELLSPRINGAPI void Wellspring_GetBufferData(
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Wellspring_TextBatch *textBatch,
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Wellspring_Vertex **pVertexBuffer,
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uint32_t *pVertexBufferLengthInBytes,
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uint32_t **pIndexBuffer,
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uint32_t *pIndexBufferLengthInBytes
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);
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WELLSPRINGAPI void Wellspring_DestroyTextBatch(Wellspring_TextBatch *textBatch);
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WELLSPRINGAPI void Wellspring_DestroyPacker(Wellspring_Packer *packer);
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/* Function defines */
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#ifdef USE_SDL2
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#define Wellspring_malloc SDL_malloc
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#define Wellspring_realloc SDL_realloc
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#define Wellspring_free SDL_free
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#define Wellspring_memcpy SDL_memcpy
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#define Wellspring_memset SDL_memset
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#define Wellspring_ifloor(x) ((int) SDL_floorf(x))
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#define Wellspring_iceil(x) ((int) SDL_ceilf(x))
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#define Wellspring_sqrt SDL_sqrt
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#define Wellspring_pow SDL_pow
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#define Wellspring_fmod SDL_fmod
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#define Wellspring_cos SDL_cos
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#define Wellspring_acos SDL_acos
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#define Wellspring_fabs SDL_fabs
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#define Wellspring_assert SDL_assert
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#define Wellspring_strlen SDL_strlen
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#define Wellspring_sort SDL_qsort
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#else
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#define Wellspring_malloc malloc
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#define Wellspring_realloc realloc
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#define Wellspring_free free
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#define Wellspring_memcpy memcpy
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#define Wellspring_ifloor(x) ((int) floor(x))
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#define Wellspring_iceil(x) ((int) ceil(x))
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#define Wellspring_sqrt sqrt
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#define Wellspring_pow pow
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#define Wellspring_fmod fmod
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#define Wellspring_cos cos
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#define Wellspring_acos acos
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#define Wellspring_fabs fabs
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#define Wellspring_assert assert
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#define Wellspring_strlen strlen
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#define Wellspring_sort qsort
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#endif
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* WELLSPRING_H */
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