219 lines
7.4 KiB
C
219 lines
7.4 KiB
C
//*****************************************************************
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//
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// $file: graphics.h $
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// $author: Martin Fouilleul $
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// $date: 23/36/2015 $
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// $revision: $
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//
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//*****************************************************************
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#ifndef __GRAPHICS_H_
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#define __GRAPHICS_H_
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#include"typedefs.h"
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#include"strings.h"
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typedef struct g_mat2x3
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{
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f32 m[6];
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} g_mat2x3;
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typedef struct g_color
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{
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union
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{
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struct
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{
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f32 r;
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f32 g;
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f32 b;
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f32 a;
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};
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f32 c[4];
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};
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} g_color;
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typedef enum {G_JOINT_MITER = 0,
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G_JOINT_BEVEL,
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G_JOINT_NONE } g_joint_type;
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typedef enum {G_CAP_NONE = 0,
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G_CAP_SQUARE } g_cap_type;
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typedef struct g_font { u64 h; } g_font;
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typedef struct g_font_extents
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{
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f32 ascent; // the extent above the baseline (by convention a positive value extends above the baseline)
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f32 descent; // the extent below the baseline (by convention, positive value extends below the baseline)
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f32 leading; // spacing between one row's descent and the next row's ascent
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f32 xHeight; // height of the lower case letter 'x'
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f32 capHeight; // height of the upper case letter 'M'
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f32 width; // maximum width of the font
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} g_font_extents;
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typedef struct g_text_extents
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{
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f32 xBearing;
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f32 yBearing;
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f32 width;
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f32 height;
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f32 xAdvance;
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f32 yAdvance;
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} g_text_extents;
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//------------------------------------------------------------------------------------------
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//NOTE(martin): fonts
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//------------------------------------------------------------------------------------------
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g_font g_font_nil();
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g_font g_font_create_default();
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//g_font g_font_create_from_memory(u32 size, byte* buffer, u32 rangeCount, unicode_range* ranges);
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void g_font_destroy(g_font font);
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//NOTE(martin): the following int valued functions return -1 if font is invalid or codepoint is not present in font//
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//TODO(martin): add enum error codes
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/*
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g_font_extents g_font_get_extents(g_font font);
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g_font_extents g_font_get_scaled_extents(g_font font, f32 emSize);
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f32 g_font_get_scale_for_em_pixels(g_font font, f32 emSize);
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//NOTE(martin): if you need to process more than one codepoint, first convert your codepoints to glyph indices, then use the
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// glyph index versions of the functions, which can take an array of glyph indices.
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str32 g_font_get_glyph_indices(g_font font, str32 codePoints, str32 backing);
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str32 g_font_push_glyph_indices(g_font font, mem_arena* arena, str32 codePoints);
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u32 g_font_get_glyph_index(g_font font, utf32 codePoint);
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int g_font_get_codepoint_extents(g_font font, utf32 codePoint, g_text_extents* outExtents);
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int g_font_get_glyph_extents(g_font font, str32 glyphIndices, g_text_extents* outExtents);
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mp_rect g_text_bounding_box_utf32(g_font font, f32 fontSize, str32 text);
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mp_rect g_text_bounding_box(g_font font, f32 fontSize, str8 text);
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*/
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//------------------------------------------------------------------------------------------
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//NOTE(martin): images
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//------------------------------------------------------------------------------------------
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/*
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g_image g_image_nil();
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bool g_image_is_nil(g_image a);
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g_image g_image_create(u32 width, u32 height);
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g_image g_image_create_from_rgba8(u32 width, u32 height, u8* pixels);
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g_image g_image_create_from_data(str8 data, bool flip);
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g_image g_image_create_from_file(str8 path, bool flip);
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void g_image_destroy(g_image image);
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void g_image_upload_region_rgba8(g_image image, mp_rect region, u8* pixels);
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vec2 g_image_size(g_image image);
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*/
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//------------------------------------------------------------------------------------------
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//NOTE(martin): atlasing
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//------------------------------------------------------------------------------------------
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/*
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//NOTE: rectangle allocator
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typedef struct g_rect_atlas g_rect_atlas;
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g_rect_atlas* g_rect_atlas_create(mem_arena* arena, i32 width, i32 height);
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mp_rect g_rect_atlas_alloc(g_rect_atlas* atlas, i32 width, i32 height);
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void g_rect_atlas_recycle(g_rect_atlas* atlas, mp_rect rect);
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//NOTE: image atlas helpers
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typedef struct g_image_region
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{
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g_image image;
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mp_rect rect;
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} g_image_region;
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g_image_region g_image_atlas_alloc_from_rgba8(g_rect_atlas* atlas, g_image backingImage, u32 width, u32 height, u8* pixels);
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g_image_region g_image_atlas_alloc_from_data(g_rect_atlas* atlas, g_image backingImage, str8 data, bool flip);
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g_image_region g_image_atlas_alloc_from_file(g_rect_atlas* atlas, g_image backingImage, str8 path, bool flip);
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void g_image_atlas_recycle(g_rect_atlas* atlas, g_image_region imageRgn);
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*/
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//------------------------------------------------------------------------------------------
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//NOTE(martin): transform, viewport and clipping
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//------------------------------------------------------------------------------------------
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void g_viewport(mp_rect viewPort);
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void g_matrix_push(g_mat2x3 matrix);
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void g_matrix_pop();
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void g_clip_push(f32 x, f32 y, f32 w, f32 h);
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void g_clip_pop();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): graphics attributes setting/getting
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//------------------------------------------------------------------------------------------
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void g_set_color(g_color color);
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void g_set_color_rgba(f32 r, f32 g, f32 b, f32 a);
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void g_set_width(f32 width);
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void g_set_tolerance(f32 tolerance);
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void g_set_joint(g_joint_type joint);
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void g_set_max_joint_excursion(f32 maxJointExcursion);
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void g_set_cap(g_cap_type cap);
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void g_set_font(g_font font);
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void g_set_font_size(f32 size);
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void g_set_text_flip(bool flip);
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/*
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void g_set_image(g_image image);
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void g_set_image_source_region(mp_rect region);
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*/
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g_color g_get_color();
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f32 g_get_width();
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f32 g_get_tolerance();
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g_joint_type g_get_joint();
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f32 g_get_max_joint_excursion();
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g_cap_type g_get_cap();
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g_font g_get_font();
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f32 g_get_font_size();
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bool g_get_text_flip();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): path construction
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//------------------------------------------------------------------------------------------
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vec2 g_get_position();
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void g_move_to(f32 x, f32 y);
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void g_line_to(f32 x, f32 y);
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void g_quadratic_to(f32 x1, f32 y1, f32 x2, f32 y2);
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void g_cubic_to(f32 x1, f32 y1, f32 x2, f32 y2, f32 x3, f32 y3);
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void g_close_path();
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/*
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mp_rect g_glyph_outlines(str32 glyphIndices);
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void g_codepoints_outlines(str32 string);
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*/
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void g_text_outlines(str8 string);
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//------------------------------------------------------------------------------------------
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//NOTE(martin): clear/fill/stroke
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//------------------------------------------------------------------------------------------
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void g_clear();
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void g_fill();
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void g_stroke();
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//------------------------------------------------------------------------------------------
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//NOTE(martin): simple shapes helpers
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//------------------------------------------------------------------------------------------
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void g_rectangle_fill(f32 x, f32 y, f32 w, f32 h);
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void g_rectangle_stroke(f32 x, f32 y, f32 w, f32 h);
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void g_rounded_rectangle_fill(f32 x, f32 y, f32 w, f32 h, f32 r);
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void g_rounded_rectangle_stroke(f32 x, f32 y, f32 w, f32 h, f32 r);
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void g_ellipse_fill(f32 x, f32 y, f32 rx, f32 ry);
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void g_ellipse_stroke(f32 x, f32 y, f32 rx, f32 ry);
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void g_circle_fill(f32 x, f32 y, f32 r);
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void g_circle_stroke(f32 x, f32 y, f32 r);
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void g_arc(f32 x, f32 y, f32 r, f32 arcAngle, f32 startAngle);
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//NOTE: image helpers
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/*
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void g_image_draw(g_image image, mp_rect rect);
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void g_image_draw_region(g_image image, mp_rect srcRegion, mp_rect dstRegion);
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*/
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#endif //__GRAPHICS_H_
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