sokol_fontstash.h: add documentation

1 files changed, 358 insertions, 274 deletions

diff --git a/util/sokol_fontstash.h b/util/sokol_fontstash.h
index cb41dbdf..b233fbe5 100644
--- a/util/sokol_fontstash.h
+++ b/util/sokol_fontstash.h
@@ -1,6 +1,7 @@
 #pragma once
 /*
     sokol_fontstash.h -- renderer for https://github.com/memononen/fontstash
+                         on top of sokol_gl.h
 
     Project URL: https://github.com/floooh/sokol
 
@@ -40,7 +41,90 @@
 
         sokol_gl.h
 
-    FIXME: documentation
+    HOW TO
+    ======
+    --- First initialize sokol-gfx and sokol-gl as usual:
+
+            sg_setup(&(sg_desc){...});
+            sgl_setup(&(sgl_desc){...});
+
+    --- Create at least one fontstash context with sfons_create() (this replaces
+        glfonsCreate() from fontstash.h's example GL renderer:
+
+            FONScontext* ctx = sfons_create(atlas_width, atlas_height, FONS_ZERO_TOPLEFT);
+
+        Each FONScontext manages one font atlas texture which can hold rasterized
+        glyphs for multiple fonts.
+
+    --- From here on, use fontstash.h's functions "as usual" to add TTF
+        font data and draw text. Note that (just like with sokol-gl), text
+        rendering can happen anywhere in the frame, not only inside
+        a sokol-gfx rendering pass.
+
+    --- You can use the helper function
+
+            uint32_t sfons_rgba(uint8_t r, uint8_t g, uint8_t b, uint8_t a)
+
+        To convert a 0..255 RGBA color into a packed uint32_t color value
+        expected by fontstash.h.
+
+    --- Once per frame before calling sgl_draw(), call:
+
+            sfons_flush(FONScontext* ctx)
+
+        ...this will update the dynamic sokol-gfx texture with the latest font
+        atlas content.
+
+    --- To actually render the text (and any other sokol-gl draw commands),
+        call sgl_draw() inside a sokol-gfx frame.
+
+    --- NOTE that you can mix fontstash.h calls with sokol-gl calls to mix
+        text rendering with sokol-gl rendering. You can also use
+        sokol-gl's matrix stack to position fontstash.h text in 3D.
+
+    --- finally on application shutdown, call:
+
+            sfons_shutdown()
+
+        before sgl_shutdown() and sg_shutdown()
+
+
+    WHAT HAPPENS UNDER THE HOOD:
+    ============================
+
+    sfons_create():
+        - creates a sokol-gfx shader compatible with sokol-gl
+        - creates an sgl_pipeline object with alpha-blending using
+          this shader
+        - creates a 1-byte-per-pixel font atlas texture via sokol-gfx
+          (pixel format SG_PIXELFORMAT_R8)
+
+    fonsDrawText():
+        - this will call the following sequence of sokol-gl functions:
+
+            sgl_enable_texture();
+            sgl_texture(...);
+            sgl_push_pipeline();
+            sgl_load_pipeline(...);
+            sgl_begin_triangles();
+            for each vertex:
+                sg_v2f_t2f_c1i(...);
+            sgl_end();
+            sgl_pop_pipeline();
+            sgl_disable_texture();
+
+        - note that sokol-gl will merge several sgl_*_begin/sgl_end pairs
+          into a single draw call if no relevant state has changed, typically
+          all calls to fonsDrawText() will be merged into a single draw call
+          as long as all calls use the same FONScontext
+
+    sfons_flush():
+        - this will call sg_update_image() on the font atlas texture
+          if fontstash.h has added any rasterized glyphs since the last
+          frame
+
+    sfons_shutdown():
+        - destroy the font atlas texture, sgl_pipeline and sg_shader objects
 
     LICENSE
     =======
@@ -259,282 +343,282 @@ static const char* _sfons_fs_src =
         }
 */
 static const uint8_t _sfons_vs_bin[] = {
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+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
       0,   0,   0,   0
 };
 static uint8_t _sfons_fs_bin[] = {
-     68,  88,  66,  67, 180,  53, 
-    115, 174, 239,  17, 254, 112, 
-     63, 104, 217, 123, 150, 145, 
-    179,  27,   1,   0,   0,   0, 
-    120,   2,   0,   0,   5,   0, 
-      0,   0,  52,   0,   0,   0, 
-    200,   0,   0,   0,  24,   1, 
-      0,   0,  76,   1,   0,   0, 
-    252,   1,   0,   0,  82,  68, 
-     69,  70, 140,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   2,   0,   0,   0, 
-     28,   0,   0,   0,   0,   4, 
-    255, 255,   0,  17,   0,   0, 
-    100,   0,   0,   0,  92,   0, 
-      0,   0,   3,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   1,   0, 
-      0,   0,   1,   0,   0,   0, 
-     96,   0,   0,   0,   2,   0, 
-      0,   0,   5,   0,   0,   0, 
-      4,   0,   0,   0, 255, 255, 
-    255, 255,   0,   0,   0,   0, 
-      1,   0,   0,   0,  13,   0, 
-      0,   0, 115, 109, 112,   0, 
-    116, 101, 120,   0,  77, 105, 
-     99, 114, 111, 115, 111, 102, 
-    116,  32,  40,  82,  41,  32, 
-     72,  76,  83,  76,  32,  83, 
-    104,  97, 100, 101, 114,  32, 
-     67, 111, 109, 112, 105, 108, 
-    101, 114,  32,  49,  48,  46, 
-     49,   0,  73,  83,  71,  78, 
-     72,   0,   0,   0,   2,   0, 
-      0,   0,   8,   0,   0,   0, 
-     56,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      3,   0,   0,   0,   0,   0, 
-      0,   0,  15,   3,   0,   0, 
-     65,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      3,   0,   0,   0,   1,   0, 
-      0,   0,  15,  15,   0,   0, 
-     84,  69,  88,  67,  79,  79, 
-     82,  68,   0,  67,  79,  76, 
-     79,  82,   0, 171,  79,  83, 
-     71,  78,  44,   0,   0,   0, 
-      1,   0,   0,   0,   8,   0, 
-      0,   0,  32,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   3,   0,   0,   0, 
-      0,   0,   0,   0,  15,   0, 
-      0,   0,  83,  86,  95,  84, 
-     97, 114, 103, 101, 116,   0, 
-    171, 171,  83,  72,  68,  82, 
-    168,   0,   0,   0,  64,   0, 
-      0,   0,  42,   0,   0,   0, 
-     90,   0,   0,   3,   0,  96, 
-     16,   0,   0,   0,   0,   0, 
-     88,  24,   0,   4,   0, 112, 
-     16,   0,   0,   0,   0,   0, 
-     85,  85,   0,   0,  98,  16, 
-      0,   3,  50,  16,  16,   0, 
-      0,   0,   0,   0,  98,  16, 
-      0,   3, 242,  16,  16,   0, 
-      1,   0,   0,   0, 101,   0, 
-      0,   3, 242,  32,  16,   0, 
-      0,   0,   0,   0, 104,   0, 
-      0,   2,   1,   0,   0,   0, 
-     69,   0,   0,   9, 242,   0, 
-     16,   0,   0,   0,   0,   0, 
-     70,  16,  16,   0,   0,   0, 
-      0,   0, 150, 115,  16,   0, 
-      0,   0,   0,   0,   0,  96, 
-     16,   0,   0,   0,   0,   0, 
-     54,   0,   0,   5,  18,   0, 
-     16,   0,   0,   0,   0,   0, 
-      1,  64,   0,   0,   0,   0, 
-    128,  63,  56,   0,   0,   7, 
-    242,  32,  16,   0,   0,   0, 
-      0,   0,   6,  12,  16,   0, 
-      0,   0,   0,   0,  70,  30, 
-     16,   0,   1,   0,   0,   0, 
-     62,   0,   0,   1,  83,  84, 
-     65,  84, 116,   0,   0,   0, 
-      4,   0,   0,   0,   1,   0, 
-      0,   0,   0,   0,   0,   0, 
-      3,   0,   0,   0,   1,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   1,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   1,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   1,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
-      0,   0,   0,   0,   0,   0, 
+     68,  88,  66,  67, 180,  53,
+    115, 174, 239,  17, 254, 112,
+     63, 104, 217, 123, 150, 145,
+    179,  27,   1,   0,   0,   0,
+    120,   2,   0,   0,   5,   0,
+      0,   0,  52,   0,   0,   0,
+    200,   0,   0,   0,  24,   1,
+      0,   0,  76,   1,   0,   0,
+    252,   1,   0,   0,  82,  68,
+     69,  70, 140,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   2,   0,   0,   0,
+     28,   0,   0,   0,   0,   4,
+    255, 255,   0,  17,   0,   0,
+    100,   0,   0,   0,  92,   0,
+      0,   0,   3,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   1,   0,
+      0,   0,   1,   0,   0,   0,
+     96,   0,   0,   0,   2,   0,
+      0,   0,   5,   0,   0,   0,
+      4,   0,   0,   0, 255, 255,
+    255, 255,   0,   0,   0,   0,
+      1,   0,   0,   0,  13,   0,
+      0,   0, 115, 109, 112,   0,
+    116, 101, 120,   0,  77, 105,
+     99, 114, 111, 115, 111, 102,
+    116,  32,  40,  82,  41,  32,
+     72,  76,  83,  76,  32,  83,
+    104,  97, 100, 101, 114,  32,
+     67, 111, 109, 112, 105, 108,
+    101, 114,  32,  49,  48,  46,
+     49,   0,  73,  83,  71,  78,
+     72,   0,   0,   0,   2,   0,
+      0,   0,   8,   0,   0,   0,
+     56,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      3,   0,   0,   0,   0,   0,
+      0,   0,  15,   3,   0,   0,
+     65,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      3,   0,   0,   0,   1,   0,
+      0,   0,  15,  15,   0,   0,
+     84,  69,  88,  67,  79,  79,
+     82,  68,   0,  67,  79,  76,
+     79,  82,   0, 171,  79,  83,
+     71,  78,  44,   0,   0,   0,
+      1,   0,   0,   0,   8,   0,
+      0,   0,  32,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   3,   0,   0,   0,
+      0,   0,   0,   0,  15,   0,
+      0,   0,  83,  86,  95,  84,
+     97, 114, 103, 101, 116,   0,
+    171, 171,  83,  72,  68,  82,
+    168,   0,   0,   0,  64,   0,
+      0,   0,  42,   0,   0,   0,
+     90,   0,   0,   3,   0,  96,
+     16,   0,   0,   0,   0,   0,
+     88,  24,   0,   4,   0, 112,
+     16,   0,   0,   0,   0,   0,
+     85,  85,   0,   0,  98,  16,
+      0,   3,  50,  16,  16,   0,
+      0,   0,   0,   0,  98,  16,
+      0,   3, 242,  16,  16,   0,
+      1,   0,   0,   0, 101,   0,
+      0,   3, 242,  32,  16,   0,
+      0,   0,   0,   0, 104,   0,
+      0,   2,   1,   0,   0,   0,
+     69,   0,   0,   9, 242,   0,
+     16,   0,   0,   0,   0,   0,
+     70,  16,  16,   0,   0,   0,
+      0,   0, 150, 115,  16,   0,
+      0,   0,   0,   0,   0,  96,
+     16,   0,   0,   0,   0,   0,
+     54,   0,   0,   5,  18,   0,
+     16,   0,   0,   0,   0,   0,
+      1,  64,   0,   0,   0,   0,
+    128,  63,  56,   0,   0,   7,
+    242,  32,  16,   0,   0,   0,
+      0,   0,   6,  12,  16,   0,
+      0,   0,   0,   0,  70,  30,
+     16,   0,   1,   0,   0,   0,
+     62,   0,   0,   1,  83,  84,
+     65,  84, 116,   0,   0,   0,
+      4,   0,   0,   0,   1,   0,
+      0,   0,   0,   0,   0,   0,
+      3,   0,   0,   0,   1,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   1,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   1,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   1,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
+      0,   0,   0,   0,   0,   0,
       0,   0
 };
 #elif defined(SOKOL_DUMMY_BACKEND)