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gsk/gl: start on basic glyphy renderjob integration

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This doesn't work correctly yet, as there are lots of bumps along the way
to still smooth out.
This commit is contained in:
Christian Hergert
2022-03-17 16:54:46 -07:00
parent 5304edd030
commit 4d413c3a55
6 changed files with 332 additions and 3 deletions
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19
gsk/gl/gskglprograms.defs
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@@ -82,3 +82,22 @@ GSK_GL_DEFINE_PROGRAM (unblurred_outset_shadow,
GSK_GL_ADD_UNIFORM (1, UNBLURRED_OUTSET_SHADOW_SPREAD, u_spread)
GSK_GL_ADD_UNIFORM (2, UNBLURRED_OUTSET_SHADOW_OFFSET, u_offset)
GSK_GL_ADD_UNIFORM (3, UNBLURRED_OUTSET_SHADOW_OUTLINE_RECT, u_outline_rect))
GSK_GL_DEFINE_PROGRAM (glyphy,
GSK_GL_SHADER_JOINED (VERTEX,
GSK_GL_SHADER_RESOURCE ("glyphy.vs.glsl"),
NULL)
GSK_GL_SHADER_JOINED (FRAGMENT,
GSK_GL_SHADER_RESOURCE ("glyphy.atlas.glsl"),
GSK_GL_SHADER_STRING (glyphy_common_shader_source ()),
GSK_GL_SHADER_STRING ("#define GLYPHY_SDF_PSEUDO_DISTANCE 1\n"),
GSK_GL_SHADER_STRING (glyphy_sdf_shader_source ()),
GSK_GL_SHADER_RESOURCE ("glyphy.fs.glsl"),
NULL),
GSK_GL_ADD_UNIFORM (0, GLYPHY_CONTRAST, u_contrast)
GSK_GL_ADD_UNIFORM (1, GLYPHY_GAMMA_ADJUST, u_gamma_adjust)
GSK_GL_ADD_UNIFORM (2, GLYPHY_OUTLINE_THICKNESS, u_outline_thickness)
GSK_GL_ADD_UNIFORM (3, GLYPHY_OUTLINE, u_outline)
GSK_GL_ADD_UNIFORM (4, GLYPHY_BOLDNESS, u_boldness)
GSK_GL_ADD_UNIFORM (5, GLYPHY_DEBUG, u_debug)
GSK_GL_ADD_UNIFORM (6, GLYPHY_ATLAS_INFO, u_atlas_info))

186
gsk/gl/gskglrenderjob.c
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@@ -3125,12 +3125,192 @@ gsk_gl_render_job_visit_text_node_legacy (GskGLRenderJob *job,
gsk_gl_render_job_end_draw (job);
}
typedef struct
{
float x;
float y;
float g16hi;
float g16lo;
} EncodedGlyph;
static unsigned int
glyph_encode (guint atlas_x , /* 7 bits */
guint atlas_y, /* 7 bits */
guint corner_x, /* 1 bit */
guint corner_y, /* 1 bit */
guint nominal_w, /* 6 bits */
guint nominal_h) /* 6 bits */
{
guint x, y;
g_assert (0 == (atlas_x & ~0x7F));
g_assert (0 == (atlas_y & ~0x7F));
g_assert (0 == (corner_x & ~1));
g_assert (0 == (corner_y & ~1));
g_assert (0 == (nominal_w & ~0x3F));
g_assert (0 == (nominal_h & ~0x3F));
x = (((atlas_x << 6) | nominal_w) << 1) | corner_x;
y = (((atlas_y << 6) | nominal_h) << 1) | corner_y;
return (x << 16) | y;
}
static void
encoded_glyph_init (EncodedGlyph *eg,
float x,
float y,
guint corner_x,
guint corner_y,
const GskGLGlyphyValue *gi)
{
guint encoded = glyph_encode (gi->atlas_x, gi->atlas_y, corner_x, corner_y, gi->nominal_w, gi->nominal_h);
eg->x = x;
eg->y = y;
eg->g16hi = encoded >> 16;
eg->g16lo = encoded & 0xFFFF;
}
static inline void
add_encoded_glyph (GskGLDrawVertex *vertices,
const EncodedGlyph *eg,
const guint16 c[4])
{
*vertices = (GskGLDrawVertex) { .position = { eg->x, eg->y}, .uv = { eg->g16hi, eg->g16lo}, .color = { c[0], c[1], c[2], c[3] } };
}
static inline void
gsk_gl_render_job_visit_text_node_glyphy (GskGLRenderJob *job,
const GskRenderNode *node,
const GdkRGBA *color,
gboolean force_color)
const GdkRGBA *color)
{
const graphene_point_t *offset;
const PangoGlyphInfo *glyphs;
const PangoGlyphInfo *gi;
GskGLGlyphyLibrary *library;
GskGLCommandBatch *batch;
const PangoFont *font;
GskGLDrawVertex *vertices;
const guint16 *c;
GskGLGlyphyKey lookup;
guint16 cc[4];
float x;
float y;
guint last_texture = 0;
guint num_glyphs;
guint used = 0;
guint i;
int x_position = 0;
g_assert (!gsk_text_node_has_color_glyphs (node));
if (!(num_glyphs = gsk_text_node_get_num_glyphs (node)))
return;
if (RGBA_IS_CLEAR (color))
return;
font = gsk_text_node_get_font (node);
glyphs = gsk_text_node_get_glyphs (node, NULL);
library = job->driver->glyphy_library;
offset = gsk_text_node_get_offset (node);
x = offset->x + job->offset_x;
y = offset->y + job->offset_y;
rgba_to_half (color, cc);
c = cc;
gsk_gl_render_job_begin_draw (job, CHOOSE_PROGRAM (job, glyphy));
batch = gsk_gl_command_queue_get_batch (job->command_queue);
vertices = gsk_gl_command_queue_add_n_vertices (job->command_queue, num_glyphs);
lookup.font = (PangoFont *)font;
for (i = 0, gi = glyphs; i < num_glyphs; i++, gi++)
{
const GskGLGlyphyValue *glyph;
float cx = 0, cy = 0;
guint texture_id;
lookup.glyph = gi->glyph;
texture_id = gsk_gl_glyphy_library_lookup_or_add (library, &lookup, &glyph);
if G_UNLIKELY (texture_id == 0)
continue;
if G_UNLIKELY (last_texture != texture_id || batch->draw.vbo_count + GSK_GL_N_VERTICES > 0xffff)
{
if G_LIKELY (last_texture != 0)
{
guint vbo_offset = batch->draw.vbo_offset + batch->draw.vbo_count;
/* Since we have batched added our VBO vertices to avoid repeated
* calls to the buffer, we need to manually tweak the vbo offset
* of the new batch as otherwise it will point at the end of our
* vbo array.
*/
gsk_gl_render_job_split_draw (job);
batch = gsk_gl_command_queue_get_batch (job->command_queue);
batch->draw.vbo_offset = vbo_offset;
}
gsk_gl_program_set_uniform4i (job->current_program,
UNIFORM_GLYPHY_ATLAS_INFO, 0,
GSK_GL_TEXTURE_LIBRARY (library)->atlas_width,
GSK_GL_TEXTURE_LIBRARY (library)->atlas_height,
library->item_w,
library->item_h_q);
gsk_gl_program_set_uniform_texture (job->current_program,
UNIFORM_SHARED_SOURCE, 0,
GL_TEXTURE_2D,
GL_TEXTURE0,
texture_id);
gsk_gl_program_set_uniform1f (job->current_program,
UNIFORM_GLYPHY_GAMMA_ADJUST, 0,
1.0);
gsk_gl_program_set_uniform1f (job->current_program,
UNIFORM_GLYPHY_CONTRAST, 0,
1.0);
last_texture = texture_id;
}
cx = (float)(x_position + gi->geometry.x_offset) / PANGO_SCALE;
if G_UNLIKELY (gi->geometry.y_offset != 0)
cy = (float)(gi->geometry.y_offset) / PANGO_SCALE;
x_position += gi->geometry.width;
EncodedGlyph encoded[4];
#define ENCODE_CORNER(_cx, _cy) \
G_STMT_START { \
float _vx = x + cx + ((1-_cx) * glyph->extents.min_x + _cx * glyph->extents.max_x); \
float _vy = y + cy - ((1-_cy) * glyph->extents.min_y + _cy * glyph->extents.max_y); \
encoded_glyph_init (&encoded[_cx * 2 + _cy], _vx, _vy, _cx, _cy, glyph); \
} G_STMT_END
ENCODE_CORNER (0, 0);
ENCODE_CORNER (0, 1);
ENCODE_CORNER (1, 0);
ENCODE_CORNER (1, 1);
#undef ENCODE_CORNER
add_encoded_glyph (vertices++, &encoded[0], c);
add_encoded_glyph (vertices++, &encoded[1], c);
add_encoded_glyph (vertices++, &encoded[2], c);
add_encoded_glyph (vertices++, &encoded[1], c);
add_encoded_glyph (vertices++, &encoded[2], c);
add_encoded_glyph (vertices++, &encoded[3], c);
batch->draw.vbo_count += GSK_GL_N_VERTICES;
used++;
}
if (used != num_glyphs)
gsk_gl_command_queue_retract_n_vertices (job->command_queue, num_glyphs - used);
gsk_gl_render_job_end_draw (job);
}
static inline void
@@ -3140,7 +3320,7 @@ gsk_gl_render_job_visit_text_node (GskGLRenderJob *job,
gboolean force_color)
{
if (!gsk_text_node_has_color_glyphs (node))
gsk_gl_render_job_visit_text_node_glyphy (job, node, color, force_color);
gsk_gl_render_job_visit_text_node_glyphy (job, node, color);
else
gsk_gl_render_job_visit_text_node_legacy (job, node, color, force_color);
}

15
gsk/gl/resources/glyphy.atlas.glsl Normal file
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@@ -0,0 +1,15 @@
uniform ivec4 u_atlas_info;
#define GLYPHY_TEXTURE1D_EXTRA_DECLS , sampler2D _tex, ivec4 _atlas_info, ivec2 _atlas_pos
#define GLYPHY_TEXTURE1D_EXTRA_ARGS , _tex, _atlas_info, _atlas_pos
#define GLYPHY_DEMO_EXTRA_ARGS , u_source, u_atlas_info, gi.atlas_pos
vec4
glyphy_texture1D_func (int offset GLYPHY_TEXTURE1D_EXTRA_DECLS)
{
ivec2 item_geom = _atlas_info.zw;
vec2 pos = (vec2 (_atlas_pos.xy * item_geom +
ivec2 (mod (float (offset), float (item_geom.x)), offset / item_geom.x)) +
+ vec2 (.5, .5)) / vec2(_atlas_info.xy);
return GskTexture (_tex, pos);
}

88
gsk/gl/resources/glyphy.fs.glsl Normal file
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@@ -0,0 +1,88 @@
// FRAGMENT_SHADER:
// glyphy.fs.glsl
uniform float u_contrast;
uniform float u_gamma_adjust;
uniform float u_outline_thickness;
uniform bool u_outline;
uniform float u_boldness;
uniform bool u_debug;
_IN_ vec4 v_glyph;
_IN_ vec4 final_color;
#define SQRT2_2 0.70710678118654757 /* 1 / sqrt(2.) */
#define SQRT2 1.4142135623730951
struct glyph_info_t {
ivec2 nominal_size;
ivec2 atlas_pos;
};
glyph_info_t
glyph_info_decode (vec4 v)
{
glyph_info_t gi;
gi.nominal_size = (ivec2 (mod (v.zw, 256.)) + 2) / 4;
gi.atlas_pos = ivec2 (v_glyph.zw) / 256;
return gi;
}
float
antialias (float d)
{
return smoothstep (-.75, +.75, d);
}
void
main()
{
vec2 p = v_glyph.xy;
glyph_info_t gi = glyph_info_decode (v_glyph);
/* isotropic antialiasing */
vec2 dpdx = dFdx (p);
vec2 dpdy = dFdy (p);
float m = length (vec2 (length (dpdx), length (dpdy))) * SQRT2_2;
vec4 color = final_color;
float gsdist = glyphy_sdf (p, gi.nominal_size GLYPHY_DEMO_EXTRA_ARGS);
float sdist = gsdist / m * u_contrast;
if (!u_debug) {
sdist -= u_boldness * 10.;
if (u_outline)
sdist = abs (sdist) - u_outline_thickness * .5;
if (sdist > 1.)
discard;
float alpha = antialias (-sdist);
if (u_gamma_adjust != 1.)
alpha = pow (alpha, 1./u_gamma_adjust);
color = vec4 (color.rgb,color.a * alpha);
} else {
color = vec4 (0,0,0,0);
// Color the inside of the glyph a light red
color += vec4 (.5,0,0,.5) * smoothstep (1., -1., sdist);
float udist = abs (sdist);
float gudist = abs (gsdist);
// Color the outline red
color += vec4 (1,0,0,1) * smoothstep (2., 1., udist);
// Color the distance field in green
if (!glyphy_isinf (udist))
color += vec4(0,.4,0,.4 - (abs(gsdist) / max(float(gi.nominal_size.x), float(gi.nominal_size.y))) * 4.);
float pdist = glyphy_point_dist (p, gi.nominal_size GLYPHY_DEMO_EXTRA_ARGS);
// Color points green
color = mix (vec4 (0,1,0,.5), color, smoothstep (.05, .06, pdist));
glyphy_arc_list_t arc_list = glyphy_arc_list (p, gi.nominal_size GLYPHY_DEMO_EXTRA_ARGS);
// Color the number of endpoints per cell blue
color += vec4 (0,0,1,.1) * float(arc_list.num_endpoints) * 32./255.;
}
gskSetOutputColor(color);
}

24
gsk/gl/resources/glyphy.vs.glsl Normal file
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@@ -0,0 +1,24 @@
// VERTEX_SHADER:
// glyphy.vs.glsl
_OUT_ vec4 v_glyph;
_OUT_ vec4 final_color;
vec4
glyph_vertex_transcode (vec2 v)
{
ivec2 g = ivec2 (v);
ivec2 corner = ivec2 (mod (v, 2.));
g /= 2;
ivec2 nominal_size = ivec2 (mod (vec2(g), 64.));
return vec4 (corner * nominal_size, g * 4);
}
void
main()
{
v_glyph = glyph_vertex_transcode(aUv);
vUv = v_glyph.zw;
gl_Position = u_projection * u_modelview * vec4(aPosition, 0.0, 1.0);
final_color = gsk_scaled_premultiply(aColor, u_alpha);
}

3
gsk/meson.build
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@@ -19,6 +19,9 @@ gsk_private_gl_shaders = [
'gl/resources/repeat.glsl',
'gl/resources/custom.glsl',
'gl/resources/filled_border.glsl',
'gl/resources/glyphy.atlas.glsl',
'gl/resources/glyphy.fs.glsl',
'gl/resources/glyphy.vs.glsl',
]
gsk_public_sources = files([