mirror of
https://github.com/Ed94/VEFontCache-Odin.git
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53 lines
1.5 KiB
GLSL
53 lines
1.5 KiB
GLSL
// module naming rules are currently dumb with shdc rn...
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// @module ve_draw_text
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@header package ve_sokol
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@header import sg "thirdparty:sokol/gfx"
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@vs draw_text_vs
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in vec2 v_position;
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in vec2 v_texture;
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out vec2 uv;
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void main()
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{
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#if SOKOL_GLSL
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uv = vec2( v_texture.x, v_texture.y );
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#else
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uv = vec2( v_texture.x, 1.0 - v_texture.y );
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#endif
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gl_Position = vec4( v_position * 2.0f - 1.0f, 0.0f, 1.0f );
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}
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@end
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@fs draw_text_fs
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in vec2 uv;
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out vec4 frag_color;
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layout(binding = 0) uniform texture2D draw_text_src_texture;
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layout(binding = 0) uniform sampler draw_text_src_sampler;
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layout(binding = 0) uniform draw_text_fs_params {
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vec2 glyph_buffer_size;
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float over_sample;
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vec4 colour;
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};
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void main()
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{
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float alpha = texture(sampler2D( draw_text_src_texture, draw_text_src_sampler ), uv ).x;
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const vec2 texture_size = glyph_buffer_size;
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const float down_sample = 1.0f / over_sample;
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alpha =
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(texture(sampler2D( draw_text_src_texture, draw_text_src_sampler), uv + vec2( -0.5f, -0.5f) * texture_size ).x * down_sample)
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+ (texture(sampler2D( draw_text_src_texture, draw_text_src_sampler), uv + vec2( -0.5f, 0.5f) * texture_size ).x * down_sample)
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+ (texture(sampler2D( draw_text_src_texture, draw_text_src_sampler), uv + vec2( 0.5f, -0.5f) * texture_size ).x * down_sample)
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+ (texture(sampler2D( draw_text_src_texture, draw_text_src_sampler), uv + vec2( 0.5f, 0.5f) * texture_size ).x * down_sample);
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frag_color = vec4( colour.xyz, colour.a * alpha );
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}
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@end
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@program draw_text draw_text_vs draw_text_fs
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