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Notes on using vulkan to render SDF
Raw
_notes.txt
// struct Vertex {
// pos: [f32; 3],
// uv: [f32; 2],
//}
// AngelCode .fnt format structs and classes
// http://www.angelcode.com/products/bmfont/doc/file_format.html
// struct bmchar {
// x: u32,
// y: u32,
// width: u32,
// height: u32,
// x_offset: i32,
// y_offset: i32,
// x_advance: i32,
// page: u32,
// };
// Quick and dirty : complete ASCII table
// Only chars present in the .fnt are filled with data!
// fontChars: [bmchar; 255]
// TODO: Store and apply kerning!
int32_t nextValuePair(std::stringstream *stream)
{
std::string pair;
*stream >> pair;
uint32_t spos = pair.find("=");
std::string value = pair.substr(spos + 1);
int32_t val = std::stoi(value);
return val;
}
// Basic parser for AngelCode bitmap font format files
// See http://www.angelcode.com/products/bmfont/doc/file_format.html for details
void parsebmFont()
{
std::string fileName = getAssetPath() + "font.fnt";
std::filebuf fileBuffer;
fileBuffer.open(fileName, std::ios::in);
std::istream istream(&fileBuffer);
assert(istream.good());
while (!istream.eof())
{
std::string line;
std::stringstream lineStream;
std::getline(istream, line);
lineStream << line;
std::string info;
lineStream >> info;
if (info == "char")
{
// char id
uint32_t charid = nextValuePair(&lineStream);
// Char properties
fontChars[charid].x = nextValuePair(&lineStream);
fontChars[charid].y = nextValuePair(&lineStream);
fontChars[charid].width = nextValuePair(&lineStream);
fontChars[charid].height = nextValuePair(&lineStream);
fontChars[charid].xoffset = nextValuePair(&lineStream);
fontChars[charid].yoffset = nextValuePair(&lineStream);
fontChars[charid].xadvance = nextValuePair(&lineStream);
fontChars[charid].page = nextValuePair(&lineStream);
}
}
}
// Load an sdf font from a .fnt file by parsing the angelcode .fnt format into the ascii_table
// Geometry
// Create a vertex buffer containing quads for the passed text
// Creates a vertex buffer containing quads for the passed text
fn generateText(text
: &str)
{
// vec of Vertex
let indexOffset : u32 = 0;
let w : f32 = textures.fontSDF.width;
let posx = 0.0f;
let posy = 0.0f;
// Iterate over chars
for (uint32_t i = 0; i < text.size(); i++)
{
// Lookup corresponding char in ascii_table for info
bmchar *charInfo = &fontChars[(int)text[i]];
// Default to width of 36 if width is 0
if (charInfo->width == 0)
charInfo->width = 36;
// Calculate width, height, and dimensions for quad
float charw = ((float)(charInfo->width) / 36.0f);
float dimx = 1.0f * charw;
float charh = ((float)(charInfo->height) / 36.0f);
float dimy = 1.0f * charh;
float us = charInfo->x / w;
float ue = (charInfo->x + charInfo->width) / w;
float ts = charInfo->y / w;
float te = (charInfo->y + charInfo->height) / w;
float xo = charInfo->xoffset / 36.0f;
float yo = charInfo->yoffset / 36.0f;
posy = yo;
// Push the calculated vertex into the buffer
vertices.push_back({{posx + dimx + xo, posy + dimy, 0.0f}, {ue, te}});
vertices.push_back({{posx + xo, posy + dimy, 0.0f}, {us, te}});
vertices.push_back({{posx + xo, posy, 0.0f}, {us, ts}});
vertices.push_back({{posx + dimx + xo, posy, 0.0f}, {ue, ts}});
// Push 6 indices in, incrementing by the indexOffset
std::array<uint32_t, 6> letterIndices = {0, 1, 2, 2, 3, 0};
for (auto &index : letterIndices)
{
indices.push_back(indexOffset + index);
}
// Increment the index offset
indexOffset += 4;
// Advance the x pos
float advance = ((float)(charInfo->xadvance) / 36.0f);
posx += advance;
}
indexCount = indices.size();
// Center vertices
for (auto &v : vertices)
{
v.pos[0] -= posx / 2.0f;
v.pos[1] -= 0.5f;
}
// Generate host accessible buffers for the text vertices and indices and upload the data
}
// Vertex description
// size of Vertex
// Attribute descriptions
// location 0: position
// offset 0, vk::Format::R32G32B32_SFLOAT
// location 1 : Texture coordinates
// offset (sizeof(float) * 3), vk::Format::R32G32_SFLOAT
// Descriptor pool sizes
// 4 uniform buffer
// 2 combined image sampler
//
// max set size 2
// Descriptor set layout
// binding 0: vertex shader uniform buffer
// uniform buffer, vertex stage
// binding 1: fragment shader image sampler
// combined image sampler, fragment stage
// binding 2: fragment shader uniform buffer
// uniform buffer, fragment stage
// Descriptor Set
// allocate the descriptor set
// textureDescriptor image info
// fontSdf texture sampler/view, shader read only optimal layout
// write descriptor sets
// binding 0: vertex shader uniform buffer
// descriptor type uniform buffer, uniformBufferVs
// binding 1: fragment shader texture sampler
// descriptor type combined image sampler, textureDescriptor
// binding 2: fragment shader uniform buffer
// descriptor type uniform buffer, uniformBufferFs
// update descriptor sets using the write descriptor sets
// SDF
// bind descriptor set
// bind pipeline
// bind vertex buffers
// bind index buffers
// draw indexed quads
// Uniform Buffer Vertex Shader
// struct VertexShaderUbo
// {
// projection: glm::Mat4,
// modelView: glm::Mat4,
// }
//
// Uniform Buffer Fragment Shader
// struct FragmentShaderUbo
// {
// outlineColor: glm::Vec4, // 1.0, 0.0, 0.0, 0.0
// outlineWidth: f32, // 0.6
// ouline: bool, // true
// }
// SDF Pipeline
//
// VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST (primitive topology)
// rasterization state, polygon mode fill, cull mode none, front face counter clockwise
// blending enabled, color write mask = 0xF
//
// blendAttachmentState.blendEnable = VK_TRUE;
// blendAttachmentState.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
// blendAttachmentState.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
// blendAttachmentState.colorBlendOp = VK_BLEND_OP_ADD;
// blendAttachmentState.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
// blendAttachmentState.dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
// blendAttachmentState.alphaBlendOp = VK_BLEND_OP_ADD;
// blendAttachmentState.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;
//
// depth test disabled
// depth write enabled
// depth compare op less or equal
//
// multisampling SampleCountFlags TYPE_1
// dynamic viewport and scissor
//
// sdf.vert.spv
// sdf.frag.spv
// vertex shader
//
// #version 450
// layout (location = 0) in vec3 inPos;
// layout (location = 1) in vec2 inUV;
// layout (binding = 0) uniform UBO
// {
// mat4 projection;
// mat4 model;
// } ubo;
// layout (location = 0) out vec2 outUV;
// void main()
// {
// outUV = inUV;
// gl_Position = ubo.projection * ubo.model * vec4(inPos.xyz, 1.0);
// }
// fragment shader
//
// #version 450
// layout (binding = 1) uniform sampler2D samplerColor;
// layout (binding = 2) uniform UBO
// {
// vec4 outlineColor;
// float outlineWidth;
// float outline;
// } ubo;
// layout (location = 0) in vec2 inUV;
// layout (location = 0) out vec4 outFragColor;
// void main()
// {
// float distance = texture(samplerColor, inUV).a;
// float smoothWidth = fwidth(distance);
// float alpha = smoothstep(0.5 - smoothWidth, 0.5 + smoothWidth, distance);
// vec3 rgb = vec3(alpha);
// if (ubo.outline > 0.0)
// {
// float w = 1.0 - ubo.outlineWidth;
// alpha = smoothstep(w - smoothWidth, w + smoothWidth, distance);
// rgb += mix(vec3(alpha), ubo.outlineColor.rgb, alpha);
// }
// outFragColor = vec4(rgb, alpha);
// }
Raw
font.fnt
info face="Arial Black Standard" size=32 bold=0 italic=0 charset="" unicode=0 stretchH=100 smooth=1 aa=1 padding=4,4,4,4 spacing=-8,-8
common lineHeight=46 base=36 scaleW=512 scaleH=512 pages=1 packed=0
page id=0 file="sdf.png"
chars count=97
char id=0 x=237 y=102 width=25 height=29 xoffset=-4 yoffset=11 xadvance=24 page=0 chnl=0
char id=10 x=0 y=0 width=0 height=0 xoffset=-4 yoffset=0 xadvance=0 page=0 chnl=0
char id=32 x=0 y=0 width=0 height=0 xoffset=-4 yoffset=0 xadvance=11 page=0 chnl=0
char id=33 x=27 y=102 width=15 height=32 xoffset=-4 yoffset=8 xadvance=11 page=0 chnl=0
char id=34 x=298 y=134 width=24 height=17 xoffset=-4 yoffset=8 xadvance=16 page=0 chnl=0
char id=35 x=154 y=102 width=28 height=32 xoffset=-4 yoffset=8 xadvance=21 page=0 chnl=0
char id=36 x=150 y=0 width=28 height=37 xoffset=-4 yoffset=6 xadvance=21 page=0 chnl=0
char id=37 x=117 y=102 width=37 height=32 xoffset=-4 yoffset=8 xadvance=32 page=0 chnl=0
char id=38 x=182 y=102 width=34 height=32 xoffset=-4 yoffset=8 xadvance=28 page=0 chnl=0
char id=39 x=322 y=134 width=15 height=17 xoffset=-4 yoffset=8 xadvance=9 page=0 chnl=0
char id=40 x=20 y=0 width=18 height=38 xoffset=-4 yoffset=8 xadvance=12 page=0 chnl=0
char id=41 x=38 y=0 width=19 height=38 xoffset=-4 yoffset=8 xadvance=12 page=0 chnl=0
char id=42 x=279 y=134 width=19 height=21 xoffset=-4 yoffset=8 xadvance=18 page=0 chnl=0
char id=43 x=186 y=134 width=26 height=26 xoffset=-4 yoffset=11 xadvance=21 page=0 chnl=0
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char id=49 x=261 y=70 width=22 height=32 xoffset=-4 yoffset=8 xadvance=21 page=0 chnl=0
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char id=52 x=337 y=70 width=29 height=32 xoffset=-4 yoffset=8 xadvance=21 page=0 chnl=0
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Raw
font_sdf_texture.txt
https://i.imgur.com/ltrnufN.png
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