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wg_engine: support gradient focal point

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Implemented gradien focal points
Issue https://github.com/thorvg/thorvg/issues/2728
Issue https://github.com/thorvg/thorvg/issues/2936
This commit is contained in:
Sergii Liebodkin 2024-11-06 22:09:54 +00:00 • committed by Hermet Park
parent 95d99ee74b
commit 627f358f49
3 changed files with 30 additions and 12 deletions
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38
src/renderer/wg_engine/tvgWgShaderSrc.cpp
View file

@ -111,6 +111,7 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4f {
const char* cShaderSrc_Linear = R"(
struct VertexInput { @location(0) position: vec2f };
struct VertexOutput { @builtin(position) position : vec4f, @location(0) vGradCoord : vec4f };
struct GradSettings { settings: vec4f, focal: vec4f };
// uniforms
@group(0) @binding(0) var<uniform> uViewMat : mat4x4f;
@ -118,7 +119,7 @@ struct VertexOutput { @builtin(position) position : vec4f, @location(0) vGradCoo
@group(1) @binding(1) var<uniform> uBlendSettings : vec4f;
@group(2) @binding(0) var uSamplerGrad : sampler;
@group(2) @binding(1) var uTextureGrad : texture_2d<f32>;
@group(2) @binding(2) var<uniform> uSettingGrad : vec4f;
@group(2) @binding(2) var<uniform> uSettingGrad : GradSettings;
@group(2) @binding(3) var<uniform> uTransformGrad : mat4x4f;
@vertex
@ -132,8 +133,8 @@ fn vs_main(in: VertexInput) -> VertexOutput {
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4f {
let pos = in.vGradCoord.xy;
let st = uSettingGrad.xy;
let ed = uSettingGrad.zw;
let st = uSettingGrad.settings.xy;
let ed = uSettingGrad.settings.zw;
let ba = ed - st;
let t = dot(pos - st, ba) / dot(ba, ba);
let Sc = textureSample(uTextureGrad, uSamplerGrad, vec2f(t, 0.5));
@ -149,13 +150,14 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4f {
const char* cShaderSrc_Radial = R"(
struct VertexInput { @location(0) position: vec2f };
struct VertexOutput { @builtin(position) position : vec4f, @location(0) vGradCoord : vec4f };
struct GradSettings { settings: vec4f, focal: vec4f };
@group(0) @binding(0) var<uniform> uViewMat : mat4x4f;
@group(1) @binding(0) var<uniform> uModelMat : mat4x4f;
@group(1) @binding(1) var<uniform> uBlendSettings : vec4f;
@group(2) @binding(0) var uSamplerGrad : sampler;
@group(2) @binding(1) var uTextureGrad : texture_2d<f32>;
@group(2) @binding(2) var<uniform> uSettingGrad : vec4f;
@group(2) @binding(2) var<uniform> uSettingGrad : GradSettings;
@group(2) @binding(3) var<uniform> uTransformGrad : mat4x4f;
@vertex
@ -168,8 +170,16 @@ fn vs_main(in: VertexInput) -> VertexOutput {
@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4f {
let t: f32 = distance(uSettingGrad.zw, in.vGradCoord.xy) / uSettingGrad.r;
let Sc = textureSample(uTextureGrad, uSamplerGrad, vec2f(t, 0.5));
// orignal data
let d0 = in.vGradCoord.xy - uSettingGrad.settings.xy;
let d1 = uSettingGrad.settings.xy - uSettingGrad.focal.xy;
let r0 = uSettingGrad.settings.z;
let rd = uSettingGrad.focal.z - uSettingGrad.settings.z;
let a = 1.0*dot(d1, d1) - 1.0*rd*rd;
let b = 2.0*dot(d0, d1) - 2.0*r0*rd;
let c = 1.0*dot(d0, d0) - 1.0*r0*r0;
let t = (-b + sqrt(b*b - 4*a*c))/(2*a);
let Sc = textureSample(uTextureGrad, uSamplerGrad, vec2f(1.0 - t, 0.5));
let So = uBlendSettings.a;
return vec4f(Sc.rgb * Sc.a * So, Sc.a * So);
}
@ -286,6 +296,7 @@ fn postProcess(d: FragData, R: vec4f) -> vec4f { return R; };
const char* cShaderSrc_Linear_Blend = R"(
struct VertexInput { @location(0) position: vec2f };
struct VertexOutput { @builtin(position) position: vec4f, @location(0) vGradCoord : vec4f, @location(1) vScrCoord: vec2f };
struct GradSettings { settings: vec4f, focal: vec4f };
@group(0) @binding(0) var<uniform> uViewMat : mat4x4f;
@group(1) @binding(0) var<uniform> uModelMat : mat4x4f;
@ -335,13 +346,14 @@ fn postProcess(d: FragData, R: vec4f) -> vec4f { return R; };
const char* cShaderSrc_Radial_Blend = R"(
struct VertexInput { @location(0) position: vec2f };
struct VertexOutput { @builtin(position) position: vec4f, @location(0) vGradCoord : vec4f, @location(1) vScrCoord: vec2f };
struct GradSettings { settings: vec4f, focal: vec4f };
@group(0) @binding(0) var<uniform> uViewMat : mat4x4f;
@group(1) @binding(0) var<uniform> uModelMat : mat4x4f;
@group(1) @binding(1) var<uniform> uBlendSettings : vec4f;
@group(2) @binding(0) var uSamplerGrad : sampler;
@group(2) @binding(1) var uTextureGrad : texture_2d<f32>;
@group(2) @binding(2) var<uniform> uSettingGrad : vec4f;
@group(2) @binding(2) var<uniform> uSettingGrad : GradSettings;
@group(2) @binding(3) var<uniform> uTransformGrad : mat4x4f;
@group(3) @binding(0) var uSamplerDst : sampler;
@group(3) @binding(1) var uTextureDst : texture_2d<f32>;
@ -358,9 +370,15 @@ fn vs_main(in: VertexInput) -> VertexOutput {
struct FragData { Sc: vec3f, Sa: f32, So: f32, Dc: vec3f, Da: f32 };
fn getFragData(in: VertexOutput) -> FragData {
// get source data
let t: f32 = distance(uSettingGrad.zw, in.vGradCoord.xy) / uSettingGrad.r;
let colorSrc = textureSample(uTextureGrad, uSamplerGrad, vec2f(t, 0.5));
let d0 = in.vGradCoord.xy - uSettingGrad.settings.xy;
let d1 = uSettingGrad.settings.xy - uSettingGrad.focal.xy;
let r0 = uSettingGrad.settings.z;
let rd = uSettingGrad.focal.z - uSettingGrad.settings.z;
let a = 1.0*dot(d1, d1) - 1.0*rd*rd;
let b = 2.0*dot(d0, d1) - 2.0*r0*rd;
let c = 1.0*dot(d0, d0) - 1.0*r0*r0;
let t = (-b + sqrt(b*b - 4*a*c))/(2*a);
let colorSrc = textureSample(uTextureGrad, uSamplerGrad, vec2f(1.0 - t, 0.5));
let colorDst = textureSample(uTextureDst, uSamplerDst, in.vScrCoord.xy);
// fill fragment data
var data: FragData;

2
src/renderer/wg_engine/tvgWgShaderTypes.cpp
View file

@ -132,7 +132,7 @@ void WgShaderTypeGradient::update(const RadialGradient* radialGradient)
auto stopCnt = radialGradient->colorStops(&stops);
updateTexData(stops, stopCnt);
// update base points
radialGradient->radial(&settings[2], &settings[3], &settings[0]);
radialGradient->radial(&settings[0], &settings[1], &settings[2], &settings[4], &settings[5], &settings[6]);
};

2
src/renderer/wg_engine/tvgWgShaderTypes.h
View file

@ -65,7 +65,7 @@ struct WgShaderTypeSolidColor
#define WG_TEXTURE_GRADIENT_SIZE 512
struct WgShaderTypeGradient
{
float settings[4]{};
float settings[4+4]{}; // WGSL: struct GradSettings { settings: vec4f, focal: vec4f; transform: mat4f };
uint8_t texData[WG_TEXTURE_GRADIENT_SIZE * 4];
void update(const LinearGradient* linearGradient);