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Grids now render properly at large zoom levels

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This commit is contained in:
Yousef Khadadeh 2025-09-13 14:31:29 +03:00
parent 8cb89c40d6
commit ad4e5af294
3 changed files with 62 additions and 30 deletions
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86
src/WorldGrid.cpp
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@ -8,19 +8,17 @@ sk_sp<SkRuntimeEffect> WorldGrid::squareLinesEffect;
sk_sp<SkRuntimeEffect> WorldGrid::ruledEffect;
Vector2f WorldGrid::oldWindowSize = Vector2f{0.0f, 0.0f};
#define GRID_CACHE_SIZE 10.0f
#define GRID_CACHE_SIZE_INT 10
// NOTE: Skia shaders return premultiplied alpha colors
const char* circlePointShaderCode = R"V(
uniform vec4 gridColor;
uniform float gridScale;
uniform vec2 gridClosestPoint;
uniform float gridPointSize;
vec4 main(float2 fragCoord) {
float circleRadius = min(5.0 / gridScale, 0.25);
float2 modCoord = mod(fragCoord + float2(5.0), float2(10.0));
float fin = step(distance(float2(5.0), modCoord), circleRadius);
float2 modCoord = mod(fragCoord - gridClosestPoint + float2(0.5 * gridScale), float2(gridScale));
float fin = step(distance(modCoord, float2(0.5 * gridScale)), gridPointSize);
vec4 pointColorUnmultiplied = vec4(gridColor.rgb, 1.0);
@ -30,12 +28,14 @@ vec4 main(float2 fragCoord) {
const char* squarePointShaderCode = R"V(
uniform vec4 gridColor;
uniform float gridScale;
uniform vec2 gridClosestPoint;
uniform float gridPointSize;
vec4 main(float2 fragCoord) {
float squareSize = min(10.0 / gridScale, 0.5);
float gridUnit = 1.0 / gridScale;
float m1 = step(mod(fragCoord.x + gridUnit + squareSize * 0.5, 10.0), squareSize);
float m2 = step(mod(fragCoord.y + gridUnit + squareSize * 0.5, 10.0), squareSize);
float2 modCoord = mod(fragCoord - gridClosestPoint + float2(0.5 * gridScale), float2(gridScale));
float2 difToPointCenter = abs(modCoord - float2(0.5 * gridScale));
float m1 = step(difToPointCenter.x, gridPointSize);
float m2 = step(difToPointCenter.y, gridPointSize);
float fin = m1 * m2;
vec4 pointColorUnmultiplied = vec4(gridColor.rgb, 1.0);
@ -46,11 +46,14 @@ vec4 main(float2 fragCoord) {
const char* squareLinesShaderCode = R"V(
uniform vec4 gridColor;
uniform float gridScale;
uniform vec2 gridClosestPoint;
uniform float gridPointSize;
vec4 main(float2 fragCoord) {
float gridUnit = 1.0 / gridScale;
float m1 = step(mod(fragCoord.x + gridUnit, 10.0), gridUnit);
float m2 = step(mod(fragCoord.y + gridUnit, 10.0), gridUnit);
float2 modCoord = mod(fragCoord - gridClosestPoint + float2(0.5 * gridScale), float2(gridScale));
float2 difToPointCenter = abs(modCoord - float2(0.5 * gridScale));
float m1 = step(difToPointCenter.x, gridPointSize);
float m2 = step(difToPointCenter.y, gridPointSize);
float fin = max(m1, m2);
vec4 pointColorUnmultiplied = vec4(gridColor.rgb, 1.0);
@ -61,10 +64,13 @@ vec4 main(float2 fragCoord) {
const char* ruledShaderCode = R"V(
uniform vec4 gridColor;
uniform float gridScale;
uniform vec2 gridClosestPoint;
uniform float gridPointSize;
vec4 main(float2 fragCoord) {
float gridUnit = 1.0 / gridScale;
float fin = step(mod(fragCoord.y + gridUnit, 10.0), gridUnit);
float2 modCoord = mod(fragCoord - gridClosestPoint + float2(0.5 * gridScale), float2(gridScale));
float2 difToPointCenter = abs(modCoord - float2(0.5 * gridScale));
float fin = step(difToPointCenter.y, gridPointSize);
vec4 pointColorUnmultiplied = vec4(gridColor.rgb, 1.0);
@ -81,7 +87,7 @@ sk_sp<SkRuntimeEffect> WorldGrid::compile_effect_shader_init(const char* shaderN
return effect;
}
sk_sp<SkShader> WorldGrid::get_shader(GridType gType, const SkColor4f& gridColor, float gridScale) {
sk_sp<SkShader> WorldGrid::get_shader(GridType gType, const SkColor4f& gridColor, float gridScale, const Vector2f& gridClosestPoint, float gridPointSize) {
sk_sp<SkRuntimeEffect> runtimeEffect;
switch(gType) {
case GridType::CIRCLE_POINTS:
@ -99,7 +105,22 @@ sk_sp<SkShader> WorldGrid::get_shader(GridType gType, const SkColor4f& gridColor
}
SkRuntimeShaderBuilder builder(runtimeEffect);
builder.uniform("gridColor") = gridColor;
builder.uniform("gridScale") = 1.0f;
builder.uniform("gridScale") = std::min(gridScale, 100000.0f); // Limit placed so that having a massive floating point value doesnt tank precision in the shader
builder.uniform("gridClosestPoint").set(gridClosestPoint.data(), 2);
switch(gType) {
case GridType::CIRCLE_POINTS:
builder.uniform("gridPointSize") = gridPointSize;
break;
case GridType::SQUARE_POINTS:
builder.uniform("gridPointSize") = gridPointSize;
break;
case GridType::SQUARE_LINES:
builder.uniform("gridPointSize") = 0.5f;
break;
case GridType::RULED:
builder.uniform("gridPointSize") = 0.5f;
break;
}
sk_sp<SkShader> s = builder.makeShader();
return s;
}
@ -115,22 +136,33 @@ void WorldGrid::draw(GridManager& gMan, SkCanvas* canvas, const DrawData& drawDa
ruledEffect = compile_effect_shader_init("Ruled", ruledShaderCode);
}
float alteredZoom = static_cast<float>(((size / WorldScalar(GRID_CACHE_SIZE_INT)) / drawData.cam.c.inverseScale));
if(alteredZoom > 0.4f) {
WorldVec fracCamPosWorld;
WorldScalar worldSize = size / drawData.cam.c.inverseScale;
float floatWorldSize = static_cast<float>(worldSize);
if(worldSize > WorldScalar(7)) {
WorldVec fracCamPosOnGrid;
fracCamPosOnGrid.x() = (drawData.cam.c.pos.x() + offset.x()) % size;
fracCamPosOnGrid.y() = (drawData.cam.c.pos.y() + offset.y()) % size;
fracCamPosWorld.x() = ((drawData.cam.c.pos.x() + offset.x()) % size) / drawData.cam.c.inverseScale;
fracCamPosWorld.y() = ((drawData.cam.c.pos.y() + offset.y()) % size) / drawData.cam.c.inverseScale;
WorldVec closestGridPoint;
closestGridPoint.x() = (fracCamPosOnGrid.x() < size / WorldScalar(2)) ? WorldScalar(0) : size;
closestGridPoint.y() = (fracCamPosOnGrid.y() < size / WorldScalar(2)) ? WorldScalar(0) : size;
Vector2f fracCamPos = fracCamPosWorld.cast<float>();
Vector2f closestGridPointScreenPos;
closestGridPointScreenPos.x() = static_cast<float>((closestGridPoint.x() - fracCamPosOnGrid.x()) / drawData.cam.c.inverseScale);
closestGridPointScreenPos.y() = static_cast<float>((closestGridPoint.y() - fracCamPosOnGrid.y()) / drawData.cam.c.inverseScale);
std::cout << "frac cam point: " << vec_pretty(fracCamPosOnGrid) << std::endl;
std::cout << "closest grid point: " << vec_pretty(closestGridPoint) << std::endl;
std::cout << "closest grid point screen: " << vec_pretty(closestGridPointScreenPos) << std::endl;
std::cout << "worldSize: " << floatWorldSize << std::endl;
SkPaint linePaint;
SkColor4f pointColor = gMan.world.canvasTheme.toolFrontColor;
pointColor.fA = std::clamp(alteredZoom / 20.0f, 0.0f, 0.4f);
linePaint.setShader(get_shader(gridType, pointColor, alteredZoom));
pointColor.fA = std::clamp(floatWorldSize / 50.0f, 0.0f, 0.4f);
float gridPointSize = std::clamp(floatWorldSize / 10.0f, 0.0f, 5.0f);
linePaint.setShader(get_shader(gridType, pointColor, static_cast<float>(worldSize), closestGridPointScreenPos, gridPointSize));
canvas->save();
canvas->translate(-fracCamPos.x(), -fracCamPos.y());
canvas->rotate(-drawData.cam.c.rotation * 180.0 / std::numbers::pi);
canvas->drawPaint(linePaint);
canvas->restore();
}