Ilia Denisov
115 lines
2.6 KiB
Go
115 lines
2.6 KiB
Go
package world
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import (
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestRender_PanSmall_UsesCopyShiftAndRendersOnlyDirtyStrips(t *testing.T) {
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t.Parallel()
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w := NewWorld(10, 10)
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w.resetGrid(2 * SCALE)
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_, err := w.AddPoint(5, 5)
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require.NoError(t, err)
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_, err = w.AddCircle(2, 2, 1)
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require.NoError(t, err)
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_, err = w.AddLine(9, 5, 1, 5)
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require.NoError(t, err)
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for _, obj := range w.objects {
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w.indexObject(obj)
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}
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params := RenderParams{
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ViewportWidthPx: 10,
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ViewportHeightPx: 10,
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MarginXPx: 4, // threshold=2
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MarginYPx: 4, // threshold=2
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CameraXWorldFp: 5 * SCALE,
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CameraYWorldFp: 5 * SCALE,
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CameraZoom: 1.0,
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}
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// First render initializes state (full redraw).
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d0 := &fakePrimitiveDrawer{}
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require.NoError(t, w.Render(d0, params))
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// Pan right by 1 unit => dx=-1 => incremental shift expected.
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params2 := params
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params2.CameraXWorldFp += 1 * SCALE
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d := &fakePrimitiveDrawer{}
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err = w.Render(d, params2)
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require.NoError(t, err)
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// Must contain CopyShift for incremental path.
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require.NotEmpty(t, d.CommandsByName("CopyShift"))
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// All clip rects should be "small": width <= 1 for dx=-1 strip.
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clipCmds := d.CommandsByName("ClipRect")
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require.NotEmpty(t, clipCmds)
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for _, c := range clipCmds {
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wPx := int(c.Args[2])
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hPx := int(c.Args[3])
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require.LessOrEqual(t, wPx, 2)
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require.LessOrEqual(t, hPx, params2.CanvasHeightPx())
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}
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require.NotEmpty(t, d.CommandsByName("AddPoint"))
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require.NotEmpty(t, d.CommandsByName("AddCircle"))
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require.NotEmpty(t, d.CommandsByName("AddLine"))
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}
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func TestRender_PanTooLarge_FallsBackToFullRedraw(t *testing.T) {
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t.Parallel()
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w := NewWorld(10, 10)
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w.resetGrid(2 * SCALE)
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_, err := w.AddPoint(5, 5)
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require.NoError(t, err)
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for _, obj := range w.objects {
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w.indexObject(obj)
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}
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params := RenderParams{
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ViewportWidthPx: 10,
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ViewportHeightPx: 10,
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MarginXPx: 4, // threshold=2
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MarginYPx: 4,
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CameraXWorldFp: 5 * SCALE,
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CameraYWorldFp: 5 * SCALE,
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CameraZoom: 1.0,
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}
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d0 := &fakePrimitiveDrawer{}
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require.NoError(t, w.Render(d0, params))
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// Pan right by 3 units => abs(dx)=3 > threshold(2) => full redraw expected.
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params2 := params
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params2.CameraXWorldFp += 3 * SCALE
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d := &fakePrimitiveDrawer{}
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err = w.Render(d, params2)
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require.NoError(t, err)
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// Full redraw should NOT call CopyShift.
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require.Empty(t, d.CommandsByName("CopyShift"))
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// Should contain at least one reasonably wide clip.
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clipCmds := d.CommandsByName("ClipRect")
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require.NotEmpty(t, clipCmds)
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foundWide := false
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for _, c := range clipCmds {
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if int(c.Args[2]) > 1 {
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foundWide = true
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break
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}
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}
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require.True(t, foundWide)
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}
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