skia2/resources/sksl/shared/MatricesNonsquare.sksl
John Stiles 3c74a5357a Add GLSL workaround for 4x2 diagonal matrix bug.
GLSL now emits 4x2 diagonal matrices as:
	`(mat4x2(1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0) * n)`
instead of
	`mat4x2(n)`.

This works around a long-standing GLSL bug in both Mesa and glslang that
affects several drivers:
https://github.com/KhronosGroup/glslang/issues/2645

Change-Id: If529d5cd150ce720f436cb3634a2fd3423919278
Bug: skia:12003
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/410137
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2021-05-18 22:50:19 +00:00

98 lines
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uniform half4 colorGreen, colorRed;
bool test_float() {
bool ok = true;
float2x3 m23 = float2x3(2);
ok = ok && (m23 == float2x3(2, 0, 0,
0, 2, 0));
float2x4 m24 = float2x4(3);
ok = ok && (m24 == float2x4(3, 0, 0, 0,
0, 3, 0, 0));
float3x2 m32 = float3x2(4);
ok = ok && (m32 == float3x2(4, 0,
0, 4,
0, 0));
float3x4 m34 = float3x4(5);
ok = ok && (m34 == float3x4(5, 0, 0, 0,
0, 5, 0, 0,
0, 0, 5, 0));
float4x2 m42 = float4x2(6);
ok = ok && (m42 == float4x2(6, 0,
0, 6,
0, 0,
0, 0));
float4x3 m43 = float4x3(7);
ok = ok && (m43 == float4x3(7, 0, 0,
0, 7, 0,
0, 0, 7,
0, 0, 0));
float2x2 m22 = m32 * m23;
ok = ok && (m22 == float2x2(2 * 4));
float3x3 m33 = m43 * m34;
ok = ok && (m33 == float3x3(7 * 5));
float4x4 m44 = m24 * m42;
m23 += 1;
ok = ok && (m23 == float2x3(3, 1, 1,
1, 3, 1));
m32 -= 2;
ok = ok && (m32 == float3x2(2, -2,
-2, 2,
-2, -2));
m24 /= 4;
ok = ok && (m24 == float2x4(0.75, 0, 0, 0,
0, 0.75, 0, 0));
return ok;
}
bool test_half() {
bool ok = true;
half2x3 m23 = half2x3(2);
ok = ok && (m23 == half2x3(2, 0, 0,
0, 2, 0));
half2x4 m24 = half2x4(3);
ok = ok && (m24 == half2x4(3, 0, 0, 0,
0, 3, 0, 0));
half3x2 m32 = half3x2(4);
ok = ok && (m32 == half3x2(4, 0,
0, 4,
0, 0));
half3x4 m34 = half3x4(5);
ok = ok && (m34 == half3x4(5, 0, 0, 0,
0, 5, 0, 0,
0, 0, 5, 0));
half4x2 m42 = half4x2(6);
ok = ok && (m42 == half4x2(6, 0,
0, 6,
0, 0,
0, 0));
half4x3 m43 = half4x3(7);
ok = ok && (m43 == half4x3(7, 0, 0,
0, 7, 0,
0, 0, 7,
0, 0, 0));
half2x2 m22 = m32 * m23;
ok = ok && (m22 == half2x2(2 * 4));
half3x3 m33 = m43 * m34;
ok = ok && (m33 == half3x3(7 * 5));
half4x4 m44 = m24 * m42;
m23 += 1;
ok = ok && (m23 == half2x3(3, 1, 1,
1, 3, 1));
m32 -= 2;
ok = ok && (m32 == half3x2(2, -2,
-2, 2,
-2, -2));
m24 /= 4;
ok = ok && (m24 == half2x4(0.75, 0, 0, 0,
0, 0.75, 0, 0));
return ok;
}
half4 main(float2 coords) {
return test_float() && test_half() ? colorGreen : colorRed;
}