43 lines
1.3 KiB
GLSL
43 lines
1.3 KiB
GLSL
#import "Common/ShaderLib/GLSLCompat.glsllib"
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uniform mat4 g_WorldViewProjectionMatrix;
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uniform mat4 g_WorldMatrix;
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uniform float g_Time;
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uniform float m_WindStrength;
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uniform float m_WindSpeed;
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uniform vec2 m_WindDir;
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in vec3 inPosition;
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in vec3 inNormal;
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in vec2 inTexCoord;
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in vec4 inColor; // R = Wind-Gewicht (0 = Wurzel, 1 = Spitze)
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out vec2 texCoord;
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out vec3 worldNormal;
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void main() {
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float windW = inColor.r;
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float t = g_Time * m_WindSpeed;
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vec4 worldPos = g_WorldMatrix * vec4(inPosition, 1.0);
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vec2 worldXZ = worldPos.xz;
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vec2 windN = (dot(m_WindDir, m_WindDir) > 0.001) ? normalize(m_WindDir) : vec2(0.0, 1.0);
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vec2 perpN = vec2(-windN.y, windN.x);
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float wavePhase = dot(worldXZ, windN);
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float randPhase = fract(sin(dot(worldXZ, vec2(127.1, 311.7))) * 43758.5453) * 6.2832;
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float mainSway = sin(t + wavePhase * 0.08 + randPhase) * windW * m_WindStrength;
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float crossSway = cos(t * 0.73 + wavePhase * 0.06 + randPhase) * windW * m_WindStrength * 0.25;
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vec3 animPos = inPosition + vec3(
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windN.x * mainSway + perpN.x * crossSway,
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0.0,
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windN.y * mainSway + perpN.y * crossSway
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);
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gl_Position = g_WorldViewProjectionMatrix * vec4(animPos, 1.0);
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texCoord = inTexCoord;
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worldNormal = normalize((g_WorldMatrix * vec4(inNormal, 0.0)).xyz);
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}
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