107 lines
2.5 KiB
Plaintext
107 lines
2.5 KiB
Plaintext
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#version 460 core
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struct GenericData
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{
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//! Delta time
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float dt;
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//! Elapsed time of the application
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float elapsedTime;
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//! Viewport width of the scene (excluding imgui, that means smaller than window)
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uint viewportWidth;
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//! Ditto but for height
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uint viewportHeight;
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};
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struct ParticleData
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{
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vec4 position;
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vec4 orientationSpeedDecay;
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vec4 velocity;
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vec4 acceleration;
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vec4 scaleAndDecay;
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vec4 colorTint;
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vec4 colorDecay;
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float life;
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uint textureIndex;
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};
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layout (set = 0, binding = 0) uniform GenericDataBuffer
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{
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GenericData data;
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} genericDataBuffer;
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layout(set = 1, binding = 0) uniform CameraData
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{
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vec4 position;
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mat4 vpMat;
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mat4 viewMat;
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mat4 projMat;
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} cameraData;
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// output buffer not needed
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layout (std430, set = 2, binding = 2) coherent restrict buffer ParticlesOutputBuffer
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{
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ParticleData data[];
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} outputParticles;
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layout (std430, set = 2, binding = 4) coherent restrict buffer IndicesData
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{
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uint indices[];
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};
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// between shader stages
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layout(location = 0) out struct
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{
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vec2 uv; // location = 0
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} Out;
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// material stuff
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layout(location = 1) out struct
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{
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uint textureIndex; // location = 1
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vec4 color; // location = 2
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} OutFlat;
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vec2 CreateQuad (in uint vertexID)
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{
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uint b = 1 << vertexID;
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return vec2 ((0x3 & b) != 0, (0x9 & b) != 0);
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}
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void main()
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{
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// Create a quad and its texture coordinates
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Out.uv = CreateQuad (gl_VertexIndex);
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vec3 vertexPos = vec3 (Out.uv - vec2(0.5f), 0.0f);
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vertexPos.y *= 0.5f;
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ParticleData particle = outputParticles.data[indices[gl_InstanceIndex]];
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vec3 normalized = normalize (vec3 (particle.velocity.xyz));
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float pitch = acos (dot (normalized.xyz, normalize (vec3 (normalized.x, 0.0f, normalized.z))));
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float angle = pitch;
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// float angle = atan (normalized.y, normalized.x);
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vec2 particleScaleData = particle.scaleAndDecay.xy; // x and y
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mat3 rotate = mat3 (1.0f);
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rotate[0][0] = cos(angle);
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rotate[0][1] = sin(angle);
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rotate[1][0] = -sin(angle);
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rotate[1][1] = cos(angle);
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vec3 particlePos = rotate * vertexPos;
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vec3 viewRight = normalize (vec3 (cameraData.viewMat[0][0], cameraData.viewMat[1][0], cameraData.viewMat[2][0]));
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vec3 viewUp = normalize(vec3 (cameraData.viewMat[0][1], cameraData.viewMat[1][1], cameraData.viewMat[2][1]));
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particlePos = particle.position.xyz + (viewRight * particlePos.x * particleScaleData.x) + (viewUp * particlePos.y * particleScaleData.y);
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OutFlat.textureIndex = particle.textureIndex;
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OutFlat.color = particle.colorTint;
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gl_Position = cameraData.vpMat * vec4(particlePos, 1.0f);
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}
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