49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
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def write(vert):
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vert.add_uniform('mat4 pd', '_particleData')
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str_tex_hash = "float fhash(float n) { return fract(sin(n) * 43758.5453); }"
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vert.add_function(str_tex_hash)
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# var ptime = (count - p.i) * spawnRate;
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vert.write('float ptime = (pd[0][0] - gl_InstanceID) * pd[0][1];')
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# ptime -= ptime * fhash(i) * r.lifetime_random;
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vert.write('ptime -= ptime * fhash(gl_InstanceID) * pd[2][3];')
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# lifetime
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# todo: properly discard
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vert.write('if (gl_InstanceID > pd[0][0] || ptime < 0 || ptime > pd[0][2]) { spos.x = spos.y = spos.z = -99999; }')
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vert.write('ptime /= 2;')
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# object_align_factor / 2 + gxyz
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vert.write('vec3 ppos = vec3(pd[1][0], pd[1][1], pd[1][2]);')
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# factor_random = pd[1][3]
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# p.i = gl_InstanceID
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# particles.length = pd[0][3]
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vert.write('ppos.x += fhash(gl_InstanceID) * pd[1][3] - pd[1][3] / 2;')
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vert.write('ppos.y += fhash(gl_InstanceID + pd[0][3]) * pd[1][3] - pd[1][3] / 2;')
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vert.write('ppos.z += fhash(gl_InstanceID + 2 * pd[0][3]) * pd[1][3] - pd[1][3] / 2;')
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# gxyz
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vert.write('ppos.x += (pd[2][0] * ptime) / 5;')
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vert.write('ppos.y += (pd[2][1] * ptime) / 5;')
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vert.write('ppos.z += (pd[2][2] * ptime) / 5;')
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vert.write('ppos.x *= ptime;')
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vert.write('ppos.y *= ptime;')
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vert.write('ppos.z *= ptime;')
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vert.write('spos.xyz += ppos;')
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def write_tilesheet(vert):
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# tilesx, tilesy, framerate - pd[3][0], pd[3][1], pd[3][2]
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vert.write('int frame = int((ptime / 2) / pd[3][2]);')
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vert.write('int tx = frame % int(pd[3][0]);')
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vert.write('int ty = int(frame / pd[3][0]);')
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vert.write('vec2 tilesheetOffset = vec2(tx * (1 / pd[3][0]), ty * (1 / pd[3][1]));')
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vert.write('texCoord = tex + tilesheetOffset;')
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# vert.write('texCoord = tex;')
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