SimpleParticleShader.hpp

const std::string SimpleParticleShader::VS = "#version 330 core\n"
"layout ( location = 0 ) in vec3 vertex_position;"
"layout ( location = 4 ) in vec4 position;"
"uniform mat4 M_v;"
"uniform mat4 M_p;"
"uniform float particleSize;"
"out float lifetime;"
"void main()"
"{"
"   vec4 position_viewspace = M_v * vec4( position.xyz , 1 );"
"   position_viewspace.xy += particleSize * (vertex_position.xy - vec2(0.5));"
"   gl_Position = M_p * position_viewspace;"
"   lifetime = position.w;"
"}";

const std::string SimpleParticleShader::FS = "#version 330 core\n"
"in float lifetime;"
"out vec4 fragColor;"
"void main()"
"{"
"   fragColor = vec4( 1.0 );"
"}";