Updated compute shader particle system with point sprites and gradient coloring

data/shaders/computeparticles/particle.comp

@@ -7,6 +7,7 @@ struct Particle
 {
 	vec2 pos;
 	vec2 vel;
+	vec4 gradientPos;
 };
 
 // Binding 0 : Position storage buffer
@@ -71,5 +72,8 @@ void main()
 
     // Write back
     particles[index].vel.xy = vVel;
+	particles[index].gradientPos.x += 0.02 * ubo.deltaT;
+	if (particles[index].gradientPos.x > 1.0)
+		particles[index].gradientPos.x -= 1.0;
 }
 

data/shaders/computeparticles/particle.frag

@@ -3,11 +3,16 @@
 #extension GL_ARB_separate_shader_objects : enable
 #extension GL_ARB_shading_language_420pack : enable
 
+layout (binding = 0) uniform sampler2D samplerColorMap;
+layout (binding = 1) uniform sampler2D samplerGradientRamp;
+
 layout (location = 0) in vec4 inColor;
+layout (location = 1) in float inGradientPos;
 
 layout (location = 0) out vec4 outFragColor;
 
 void main () 
 {
-	outFragColor = inColor;
+	vec3 color = texture(samplerGradientRamp, vec2(inGradientPos, 0.0)).rgb;
+	outFragColor.rgb = texture(samplerColorMap, gl_PointCoord).rgb * color;
 }

data/shaders/computeparticles/particle.vert

@@ -4,12 +4,21 @@
 #extension GL_ARB_shading_language_420pack : enable
 
 layout (location = 0) in vec2 inPos;
+layout (location = 1) in vec4 inGradientPos;
 
 layout (location = 0) out vec4 outColor;
+layout (location = 1) out float outGradientPos;
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+	float gl_PointSize;
+};
 
 void main () 
 {
-  gl_PointSize = 1.0;
+  gl_PointSize = 8.0;
   outColor = vec4(0.035);
+  outGradientPos = inGradientPos.x;
   gl_Position = vec4(inPos.xy, 1.0, 1.0);
 }