REXM: Updated some examples inconsistencies

examples/others/resources/shaders/glsl120/point_particle.fs

@@ -0,0 +1,14 @@
+#version 120
+
+// Input uniform values
+uniform vec4 color;
+
+// NOTE: Add your custom variables here
+
+void main()
+{
+    // Each point is drawn as a screen space square of gl_PointSize size. gl_PointCoord contains where we are inside of
+    // it. (0, 0) is the top left, (1, 1) the bottom right corner
+    // Draw each point as a colored circle with alpha 1.0 in the center and 0.0 at the outer edges
+    gl_FragColor = vec4(color.rgb, color.a*(1.0 - length(gl_PointCoord.xy - vec2(0.5))*2.0));
+}

examples/others/resources/shaders/glsl120/point_particle.vs

@@ -0,0 +1,24 @@
+#version 120
+
+// Input vertex attributes
+attribute vec3 vertexPosition;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform float currentTime;
+
+// NOTE: Add your custom variables here
+
+void main()
+{
+    // Unpack data from vertexPosition
+    vec2  pos    = vertexPosition.xy;
+    float period = vertexPosition.z;
+
+    // Calculate final vertex position (jiggle it around a bit horizontally)
+    pos += vec2(100.0, 0.0)*sin(period*currentTime);
+    gl_Position = mvp*vec4(pos.x, pos.y, 0.0, 1.0);
+
+    // Calculate the screen space size of this particle (also vary it over time)
+    gl_PointSize = 10.0 - 5.0*abs(sin(period*currentTime));
+}