graphics

commit f3b08ddd7c7ad2acf03bb8c8ef49047f1922d721
parent d391a6083cbaaae1caf07e7af514a501093f473a
Author: Brian Swetland <swetland@frotz.net>
Date:   Sun, 15 Sep 2013 05:21:41 -0700

rectangle.glsl - various effects for copy-texture-to-screen

Diffstat:
A
common/assets/rectangle.glsl
 | 
76
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 76 insertions(+), 0 deletions(-)
diff --git a/common/assets/rectangle.glsl b/common/assets/rectangle.glsl
@@ -0,0 +1,76 @@
+#version 140
+#extension GL_ARB_explicit_attrib_location : enable
+
+-- vertex
+
+layout (location = 0) in vec4 aPosition;
+layout (location = 1) in vec2 aTexCoord;
+
+out vec2 vTexCoord;
+
+void main() {
+	vTexCoord = aTexCoord;
+	gl_Position = aPosition;
+}
+
+-- fragment
+
+uniform sampler2DRect sampler0;
+
+uniform float offset[3] =
+	float[]( 0.0, 1.3846153846, 3.2307692308 );
+uniform float weight[3] =
+	float[]( 0.2270270270, 0.3162162162, 0.0702702703 );
+
+in vec2 vTexCoord;
+
+layout (location = 0) out vec4 fColor;
+
+void main() {
+#ifdef SKIPLINES
+	if ((int(gl_FragCoord.y) & 1) == 1) {
+		discard;
+		return;
+	}
+#endif
+#ifdef SKIP2LINES
+	if ((int(gl_FragCoord.y) & 3) < 2) {
+		discard;
+		return;
+	}
+#endif
+#ifdef PIXELATE
+	fColor = texture(sampler0, floor(gl_FragCoord.xy / 8.0) * 8.0);
+#endif
+#ifdef GRAY
+	float gray = dot(texture(sampler0, gl_FragCoord.xy).rgb, vec3(0.299, 0.587, 0.114));
+	fColor = vec4(gray, gray, gray, 1.0);
+#endif
+#ifdef GREEN
+	float gray = dot(texture(sampler0, gl_FragCoord.xy).rgb, vec3(0.299, 0.587, 0.114));
+	fColor = vec4(vec3(0.0, 1.0, 0.0) * gray, 1.0);
+#endif
+#ifdef HBLUR
+	vec2 xy = gl_FragCoord.xy;
+	vec4 c = texture(sampler0, xy / 1.0) * weight[0];
+	for (int i = 1; i < 3; i++) {
+		vec2 delta = vec2(offset[i], 0);
+		c += texture(sampler0, (xy + delta) / 1.0) * weight[i];
+		c += texture(sampler0, (xy - delta) / 1.0) * weight[i];
+	}
+	fColor = c;
+#endif
+#ifdef VBLUR
+	vec2 xy = gl_FragCoord.xy;
+	vec4 c = texture(sampler0, xy / 1.0) * weight[0];
+	for (int i = 1; i < 3; i++) {
+		vec2 delta = vec2(0, offset[i]);
+		c += texture(sampler0, (xy + delta) / 1.0) * weight[i];
+		c += texture(sampler0, (xy - delta) / 1.0) * weight[i];
+	}
+	fColor = c;
+#endif
+#ifdef COPY
+	fColor = texture(sampler0, gl_FragCoord.xy);
+#endif
+}