enable hidpi

linux-hidpi/glava/graph/3.frag

@@ -0,0 +1,104 @@
+
+in vec4 gl_FragCoord;
+
+#request uniform "screen" screen
+uniform ivec2 screen; /* screen dimensions */
+
+#request uniform "prev" tex
+uniform sampler2D tex;    /* screen texture    */
+
+out vec4 fragment; /* output */
+
+#include "@graph.glsl"
+#include ":graph.glsl"
+
+#if ANTI_ALIAS == 0
+#error __disablestage
+#endif
+
+/* Moves toward the border of the graph, gives the
+   y coordinate of the last colored pixel */
+float get_col_height_up(float x, float oy) {
+    float y = oy;
+    #if INVERT > 0
+    while (y >= 0) {
+    #else
+    while (y < screen.y) {
+    #endif
+        vec4 f = texelFetch(tex, ivec2(x, y), 0);
+        if (f.a <= 0) {
+            #if INVERT > 0
+            y += 1;
+            #else
+            y -= 1;
+            #endif
+            break;
+        }
+        #if INVERT > 0
+        y -= 1;
+        #else
+        y += 1;
+        #endif
+    }
+
+    return y;
+}
+
+/* Moves toward the base of the graph, gives the
+   y coordinate of the first colored pixel */
+float get_col_height_down(float x, float oy) {
+    float y = oy;
+    #if INVERT > 0
+    while (y < screen.y) {
+    #else
+    while (y >= 0) {
+    #endif
+        vec4 f = texelFetch(tex, ivec2(x, y), 0);
+        if (f.a > 0) {
+            break;
+        }
+        #if INVERT > 0
+        y += 1;
+        #else
+        y -= 1;
+        #endif
+    }
+
+    return y;
+}
+
+void main() {
+    fragment = texelFetch(tex, ivec2(gl_FragCoord.x, gl_FragCoord.y), 0);
+
+    #if ANTI_ALIAS > 0
+
+    if (fragment.a <= 0) {
+        bool left_done = false;
+        float h2;
+        float a_fact = 0;
+
+        if (texelFetch(tex, ivec2(gl_FragCoord.x - 1, gl_FragCoord.y), 0).a > 0) {
+            float h1 = get_col_height_up(gl_FragCoord.x - 1, gl_FragCoord.y);
+            h2 = get_col_height_down(gl_FragCoord.x, gl_FragCoord.y);
+            fragment = texelFetch(tex, ivec2(gl_FragCoord.x, h2), 0);
+
+            a_fact = clamp(abs((h1 - gl_FragCoord.y) / (h2 - h1)), 0.0, 1.0);
+
+            left_done = true;
+        }
+        if (texelFetch(tex, ivec2(gl_FragCoord.x + 1, gl_FragCoord.y), 0).a > 0) {
+            if (!left_done) {
+                h2 = get_col_height_down(gl_FragCoord.x, gl_FragCoord.y);
+                fragment = texelFetch(tex, ivec2(gl_FragCoord.x, h2), 0);
+            }
+            float h3 = get_col_height_up(gl_FragCoord.x + 1, gl_FragCoord.y);
+
+            a_fact = max(a_fact, clamp(abs((h3 - gl_FragCoord.y) / (h2 - h3)), 0.0, 1.0));
+        }
+        
+        fragment.a *= a_fact;
+
+    }
+
+    #endif
+}