pacc: initial

19 files changed, 312 insertions, 0 deletions

diff --git a/pacc/glsl/Makefile b/pacc/glsl/Makefile
new file mode 100644
index 0000000..36aace4
--- /dev/null
+++ b/pacc/glsl/Makefile
@@ -0,0 +1,40 @@
+VSHADERS:=blit.vert
+FSHADERS:=copy.frag color.frag color_trans.frag key.frag fill.frag font.frag
+DSHEADER:=dsheader
+ESHEADER:=esheader
+INCS:=$(addsuffix .inc,$(VSHADERS) $(FSHADERS) $(DSHEADER) $(ESHEADER))
+SHADERS2:=$(addsuffix .ds.vert,$(basename $(VSHADERS)))
+SHADERS2+=$(addsuffix .es.vert,$(basename $(VSHADERS)))
+SHADERS2+=$(addsuffix .ds.frag,$(basename $(FSHADERS)))
+SHADERS2+=$(addsuffix .es.frag,$(basename $(FSHADERS)))
+VALS:=$(addsuffix .vald,$(SHADERS2))
+VALIDATOR:=glslangValidator
+VFLAGS:=
+
+all:	$(INCS)
+
+val:	$(VALS)
+
+%.es.vert:	%.vert
+	cat $(ESHEADER) $< > $@
+
+%.es.frag:	%.frag
+	cat $(ESHEADER) $< > $@
+
+%.ds.vert:	%.vert
+	cat $(DSHEADER) $< > $@
+
+%.ds.frag:	%.frag
+	cat $(DSHEADER) $< > $@
+
+%.vald:	%
+	$(VALIDATOR) $(VFLAGS) $<
+
+%.inc:	%.zt
+	xxd -i $< | sed -e '/^unsigned char /c\static const uint8_t $(shell echo $(basename $<) | sed -e 's/\./_/g')[] = {' -e '/^unsigned int /c\\' > $@
+
+%.zt:	%
+	dd bs=1 count=1 if=/dev/zero | cat $< - > $@
+
+clean:
+	rm -f $(INCS)
diff --git a/pacc/glsl/blit.vert b/pacc/glsl/blit.vert
new file mode 100644
index 0000000..4232a8d
--- /dev/null
+++ b/pacc/glsl/blit.vert
@@ -0,0 +1,7 @@
+attribute vec4 coord;
+varying vec2 texcoord;
+void main(void) {
+  gl_Position = vec4(coord.xy, 0.0, 1.0);
+  texcoord = coord.zw;
+}
+
diff --git a/pacc/glsl/blit.vert.inc b/pacc/glsl/blit.vert.inc
new file mode 100644
index 0000000..34691a9
--- /dev/null
+++ b/pacc/glsl/blit.vert.inc
@@ -0,0 +1,14 @@
+static const uint8_t blit_vert[] = {
+  0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x20, 0x76, 0x65,
+  0x63, 0x34, 0x20, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x76, 0x61,
+  0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x76, 0x6f, 0x69,
+  0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69, 0x64, 0x29,
+  0x20, 0x7b, 0x0a, 0x20, 0x20, 0x67, 0x6c, 0x5f, 0x50, 0x6f, 0x73, 0x69,
+  0x74, 0x69, 0x6f, 0x6e, 0x20, 0x3d, 0x20, 0x76, 0x65, 0x63, 0x34, 0x28,
+  0x63, 0x6f, 0x6f, 0x72, 0x64, 0x2e, 0x78, 0x79, 0x2c, 0x20, 0x30, 0x2e,
+  0x30, 0x2c, 0x20, 0x31, 0x2e, 0x30, 0x29, 0x3b, 0x0a, 0x20, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x20, 0x3d, 0x20, 0x63, 0x6f,
+  0x6f, 0x72, 0x64, 0x2e, 0x7a, 0x77, 0x3b, 0x0a, 0x7d, 0x0a, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/color.frag b/pacc/glsl/color.frag
new file mode 100644
index 0000000..d03bee5
--- /dev/null
+++ b/pacc/glsl/color.frag
@@ -0,0 +1,13 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+uniform lowp float color;
+void main(void) {
+  lowp float index = texture2D(tex, texcoord).x;
+  if (index > (0.5/255.0)) {
+    index = color;
+  } else {
+    index = 0.5 / 256.0;
+  }
+  gl_FragColor = texture2D(palette, vec2(index, 0.0));
+}
diff --git a/pacc/glsl/color.frag.inc b/pacc/glsl/color.frag.inc
new file mode 100644
index 0000000..8ea77ef
--- /dev/null
+++ b/pacc/glsl/color.frag.inc
@@ -0,0 +1,30 @@
+static const uint8_t color_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73,
+  0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x74, 0x65, 0x78,
+  0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x75, 0x6e, 0x69,
+  0x66, 0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x3b, 0x0a, 0x76,
+  0x6f, 0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69,
+  0x64, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20,
+  0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20,
+  0x3d, 0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28,
+  0x74, 0x65, 0x78, 0x2c, 0x20, 0x74, 0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72,
+  0x64, 0x29, 0x2e, 0x78, 0x3b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28,
+  0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3e, 0x20, 0x28, 0x30, 0x2e, 0x35,
+  0x2f, 0x32, 0x35, 0x35, 0x2e, 0x30, 0x29, 0x29, 0x20, 0x7b, 0x0a, 0x20,
+  0x20, 0x20, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3d, 0x20, 0x63,
+  0x6f, 0x6c, 0x6f, 0x72, 0x3b, 0x0a, 0x20, 0x20, 0x7d, 0x20, 0x65, 0x6c,
+  0x73, 0x65, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6e, 0x64,
+  0x65, 0x78, 0x20, 0x3d, 0x20, 0x30, 0x2e, 0x35, 0x20, 0x2f, 0x20, 0x32,
+  0x35, 0x36, 0x2e, 0x30, 0x3b, 0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20,
+  0x67, 0x6c, 0x5f, 0x46, 0x72, 0x61, 0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72,
+  0x20, 0x3d, 0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44,
+  0x28, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74, 0x65, 0x2c, 0x20, 0x76, 0x65,
+  0x63, 0x32, 0x28, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x2c, 0x20, 0x30, 0x2e,
+  0x30, 0x29, 0x29, 0x3b, 0x0a, 0x7d, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/color_trans.frag b/pacc/glsl/color_trans.frag
new file mode 100644
index 0000000..ef742a4
--- /dev/null
+++ b/pacc/glsl/color_trans.frag
@@ -0,0 +1,11 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+uniform lowp float color;
+void main(void) {
+  lowp float index = texture2D(tex, texcoord).x;
+  if (index < (0.5/255.0)) {
+    discard;
+  }
+  gl_FragColor = texture2D(palette, vec2(color, 0.0));
+}
diff --git a/pacc/glsl/color_trans.frag.inc b/pacc/glsl/color_trans.frag.inc
new file mode 100644
index 0000000..f49404c
--- /dev/null
+++ b/pacc/glsl/color_trans.frag.inc
@@ -0,0 +1,27 @@
+static const uint8_t color_trans_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73,
+  0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x74, 0x65, 0x78,
+  0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x75, 0x6e, 0x69,
+  0x66, 0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x3b, 0x0a, 0x76,
+  0x6f, 0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69,
+  0x64, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20,
+  0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20,
+  0x3d, 0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28,
+  0x74, 0x65, 0x78, 0x2c, 0x20, 0x74, 0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72,
+  0x64, 0x29, 0x2e, 0x78, 0x3b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28,
+  0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3c, 0x20, 0x28, 0x30, 0x2e, 0x35,
+  0x2f, 0x32, 0x35, 0x35, 0x2e, 0x30, 0x29, 0x29, 0x20, 0x7b, 0x0a, 0x20,
+  0x20, 0x20, 0x20, 0x64, 0x69, 0x73, 0x63, 0x61, 0x72, 0x64, 0x3b, 0x0a,
+  0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x67, 0x6c, 0x5f, 0x46, 0x72, 0x61,
+  0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d, 0x20, 0x74, 0x65, 0x78,
+  0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x70, 0x61, 0x6c, 0x65, 0x74,
+  0x74, 0x65, 0x2c, 0x20, 0x76, 0x65, 0x63, 0x32, 0x28, 0x63, 0x6f, 0x6c,
+  0x6f, 0x72, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x29, 0x29, 0x3b, 0x0a, 0x7d,
+  0x0a, 0x00
+};
+
diff --git a/pacc/glsl/copy.frag b/pacc/glsl/copy.frag
new file mode 100644
index 0000000..a77ad91
--- /dev/null
+++ b/pacc/glsl/copy.frag
@@ -0,0 +1,9 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+void main(void) {
+  lowp float index = texture2D(tex, texcoord).x;
+  lowp float color = (index * 255.0 + 0.5) / 256.0;
+  gl_FragColor = texture2D(palette, vec2(color, 0.0));
+}
+
diff --git a/pacc/glsl/copy.frag.inc b/pacc/glsl/copy.frag.inc
new file mode 100644
index 0000000..fa3f388
--- /dev/null
+++ b/pacc/glsl/copy.frag.inc
@@ -0,0 +1,25 @@
+static const uint8_t copy_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73,
+  0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x74, 0x65, 0x78,
+  0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x76, 0x6f, 0x69,
+  0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69, 0x64, 0x29,
+  0x20, 0x7b, 0x0a, 0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3d, 0x20,
+  0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x74, 0x65,
+  0x78, 0x2c, 0x20, 0x74, 0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x29,
+  0x2e, 0x78, 0x3b, 0x0a, 0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66,
+  0x6c, 0x6f, 0x61, 0x74, 0x20, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d,
+  0x20, 0x28, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x2a, 0x20, 0x32, 0x35,
+  0x35, 0x2e, 0x30, 0x20, 0x2b, 0x20, 0x30, 0x2e, 0x35, 0x29, 0x20, 0x2f,
+  0x20, 0x32, 0x35, 0x36, 0x2e, 0x30, 0x3b, 0x0a, 0x20, 0x20, 0x67, 0x6c,
+  0x5f, 0x46, 0x72, 0x61, 0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d,
+  0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x70,
+  0x61, 0x6c, 0x65, 0x74, 0x74, 0x65, 0x2c, 0x20, 0x76, 0x65, 0x63, 0x32,
+  0x28, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x29,
+  0x29, 0x3b, 0x0a, 0x7d, 0x0a, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/dsheader b/pacc/glsl/dsheader
new file mode 100644
index 0000000..13e65b7
--- /dev/null
+++ b/pacc/glsl/dsheader
@@ -0,0 +1,5 @@
+#version 110
+#define lowp
+#define mediump
+#define highp
+
diff --git a/pacc/glsl/dsheader.inc b/pacc/glsl/dsheader.inc
new file mode 100644
index 0000000..b742cec
--- /dev/null
+++ b/pacc/glsl/dsheader.inc
@@ -0,0 +1,8 @@
+static const uint8_t dsheader[] = {
+  0x23, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x31, 0x31, 0x30,
+  0x0a, 0x23, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 0x20, 0x6c, 0x6f, 0x77,
+  0x70, 0x0a, 0x23, 0x64, 0x65, 0x66, 0x69, 0x6e, 0x65, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x0a, 0x23, 0x64, 0x65, 0x66, 0x69, 0x6e,
+  0x65, 0x20, 0x68, 0x69, 0x67, 0x68, 0x70, 0x0a, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/esheader b/pacc/glsl/esheader
new file mode 100644
index 0000000..43b26bc
--- /dev/null
+++ b/pacc/glsl/esheader
@@ -0,0 +1,2 @@
+#version 100
+
diff --git a/pacc/glsl/esheader.inc b/pacc/glsl/esheader.inc
new file mode 100644
index 0000000..3ca61f1
--- /dev/null
+++ b/pacc/glsl/esheader.inc
@@ -0,0 +1,5 @@
+static const uint8_t esheader[] = {
+  0x23, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x20, 0x31, 0x30, 0x30,
+  0x0a, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/fill.frag b/pacc/glsl/fill.frag
new file mode 100644
index 0000000..010b5dc
--- /dev/null
+++ b/pacc/glsl/fill.frag
@@ -0,0 +1,5 @@
+uniform sampler2D palette;
+varying mediump vec2 texcoord;
+void main(void) {
+  gl_FragColor = texture2D(palette, vec2(texcoord.x, 0.0));
+}
diff --git a/pacc/glsl/fill.frag.inc b/pacc/glsl/fill.frag.inc
new file mode 100644
index 0000000..8065199
--- /dev/null
+++ b/pacc/glsl/fill.frag.inc
@@ -0,0 +1,15 @@
+static const uint8_t fill_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d,
+  0x65, 0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20,
+  0x74, 0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x76, 0x6f,
+  0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69, 0x64,
+  0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x67, 0x6c, 0x5f, 0x46, 0x72, 0x61,
+  0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d, 0x20, 0x74, 0x65, 0x78,
+  0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x70, 0x61, 0x6c, 0x65, 0x74,
+  0x74, 0x65, 0x2c, 0x20, 0x76, 0x65, 0x63, 0x32, 0x28, 0x74, 0x65, 0x78,
+  0x63, 0x6f, 0x6f, 0x72, 0x64, 0x2e, 0x78, 0x2c, 0x20, 0x30, 0x2e, 0x30,
+  0x29, 0x29, 0x3b, 0x0a, 0x7d, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/font.frag b/pacc/glsl/font.frag
new file mode 100644
index 0000000..8beb0a7
--- /dev/null
+++ b/pacc/glsl/font.frag
@@ -0,0 +1,15 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+uniform lowp float bg;
+uniform lowp float color;
+void main(void) {
+  gl_FragColor = vec4(1.0, 0.0, 1.0, 1.0);
+  lowp float pixel = texture2D(tex, texcoord).x;
+  lowp float index = color;
+  if (pixel < 0.5) {
+    if (bg < 0.5) discard;
+    index = 0.5 / 256.0;
+  }
+  gl_FragColor = texture2D(palette, vec2(index, 0.0));
+}
diff --git a/pacc/glsl/font.frag.inc b/pacc/glsl/font.frag.inc
new file mode 100644
index 0000000..27d143d
--- /dev/null
+++ b/pacc/glsl/font.frag.inc
@@ -0,0 +1,37 @@
+static const uint8_t font_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73,
+  0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x74, 0x65, 0x78,
+  0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x75, 0x6e, 0x69,
+  0x66, 0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x62, 0x67, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66,
+  0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c, 0x6f,
+  0x61, 0x74, 0x20, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x3b, 0x0a, 0x76, 0x6f,
+  0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69, 0x64,
+  0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x67, 0x6c, 0x5f, 0x46, 0x72, 0x61,
+  0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d, 0x20, 0x76, 0x65, 0x63,
+  0x34, 0x28, 0x31, 0x2e, 0x30, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x2c, 0x20,
+  0x31, 0x2e, 0x30, 0x2c, 0x20, 0x31, 0x2e, 0x30, 0x29, 0x3b, 0x0a, 0x20,
+  0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20,
+  0x70, 0x69, 0x78, 0x65, 0x6c, 0x20, 0x3d, 0x20, 0x74, 0x65, 0x78, 0x74,
+  0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x74, 0x65, 0x78, 0x2c, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x29, 0x2e, 0x78, 0x3b, 0x0a,
+  0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c, 0x6f, 0x61, 0x74,
+  0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3d, 0x20, 0x63, 0x6f, 0x6c,
+  0x6f, 0x72, 0x3b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x70, 0x69,
+  0x78, 0x65, 0x6c, 0x20, 0x3c, 0x20, 0x30, 0x2e, 0x35, 0x29, 0x20, 0x7b,
+  0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28, 0x62, 0x67, 0x20,
+  0x3c, 0x20, 0x30, 0x2e, 0x35, 0x29, 0x20, 0x64, 0x69, 0x73, 0x63, 0x61,
+  0x72, 0x64, 0x3b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x69, 0x6e, 0x64, 0x65,
+  0x78, 0x20, 0x3d, 0x20, 0x30, 0x2e, 0x35, 0x20, 0x2f, 0x20, 0x32, 0x35,
+  0x36, 0x2e, 0x30, 0x3b, 0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x67,
+  0x6c, 0x5f, 0x46, 0x72, 0x61, 0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20,
+  0x3d, 0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28,
+  0x70, 0x61, 0x6c, 0x65, 0x74, 0x74, 0x65, 0x2c, 0x20, 0x76, 0x65, 0x63,
+  0x32, 0x28, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x2c, 0x20, 0x30, 0x2e, 0x30,
+  0x29, 0x29, 0x3b, 0x0a, 0x7d, 0x0a, 0x00
+};
+
diff --git a/pacc/glsl/key.frag b/pacc/glsl/key.frag
new file mode 100644
index 0000000..d6bf7e1
--- /dev/null
+++ b/pacc/glsl/key.frag
@@ -0,0 +1,12 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+uniform lowp float key;
+uniform lowp float color;
+void main(void) {
+  lowp float index = texture2D(tex, texcoord).x;
+  if (index < (key + (0.5/255.0)) || (key + (1.5/255.0)) < index) {
+    discard;
+  }
+  gl_FragColor = texture2D(palette, vec2(color, 0.0));
+}
diff --git a/pacc/glsl/key.frag.inc b/pacc/glsl/key.frag.inc
new file mode 100644
index 0000000..4a4a6c1
--- /dev/null
+++ b/pacc/glsl/key.frag.inc
@@ -0,0 +1,32 @@
+static const uint8_t key_frag[] = {
+  0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73, 0x61, 0x6d, 0x70,
+  0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x70, 0x61, 0x6c, 0x65, 0x74, 0x74,
+  0x65, 0x3b, 0x0a, 0x75, 0x6e, 0x69, 0x66, 0x6f, 0x72, 0x6d, 0x20, 0x73,
+  0x61, 0x6d, 0x70, 0x6c, 0x65, 0x72, 0x32, 0x44, 0x20, 0x74, 0x65, 0x78,
+  0x3b, 0x0a, 0x76, 0x61, 0x72, 0x79, 0x69, 0x6e, 0x67, 0x20, 0x6d, 0x65,
+  0x64, 0x69, 0x75, 0x6d, 0x70, 0x20, 0x76, 0x65, 0x63, 0x32, 0x20, 0x74,
+  0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72, 0x64, 0x3b, 0x0a, 0x75, 0x6e, 0x69,
+  0x66, 0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x6b, 0x65, 0x79, 0x3b, 0x0a, 0x75, 0x6e, 0x69,
+  0x66, 0x6f, 0x72, 0x6d, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20, 0x66, 0x6c,
+  0x6f, 0x61, 0x74, 0x20, 0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x3b, 0x0a, 0x76,
+  0x6f, 0x69, 0x64, 0x20, 0x6d, 0x61, 0x69, 0x6e, 0x28, 0x76, 0x6f, 0x69,
+  0x64, 0x29, 0x20, 0x7b, 0x0a, 0x20, 0x20, 0x6c, 0x6f, 0x77, 0x70, 0x20,
+  0x66, 0x6c, 0x6f, 0x61, 0x74, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x20,
+  0x3d, 0x20, 0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28,
+  0x74, 0x65, 0x78, 0x2c, 0x20, 0x74, 0x65, 0x78, 0x63, 0x6f, 0x6f, 0x72,
+  0x64, 0x29, 0x2e, 0x78, 0x3b, 0x0a, 0x20, 0x20, 0x69, 0x66, 0x20, 0x28,
+  0x69, 0x6e, 0x64, 0x65, 0x78, 0x20, 0x3c, 0x20, 0x28, 0x6b, 0x65, 0x79,
+  0x20, 0x2b, 0x20, 0x28, 0x30, 0x2e, 0x35, 0x2f, 0x32, 0x35, 0x35, 0x2e,
+  0x30, 0x29, 0x29, 0x20, 0x7c, 0x7c, 0x20, 0x28, 0x6b, 0x65, 0x79, 0x20,
+  0x2b, 0x20, 0x28, 0x31, 0x2e, 0x35, 0x2f, 0x32, 0x35, 0x35, 0x2e, 0x30,
+  0x29, 0x29, 0x20, 0x3c, 0x20, 0x69, 0x6e, 0x64, 0x65, 0x78, 0x29, 0x20,
+  0x7b, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x64, 0x69, 0x73, 0x63, 0x61, 0x72,
+  0x64, 0x3b, 0x0a, 0x20, 0x20, 0x7d, 0x0a, 0x20, 0x20, 0x67, 0x6c, 0x5f,
+  0x46, 0x72, 0x61, 0x67, 0x43, 0x6f, 0x6c, 0x6f, 0x72, 0x20, 0x3d, 0x20,
+  0x74, 0x65, 0x78, 0x74, 0x75, 0x72, 0x65, 0x32, 0x44, 0x28, 0x70, 0x61,
+  0x6c, 0x65, 0x74, 0x74, 0x65, 0x2c, 0x20, 0x76, 0x65, 0x63, 0x32, 0x28,
+  0x63, 0x6f, 0x6c, 0x6f, 0x72, 0x2c, 0x20, 0x30, 0x2e, 0x30, 0x29, 0x29,
+  0x3b, 0x0a, 0x7d, 0x0a, 0x00
+};
+