feat: double buffered video input

default/forge_project.cfg

@@ -51,6 +51,8 @@ UNIFORM_STATE_PREFIX=iState
 UNIFORM_ACTIVE_PREFIX=iActive
 # Input X format raw integer value
 UNIFORM_IN_FORMAT_PREFIX=iInputFormat
+# Input X should use swap texture or not (0/1)
+UNIFORM_IN_SWAP_PREFIX=iInputSwap
 
 # --- uniform vec2 ---
 
@@ -93,7 +95,7 @@ SUB_2_PREFIX=fx_
 
 
 # Total number of internal textures
-TEX_COUNT=10
+TEX_COUNT=12
 
 # === VIDEO DEVICES
 # Video devices will be read from CLI arguments
@@ -104,10 +106,12 @@ IN_COUNT=2
 # To which texture will be bound video device X
 IN_1_OUT=1
 IN_2_OUT=2
+# To which texture will be bound swap buffers (for double-buffering)
+IN_1_SWAP_OUT=3
+IN_2_SWAP_OUT=4
 
 # === FRAGMENT SHADERS
 # Fragment shaders will be read from the CLI directory as "fragX.glsl"
-# Special shader "frag0.glsl" will be prepend to each one
 
 # Prefix of fragment shaders to detect
 FRAG_FILE_PREFIX=frag
@@ -116,13 +120,13 @@ FRAG_FILE_PREFIX=frag
 FRAG_COUNT=10
 
 # To which texture will the shader fragX.glsl will render to
-FRAG_1_OUT=3
-FRAG_2_OUT=4
-FRAG_3_OUT=5
-FRAG_4_OUT=6
-FRAG_5_OUT=7
-FRAG_6_OUT=8
-FRAG_7_OUT=9
+FRAG_1_OUT=5
+FRAG_2_OUT=6
+FRAG_3_OUT=7
+FRAG_4_OUT=8
+FRAG_5_OUT=9
+FRAG_6_OUT=10
+FRAG_7_OUT=11
 FRAG_8_OUT=0
 # Which fragment shader renders to output window
 FRAG_OUTPUT=9