corregit compile_spirv.cmake y la system_folder per a shaders

tools/shaders/compile_spirv.cmake

@@ -9,19 +9,65 @@
 #   cmake -D GLSLC=glslc -D SHADERS_DIR=data/shaders -D HEADERS_DIR=source/core/rendering/sdl3gpu -P tools/shaders/compile_spirv.cmake
 
 cmake_minimum_required(VERSION 3.10)
+cmake_policy(SET CMP0007 NEW)
 
-foreach(SHADER vert frag)
-    set(SRC "${SHADERS_DIR}/postfx.${SHADER}")
-    set(SPV "${HEADERS_DIR}/postfx_${SHADER}.spv")
-    set(HDR "${HEADERS_DIR}/postfx_${SHADER}_spv.h")
-    set(VAR "kpostfx_${SHADER}_spv")
+# Lista de shaders: fuente relativa a SHADERS_DIR
+set(SHADER_SOURCES
+    "postfx.vert"
+    "postfx.frag"
+    "upscale.frag"
+    "downscale.frag"
+    "crtpi_frag.glsl"
+)
+
+# Nombre de la variable C++ para cada shader (mismo orden)
+set(SHADER_VARS
+    "kpostfx_vert_spv"
+    "kpostfx_frag_spv"
+    "kupscale_frag_spv"
+    "kdownscale_frag_spv"
+    "kcrtpi_frag_spv"
+)
+
+# Flags extra de glslc para cada shader (vacío si no hay)
+set(SHADER_FLAGS
+    ""
+    ""
+    ""
+    ""
+    "-fshader-stage=frag"
+)
+
+list(LENGTH SHADER_SOURCES NUM_SHADERS)
+math(EXPR LAST_IDX "${NUM_SHADERS} - 1")
+
+foreach(IDX RANGE ${LAST_IDX})
+    list(GET SHADER_SOURCES ${IDX} SRC_NAME)
+    list(GET SHADER_VARS    ${IDX} VAR)
+    list(GET SHADER_FLAGS   ${IDX} EXTRA_FLAG)
+
+    # Derivar nombre del header desde la variable: kpostfx_vert_spv → postfx_vert_spv.h
+    string(REGEX REPLACE "^k" "" HDR_BASE "${VAR}")
+    set(SRC "${SHADERS_DIR}/${SRC_NAME}")
+    set(SPV "${HEADERS_DIR}/${HDR_BASE}.spv")
+    set(HDR "${HEADERS_DIR}/${HDR_BASE}.h")
 
     message(STATUS "Compilando ${SRC} ...")
-    execute_process(
-        COMMAND "${GLSLC}" "${SRC}" -o "${SPV}"
-        RESULT_VARIABLE GLSLC_RESULT
-        ERROR_VARIABLE  GLSLC_ERROR
-    )
+
+    if(EXTRA_FLAG)
+        execute_process(
+            COMMAND "${GLSLC}" "${EXTRA_FLAG}" "${SRC}" -o "${SPV}"
+            RESULT_VARIABLE GLSLC_RESULT
+            ERROR_VARIABLE  GLSLC_ERROR
+        )
+    else()
+        execute_process(
+            COMMAND "${GLSLC}" "${SRC}" -o "${SPV}"
+            RESULT_VARIABLE GLSLC_RESULT
+            ERROR_VARIABLE  GLSLC_ERROR
+        )
+    endif()
+
     if(NOT GLSLC_RESULT EQUAL 0)
         message(FATAL_ERROR "glslc falló para ${SRC}:\n${GLSLC_ERROR}")
     endif()