examples: Add example of assigning a matrix to a model

examples/loading/assign_transform_matrix/Makefile

@@ -0,0 +1,6 @@
+# This is a minimal makefile only used for the examples. If you want a makefile
+# for your project, take one from the templates inside examples/templates.
+
+BINDIRS	:= data
+
+include ../../Makefile.example

examples/loading/assign_transform_matrix/Makefile.dkp

@@ -0,0 +1,220 @@
+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/ds_rules
+
+#---------------------------------------------------------------------------------
+# TARGET is the name of the output
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# INCLUDES is a list of directories containing extra header files
+# DATA is a list of directories containing binary files embedded using bin2o
+# GRAPHICS is a list of directories containing image files to be converted with grit
+# AUDIO is a list of directories containing audio to be converted by maxmod
+# ICON is the image used to create the game icon, leave blank to use default rule
+# NITRO is a directory that will be accessible via NitroFS
+#---------------------------------------------------------------------------------
+TARGET   := $(shell basename $(CURDIR))
+BUILD    := build
+SOURCES  := source
+INCLUDES := include
+DATA     :=
+GRAPHICS := graphics
+AUDIO    :=
+ICON     :=
+
+# specify a directory which contains the nitro filesystem
+# this is relative to the Makefile
+NITRO    :=
+
+# These set the information text in the nds file
+GAME_TITLE     := $(shell basename $(CURDIR))
+GAME_SUBTITLE1 := Nitro Engine example
+GAME_SUBTITLE2 := github.com/AntonioND/nitro-engine
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH := -marm -mthumb-interwork -march=armv5te -mtune=arm946e-s
+
+CFLAGS   := -g -Wall -O3\
+            $(ARCH) $(INCLUDE) -DARM9
+CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions
+ASFLAGS  := -g $(ARCH)
+LDFLAGS   = -specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+
+#---------------------------------------------------------------------------------
+# any extra libraries we wish to link with the project (order is important)
+#---------------------------------------------------------------------------------
+LIBS := -lNE -lfat -lnds9
+
+# automatigically add libraries for NitroFS
+ifneq ($(strip $(NITRO)),)
+LIBS := -lfilesystem -lfat $(LIBS)
+endif
+# automagically add maxmod library
+ifneq ($(strip $(AUDIO)),)
+LIBS := -lmm9 $(LIBS)
+endif
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS := $(LIBNDS) $(PORTLIBS) $(DEVKITPRO)/nitro-engine
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export OUTPUT := $(CURDIR)/$(TARGET)
+
+export VPATH := $(CURDIR)/$(subst /,,$(dir $(ICON)))\
+                $(foreach dir,$(SOURCES),$(CURDIR)/$(dir))\
+                $(foreach dir,$(DATA),$(CURDIR)/$(dir))\
+                $(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir))
+
+export DEPSDIR := $(CURDIR)/$(BUILD)
+
+CFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+PNGFILES := $(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.png)))
+BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+# prepare NitroFS directory
+ifneq ($(strip $(NITRO)),)
+  export NITRO_FILES := $(CURDIR)/$(NITRO)
+endif
+
+# get audio list for maxmod
+ifneq ($(strip $(AUDIO)),)
+  export MODFILES	:=	$(foreach dir,$(notdir $(wildcard $(AUDIO)/*.*)),$(CURDIR)/$(AUDIO)/$(dir))
+
+  # place the soundbank file in NitroFS if using it
+  ifneq ($(strip $(NITRO)),)
+    export SOUNDBANK := $(NITRO_FILES)/soundbank.bin
+
+  # otherwise, needs to be loaded from memory
+  else
+    export SOUNDBANK := soundbank.bin
+    BINFILES += $(SOUNDBANK)
+  endif
+endif
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+  export LD := $(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+  export LD := $(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_BIN   :=	$(addsuffix .o,$(BINFILES))
+
+export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export OFILES := $(PNGFILES:.png=.o) $(OFILES_BIN) $(OFILES_SOURCES)
+
+export HFILES := $(PNGFILES:.png=.h) $(addsuffix .h,$(subst .,_,$(BINFILES)))
+
+export INCLUDE  := $(foreach dir,$(INCLUDES),-iquote $(CURDIR)/$(dir))\
+                   $(foreach dir,$(LIBDIRS),-I$(dir)/include)\
+                   -I$(CURDIR)/$(BUILD)
+export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+ifeq ($(strip $(ICON)),)
+  icons := $(wildcard *.bmp)
+
+  ifneq (,$(findstring $(TARGET).bmp,$(icons)))
+    export GAME_ICON := $(CURDIR)/$(TARGET).bmp
+  else
+    ifneq (,$(findstring icon.bmp,$(icons)))
+      export GAME_ICON := $(CURDIR)/icon.bmp
+    endif
+  endif
+else
+  ifeq ($(suffix $(ICON)), .grf)
+    export GAME_ICON := $(CURDIR)/$(ICON)
+  else
+    export GAME_ICON := $(CURDIR)/$(BUILD)/$(notdir $(basename $(ICON))).grf
+  endif
+endif
+
+.PHONY: $(BUILD) clean
+
+#---------------------------------------------------------------------------------
+$(BUILD):
+	@mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile.dkp
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).elf $(TARGET).nds $(SOUNDBANK)
+
+#---------------------------------------------------------------------------------
+else
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+$(OUTPUT).nds: $(OUTPUT).elf $(GAME_ICON)
+$(OUTPUT).elf: $(OFILES)
+
+# source files depend on generated headers
+$(OFILES_SOURCES) : $(HFILES)
+
+# need to build soundbank first
+$(OFILES): $(SOUNDBANK)
+
+#---------------------------------------------------------------------------------
+# rule to build solution from music files
+#---------------------------------------------------------------------------------
+$(SOUNDBANK) : $(MODFILES)
+#---------------------------------------------------------------------------------
+	mmutil $^ -d -o$@ -hsoundbank.h
+
+#---------------------------------------------------------------------------------
+%.bin.o %_bin.h : %.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+#---------------------------------------------------------------------------------
+# This rule creates assembly source files using grit
+# grit takes an image file and a .grit describing how the file is to be processed
+# add additional rules like this for each image extension
+# you use in the graphics folders
+#---------------------------------------------------------------------------------
+%.s %.h: %.png %.grit
+#---------------------------------------------------------------------------------
+	grit $< -fts -o$*
+
+#---------------------------------------------------------------------------------
+# Convert non-GRF game icon to GRF if needed
+#---------------------------------------------------------------------------------
+$(GAME_ICON): $(notdir $(ICON))
+#---------------------------------------------------------------------------------
+	@echo convert $(notdir $<)
+	@grit $< -g -gt -gB4 -gT FF00FF -m! -p -pe 16 -fh! -ftr
+
+-include $(DEPSDIR)/*.d
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------

examples/loading/assign_transform_matrix/assets.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+NITRO_ENGINE=../../..
+ASSETS=$NITRO_ENGINE/examples/assets
+TOOLS=$NITRO_ENGINE/tools
+OBJ2DL=$TOOLS/obj2dl/obj2dl.py
+
+mkdir -p data
+
+python3 $OBJ2DL \
+    --input $ASSETS/sphere.obj \
+    --output data/sphere.bin \
+    --texture 32 32

examples/loading/assign_transform_matrix/source/main.c

@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: CC0-1.0
+//
+// SPDX-FileContributor: Antonio Niño Díaz, 2008-2024
+//
+// This file is part of Nitro Engine
+
+//  TODO
+
+#include <NEMain.h>
+
+#include "sphere_bin.h"
+
+typedef struct {
+    NE_Camera *Camera;
+    NE_Model *ModelWithoutMatrix;
+    NE_Model *ModelWithMatrix;
+} SceneData;
+
+void Draw3DScene(void *arg)
+{
+    SceneData *Scene = arg;
+
+    NE_CameraUse(Scene->Camera);
+
+    NE_ModelDraw(Scene->ModelWithoutMatrix);
+    NE_ModelDraw(Scene->ModelWithMatrix);
+}
+
+int main(int argc, char *argv[])
+{
+    SceneData Scene = { 0 };
+
+    irqEnable(IRQ_HBLANK);
+    irqSet(IRQ_VBLANK, NE_VBLFunc);
+    irqSet(IRQ_HBLANK, NE_HBLFunc);
+
+    // Init Nitro Engine.
+    NE_Init3D();
+    // libnds uses VRAM_C for the text console, reserve A and B only
+    NE_TextureSystemReset(0, 0, NE_VRAM_AB);
+    // Init console in non-3D screen
+    consoleDemoInit();
+
+    // Allocate space for everything.
+    Scene.ModelWithoutMatrix = NE_ModelCreate(NE_Static);
+    Scene.ModelWithMatrix = NE_ModelCreate(NE_Static);
+
+    Scene.Camera = NE_CameraCreate();
+
+    // Setup camera
+    NE_CameraSet(Scene.Camera,
+                 0, 0, 3,
+                 0, 0, 0,
+                 0, 1, 0);
+
+    // Load models
+    NE_ModelLoadStaticMesh(Scene.ModelWithoutMatrix, sphere_bin);
+    NE_ModelLoadStaticMesh(Scene.ModelWithMatrix, sphere_bin);
+
+    // Set up light
+    NE_LightSet(0, NE_Yellow, 0, -0.5, -0.5);
+
+    // Set start coordinates/rotation of the models
+    NE_ModelSetCoord(Scene.ModelWithoutMatrix, -1, 0, 0);
+
+    // Transformation matrix we are going to use for a model. Note that this
+    // matrix is transposed compared to what most 3D documentation describes.
+    m4x3 matrix = {{
+        // 3x3 transformation
+        inttof32(1), 0,                     0,
+        0,           inttof32(1),           0,
+        0,                     0, inttof32(1),
+        // Translation vector
+        inttof32(2),           0,           0
+    }};
+
+    int translation = inttof32(2);
+
+    printf("The right ball uses a matrix\n"
+           "assigned by the user, the left\n"
+           "one has rotation managed by\n"
+           "Nitro Engine.");
+
+    while (1)
+    {
+        NE_WaitForVBL(0);
+
+        // Rotate the first model
+        NE_ModelRotate(Scene.ModelWithoutMatrix, -1, 2, 1);
+
+        // Update matrix manually
+        translation += floattof32(0.05);
+        if (translation > inttof32(3))
+            translation = inttof32(1);
+        matrix.m[9] = translation;
+
+        // Assign matrix again
+        NE_ModelSetMatrix(Scene.ModelWithMatrix, &matrix);
+
+        // Draw scene
+        NE_ProcessArg(Draw3DScene, &Scene);
+    }
+
+    return 0;
+}