Programmer sur Nintendo 3DS

#include <string.h>
#include <stdio.h>

#include <3ds.h>

int main(int argc, char **argv) {

    gfxInitDefault();
    consoleInit(GFX_TOP, NULL);

    printf("Hello 3DS World!");


    // Main loop
    while (aptMainLoop()) {

        gspWaitForVBlank();
        hidScanInput();

        // Your code goes here

        u32 kDown = hidKeysDown();
        if (kDown & KEY_START)
            break; // break in order to return to hbmenu

        // Flush and swap framebuffers
        gfxFlushBuffers();
        gfxSwapBuffers();
    }

    gfxExit();
    return 0;
}

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <3ds.h>
#include <citro3d.h>
#include "vshader_shbin.h"

#define CLEAR_COLOR 0x58D14AFF
#define CLEAR_COLOR2 0xFF9898FF

#define DISPLAY_TRANSFER_FLAGS \
    (GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(0) | GX_TRANSFER_RAW_COPY(0) | \
    GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGB8) | \
    GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))

typedef struct { float x, y, z; } vertex;

// Liste des sommets (position et couleur)
static const vertex vertex_list[] =
{
    // Avant
    { 0.5f, 0.5f, 0.5f }, { 1.0f, 0.0f, 0.0f },
    { -0.5f, 0.5f, 0.5f }, { 0.0f, 0.0f, 1.0f },
    { -0.5f, -0.5f, 0.5f }, { 0.0f, 1.0f, 0.0f },
    { 0.5f, -0.5f, 0.5f }, { 0.0f, 1.0f, 1.0f },
    // Arrière
    { 0.5f, 0.5f, -0.5f }, { 0.0f, 1.0f, 1.0f }, 
    { -0.5f, 0.5f, -0.5f }, { 1.0f, 1.0f, 0.0f }, 
    { -0.5f, -0.5f, -0.5f }, { 1.0f, 0.0f, 1.0f },
    { 0.5f, -0.5f, -0.5f }, { 0.0f, 0.0f, 0.0f },
};
#define vertex_list_count (sizeof(vertex_list)/sizeof(vertex_list[0]))

// Index des sommets pour l’affichage
static const u16 index_list[] =
{
    0, 2, 1,
    0, 3, 2,

    0, 4, 3,
    4, 7, 3,

    4, 5, 6,
    4, 6, 7,

    6, 2, 3,
    6, 3, 7,

    1, 6, 5,
    1, 2, 6,

    0, 1, 5,
    0, 5, 4
};
#define index_list_count (sizeof(index_list)/sizeof(index_list[0]))

static DVLB_s* vshader_dvlb;
static shaderProgram_s program;
static int uLoc_mvp; // Variable uniforme pour la matrice MVP
// Matrices
static C3D_Mtx projectionTop;
static C3D_Mtx projectionBot;
static C3D_Mtx view;
static C3D_Mtx model;
static C3D_Mtx mvp;

static void* vbo_data;
static void* index_data;

void updateMatrix(bool isTop)
{
    Mtx_Identity(&mvp);
    Mtx_Multiply(&mvp, &model, &mvp);
    Mtx_Multiply(&mvp, &view, &mvp);

    if(isTop)
    {
        Mtx_Multiply(&mvp, &projectionTop, &mvp);
    }
    else
    {
        Mtx_Multiply(&mvp, &projectionBot, &mvp);
    }
}

void initScene()
{
    // Charge le vertex shader et crée le program shader puis le lie
    vshader_dvlb = DVLB_ParseFile((u32*)vshader_shbin, vshader_shbin_size);
    shaderProgramInit(&program);
    shaderProgramSetVsh(&program, &vshader_dvlb->DVLE[0]);
    C3D_BindProgram(&program);

    // Récupère l’emplacement de la variable uniforme
    uLoc_mvp = shaderInstanceGetUniformLocation(program.vertexShader, "mvp");

    // Configure les attributs de sommets du vertex shader
    C3D_AttrInfo* attrInfo = C3D_GetAttrInfo();
    AttrInfo_Init(attrInfo);
    AttrInfo_AddLoader(attrInfo, 0, GPU_FLOAT, 3); // v0=position
    AttrInfo_AddLoader(attrInfo, 1, GPU_FLOAT, 3); // v1=color

    // Calcul des matrices de projection et de vue
    Mtx_OrthoTilt(&projectionTop, -2.0, 2.0, -1.0, 1.0, 0.0, 10.0, true);
    Mtx_OrthoTilt(&projectionBot, -2.0f, 2.0f, -3.1f, -1.1f, 0.0f, 10.0f, true);
    Mtx_LookAt(&view, FVec3_New(0, 0, -5), FVec3_New(0, 0, 0), FVec3_New(0, 1, 0), true);

    Mtx_Identity(&model);

    // Créer le VBO
    vbo_data = linearAlloc(sizeof(vertex_list)*2);
    memcpy(vbo_data, vertex_list, sizeof(vertex_list));

    // et l’IBO
    index_data = linearAlloc(sizeof(index_list));
    memcpy(index_data, index_list, sizeof(index_list));

    // Configure les tampons
    C3D_BufInfo* bufInfo = C3D_GetBufInfo();
    BufInfo_Init(bufInfo);
    BufInfo_Add(bufInfo, vbo_data, sizeof(vertex)*2, 2, 0x10);

    // Configure la première passe de la rasterization
    // https://www.opengl.org/sdk/docs/man2/xhtml/glTexEnv.xml
    C3D_TexEnv* env = C3D_GetTexEnv(0);
    C3D_TexEnvSrc(env, C3D_Both, GPU_PRIMARY_COLOR, 0, 0);
    C3D_TexEnvOp(env, C3D_Both, 0, 0, 0);
    C3D_TexEnvFunc(env, C3D_Both, GPU_REPLACE);
}

void exitScene()
{
    // Libère les VBO
    linearFree(index_data);
    linearFree(vbo_data);

    // Libère le program shader
    shaderProgramFree(&program);
    DVLB_Free(vshader_dvlb);
}

static void sceneRender(bool isTop)
{
    updateMatrix(isTop);

    // Mise à jour de la variable uniforme
    C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, uLoc_mvp, &mvp);

    // Affichage
    C3D_DrawElements(GPU_TRIANGLES, index_list_count, C3D_UNSIGNED_SHORT, index_data);
}

void sceneUpdate(float angle)
{
    Mtx_Identity(&model);

    Mtx_RotateX(&model, C3D_AngleFromDegrees(angle), false);
    Mtx_RotateY(&model, C3D_AngleFromDegrees(angle/3.f), false);
    Mtx_Translate(&model, 0, cosf(angle / 100.f) * 1.2f - 1, 0, false);
}

int main(int argc, char **argv) {

    const float speed = 2;
    float angle = 0;

    gfxInitDefault();
    C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);

    // Initialisations des cibles de rendu
    C3D_RenderTarget* top_target = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
    C3D_RenderTargetSetClear(top_target, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
    C3D_RenderTargetSetOutput(top_target, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);

    C3D_RenderTarget* bot_target = C3D_RenderTargetCreate(240, 320, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
    C3D_RenderTargetSetClear(bot_target, C3D_CLEAR_ALL, CLEAR_COLOR2, 0);
    C3D_RenderTargetSetOutput(bot_target, GFX_BOTTOM, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);

    initScene();

    // Boucle principale
    while (aptMainLoop()) {
        angle += speed;

        hidScanInput();
        u32 kDown = hidKeysDown();
        if (kDown & KEY_START)
            break; // fin de la boucle pour retourner au menu HomeBrew

        sceneUpdate(angle);

        // Affichage de la scène
        C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
            C3D_FrameDrawOn(top_target);
            sceneRender(true);
            C3D_FrameDrawOn(bot_target);
            sceneRender(false);
        C3D_FrameEnd(0);
    }

    exitScene();

    C3D_Fini();
    gfxExit();
    return 0;
}

; Example PICA200 vertex shader

; Variables uniformes
.fvec mvp[4]

; Constantes
.constf myconst(0.0, 1.0, -1.0, 0.1)
.constf myconst2(0.3, 0.0, 0.0, 0.0)
.alias  zeros myconst.xxxx ; Vector full of zeros
.alias  ones  myconst.yyyy ; Vector full of ones

; Sorties
.out outpos position
.out outclr color

; Entrées (alias pour aider la lecture)
.alias inpos v0
.alias inclr v1

.bool test

.proc main
    ; Force the w component of inpos to be 1.0
    mov r0.xyz, inpos
    mov r0.w,   ones

    ; outpos = projectionMatrix * inpos
    dp4 outpos.x, mvp[0], r0
    dp4 outpos.y, mvp[1], r0
    dp4 outpos.z, mvp[2], r0
    dp4 outpos.w, mvp[3], r0

    ; outclr = inclr
    mov r1.xyz, inclr
    mov r1.w,   ones
    mov outclr, r1

    ; Nous avons fini
    end
.end

static const C3D_Material material =
{
    { 0.2f, 0.2f, 0.2f }, //ambient
    { 0.4f, 0.4f, 0.4f }, //diffuse
    { 0.8f, 0.8f, 0.8f }, //specular0
    { 0.0f, 0.0f, 0.0f }, //specular1
    { 0.0f, 0.0f, 0.0f }, //emission
};

C3D_LightEnvInit(&lightEnv);
C3D_LightEnvBind(&lightEnv);
C3D_LightEnvMaterial(&lightEnv, &material);

LightLut_Phong(&lut_Phong, 30);
C3D_LightEnvLut(&lightEnv, GPU_LUT_D0, GPU_LUTINPUT_LN, false, &lut_Phong);

C3D_FVec lightVec = FVec4_New(0.0f, 0.0f, -0.5f, 1.0f);

C3D_LightInit(&light, &lightEnv);
C3D_LightColor(&light, 1.0, 1.0, 1.0);
C3D_LightPosition(&light, &lightVec);