graphics/gpu/lenny/source/main.c

#include <3ds.h>
#include <citro3d.h>
#include <string.h>
#include "vshader_shbin.h"
#include "lenny.h"
 
#define CLEAR_COLOR 0x68B0D8FF
 
#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))
 
static DVLB_s* vshader_dvlb;
static shaderProgram_s program;
static int uLoc_projection, uLoc_modelView;
static C3D_Mtx projection;
 
static C3D_LightEnv lightEnv;
static C3D_Light light;
static C3D_LightLut lut_Spec;
 
static void* vbo_data;
static float angleX = 0.0, angleY = 0.0;
 
static void sceneInit(void)
{
 // Load the vertex shader, create a shader program and bind it
 vshader_dvlb = DVLB_ParseFile((u32*)vshader_shbin, vshader_shbin_size);
 shaderProgramInit(&program);
 shaderProgramSetVsh(&program, &vshader_dvlb->DVLE[0]);
 C3D_BindProgram(&program);
 
 // Get the location of the uniforms
 uLoc_projection = shaderInstanceGetUniformLocation(program.vertexShader, "projection");
 uLoc_modelView = shaderInstanceGetUniformLocation(program.vertexShader, "modelView");
 
 // Configure attributes for use with the 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=normal
 
 // Create the VBO (vertex buffer object)
 vbo_data = linearAlloc(sizeof(vertex_list));
 memcpy(vbo_data, vertex_list, sizeof(vertex_list));
 
 // Configure buffers
 C3D_BufInfo* bufInfo = C3D_GetBufInfo();
 BufInfo_Init(bufInfo);
 BufInfo_Add(bufInfo, vbo_data, sizeof(vertex), 2, 0x10);
 
 // Configure the first fragment shading substage to blend the fragment primary color
 // with the fragment secondary color.
 // See https://www.opengl.org/sdk/docs/man2/xhtml/glTexEnv.xml for more insight
 C3D_TexEnv* env = C3D_GetTexEnv(0);
 C3D_TexEnvInit(env);
 C3D_TexEnvSrc(env, C3D_Both, GPU_FRAGMENT_PRIMARY_COLOR, GPU_FRAGMENT_SECONDARY_COLOR, 0);
 C3D_TexEnvFunc(env, C3D_Both, GPU_ADD);
 
 static const C3D_Material material =
 {
 { 0.1f, 0.1f, 0.1f }, //ambient
 { 0.4f, 0.4f, 0.4f }, //diffuse
 { 0.5f, 0.5f, 0.5f }, //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_Spec, 20.0f);
 C3D_LightEnvLut(&lightEnv, GPU_LUT_D0, GPU_LUTINPUT_NH, false, &lut_Spec);
 
 C3D_LightInit(&light, &lightEnv);
}
 
static void sceneRender(float iod)
{
 // Compute the projection matrix
 Mtx_PerspStereoTilt(&projection, C3D_AngleFromDegrees(40.0f), C3D_AspectRatioTop, 0.01f, 1000.0f, iod, 2.0f, false);
 
 C3D_FVec objPos = FVec4_New(0.0f, 0.0f, -3.0f, 1.0f);
 C3D_FVec lightPos = FVec4_New(0.0f, 0.0f, -0.5f, 1.0f);
 
 // Calculate the modelView matrix
 C3D_Mtx modelView;
 Mtx_Identity(&modelView);
 Mtx_Translate(&modelView, objPos.x, objPos.y, objPos.z, true);
 Mtx_RotateY(&modelView, C3D_Angle(angleY), true);
 Mtx_Scale(&modelView, 2.0f, 2.0f, 2.0f);
 
 C3D_LightPosition(&light, &lightPos);
 
 // Update the uniforms
 C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, uLoc_projection, &projection);
 C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, uLoc_modelView, &modelView);
 
 // Draw the VBO
 C3D_DrawArrays(GPU_TRIANGLES, 0, vertex_list_count);
}
 
static void sceneExit(void)
{
 // Free the VBO
 linearFree(vbo_data);
 
 // Free the shader program
 shaderProgramFree(&program);
 DVLB_Free(vshader_dvlb);
}
 
int main()
{
 // Initialize graphics
 gfxInitDefault();
 gfxSet3D(true); // Enable stereoscopic 3D
 consoleInit(GFX_BOTTOM, NULL);
 C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
 
 // Initialize the render targets
 C3D_RenderTarget* targetLeft = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
 C3D_RenderTarget* targetRight = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
 C3D_RenderTargetSetOutput(targetLeft, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
 C3D_RenderTargetSetOutput(targetRight, GFX_TOP, GFX_RIGHT, DISPLAY_TRANSFER_FLAGS);
 
 // Initialize the scene
 sceneInit();
 
 // Main loop
 while (aptMainLoop())
 {
 hidScanInput();
 
 // Respond to user input
 u32 kDown = hidKeysDown();
 u32 kHeld = hidKeysHeld();
 if (kDown & KEY_START)
 break; // break in order to return to hbmenu
 
 float slider = osGet3DSliderState();
 float iod = slider/3;
 
 // Rotate the model
 if (!(kHeld & KEY_A))
 {
 angleX += 1.0f/64;
 angleY += 1.0f/256;
 }
 
 // Render the scene
 C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
 {
 C3D_RenderTargetClear(targetLeft, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
 C3D_FrameDrawOn(targetLeft);
 sceneRender(-iod);
 
 if (iod > 0.0f)
 {
 C3D_RenderTargetClear(targetRight, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
 C3D_FrameDrawOn(targetRight);
 sceneRender(iod);
 }
 }
 C3D_FrameEnd(0);
 }
 
 // Deinitialize the scene
 sceneExit();
 
 // Deinitialize graphics
 C3D_Fini();
 gfxExit();
 return 0;
}