add support for texture that contains the contents of the previous frame

.gitignore

@@ -2,5 +2,6 @@ Bonzomatic
 .obj
 tmp
 build
+build.*
 .vs
 .DS_Store

cmake_all.bat

@@ -42,10 +42,10 @@ REM --------------------- BUILD TIME -------------------------------
 
 :build
 
-set BNZ_COMPILER=Visual Studio 10 2010
-if not "%BNZ_X64%"=="ON" goto skipme
-set BNZ_COMPILER=Visual Studio 10 2010 Win64
-:skipme
+set BNZ_COMPILER=Visual Studio 14 2015
+if not "%BNZ_X64%"=="ON" goto skipvs
+set BNZ_COMPILER=Visual Studio 14 2015 Win64
+:skipvs
 
 set BNZ_OUT_DIR=x86
 set BNZ_PLATFORM=W32

src/Renderer.h

@@ -56,6 +56,7 @@ namespace Renderer
     TEXTURETYPE type;
   };
 
+  Texture * CreateRGBA8Texture();
   Texture * CreateRGBA8TextureFromFile( const char * szFilename );
   Texture * CreateA8TextureFromData( int w, int h, const unsigned char * data );
   Texture * Create1DR32Texture( int w );
@@ -63,6 +64,9 @@ namespace Renderer
   void SetShaderTexture( const char * szTextureName, Texture * tex );
   void BindTexture( Texture * tex ); // temporary function until all the quad rendering is moved to the renderer
   void ReleaseTexture( Texture * tex );
+
+  void CopyBackbufferToTexture( Texture * tex );
+
   struct Vertex
   {
     Vertex( float _x, float _y, unsigned int _c = 0xFFFFFFFF, float _u = 0.0, float _v = 0.0) : 

src/main.cpp

@@ -304,6 +304,7 @@ int main(int argc, const char *argv[])
     return 0;
   }
 
+  Renderer::Texture * texPreviousFrame = Renderer::CreateRGBA8Texture();
   Renderer::Texture * texFFT = Renderer::Create1DR32Texture( FFT_SIZE );
   Renderer::Texture * texFFTSmoothed = Renderer::Create1DR32Texture( FFT_SIZE );
   Renderer::Texture * texFFTIntegrated = Renderer::Create1DR32Texture( FFT_SIZE );
@@ -390,6 +391,7 @@ int main(int argc, const char *argv[])
   bool bShowGui = true;
   Timer::Start();
   float fNextTick = 0.1f;
+  float fLastTimeMS = Timer::GetTime();
   while (!Renderer::WantsToQuit())
   {
     bool newShader = false;
@@ -481,6 +483,10 @@ int main(int argc, const char *argv[])
     Renderer::SetShaderConstant( "fGlobalTime", time );
     Renderer::SetShaderConstant( "v2Resolution", settings.sRenderer.nWidth, settings.sRenderer.nHeight );
 
+    float fTime = Timer::GetTime();
+    Renderer::SetShaderConstant( "fFrameTime", ( fTime - fLastTimeMS ) / 1000.0f );
+    fLastTimeMS = fTime;
+
     for (std::map<int,std::string>::iterator it = midiRoutes.begin(); it != midiRoutes.end(); it++)
     {
       Renderer::SetShaderConstant( it->second.c_str(), MIDI::GetCCValue( it->first ) );
@@ -510,6 +516,7 @@ int main(int argc, const char *argv[])
     Renderer::SetShaderTexture( "texFFT", texFFT );
     Renderer::SetShaderTexture( "texFFTSmoothed", texFFTSmoothed );
     Renderer::SetShaderTexture( "texFFTIntegrated", texFFTIntegrated );
+    Renderer::SetShaderTexture( "texPreviousFrame", texPreviousFrame );
 
     for (std::map<std::string, Renderer::Texture*>::iterator it = textures.begin(); it != textures.end(); it++)
     {
@@ -518,6 +525,8 @@ int main(int argc, const char *argv[])
 
     Renderer::RenderFullscreenQuad();
 
+    Renderer::CopyBackbufferToTexture( texPreviousFrame );
+
     Renderer::StartTextRendering();
 
     if (bShowGui)
@@ -591,6 +600,7 @@ int main(int argc, const char *argv[])
   MIDI::Close();
   FFT::Close();
 
+  Renderer::ReleaseTexture( texPreviousFrame );
   Renderer::ReleaseTexture( texFFT );
   Renderer::ReleaseTexture( texFFTSmoothed );
   for (std::map<std::string, Renderer::Texture*>::iterator it = textures.begin(); it != textures.end(); it++)

src/platform_glfw/Renderer.cpp

@@ -123,10 +123,12 @@ namespace Renderer
     "\n"
     "uniform float fGlobalTime; // in seconds\n"
     "uniform vec2 v2Resolution; // viewport resolution (in pixels)\n"
+    "uniform float fFrameTime; // duration of the last frame, in seconds\n"
     "\n"
     "uniform sampler1D texFFT; // towards 0.0 is bass / lower freq, towards 1.0 is higher / treble freq\n"
     "uniform sampler1D texFFTSmoothed; // this one has longer falloff and less harsh transients\n"
     "uniform sampler1D texFFTIntegrated; // this is continually increasing\n"
+    "uniform sampler2D texPreviousFrame; // screenshot of the previous frame\n"
     "{%textures:begin%}" // leave off \n here
     "uniform sampler2D {%textures:name%};\n"
     "{%textures:end%}" // leave off \n here
@@ -690,6 +692,32 @@ namespace Renderer
   };
 
   int textureUnit = 0;
+
+  Texture * CreateRGBA8Texture()
+  {
+    void * data = NULL;
+    GLenum internalFormat = GL_SRGB8_ALPHA8;
+    GLenum srcFormat = GL_FLOAT;
+    GLenum format = GL_UNSIGNED_BYTE;
+
+    GLuint glTexId = 0;
+    glGenTextures( 1, &glTexId );
+    glBindTexture( GL_TEXTURE_2D, glTexId );
+
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+
+    GLTexture * tex = new GLTexture();
+    tex->width = nWidth;
+    tex->height = nHeight;
+    tex->ID = glTexId;
+    tex->type = TEXTURETYPE_2D;
+    tex->unit = textureUnit++;
+    return tex;
+  }
+
   Texture * CreateRGBA8TextureFromFile( const char * szFilename )
   {
     int comp = 0;
@@ -815,6 +843,13 @@ namespace Renderer
     glDeleteTextures(1, &((GLTexture*)tex)->ID );
   }
 
+  void CopyBackbufferToTexture( Texture * tex )
+  {
+    glActiveTexture( GL_TEXTURE0 + ( (GLTexture *) tex )->unit );
+    glBindTexture( GL_TEXTURE_2D, ( (GLTexture *) tex )->ID );
+    glCopyTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, 0, 0, nWidth, nHeight, 0 );
+  }
+
   //////////////////////////////////////////////////////////////////////////
   // text rendering
 

src/platform_w32_dx11/Renderer.cpp

@@ -112,12 +112,14 @@ namespace Renderer
     "Texture1D texFFT; // towards 0.0 is bass / lower freq, towards 1.0 is higher / treble freq\n"
     "Texture1D texFFTSmoothed; // this one has longer falloff and less harsh transients\n"
     "Texture1D texFFTIntegrated; // this is continually increasing\n"
+    "Texture2D texPreviousFrame; // screenshot of the previous frame\n"
     "SamplerState smp;\n"
     "\n"
     "cbuffer constants\n"
     "{\n"
     "\tfloat fGlobalTime; // in seconds\n"
     "\tfloat2 v2Resolution; // viewport resolution (in pixels)\n"
+    "\tfloat fFrameTime; // duration of the last frame, in seconds\n"
     "{%midi:begin%}"
     "\tfloat {%midi:name%};\n"
     "{%midi:end%}"
@@ -912,6 +914,35 @@ namespace Renderer
   }
 
   int textureUnit = 0;
+
+  Renderer::Texture * CreateRGBA8Texture()
+  {
+    D3D11_TEXTURE2D_DESC desc;
+    ZeroMemory( &desc, sizeof( D3D11_TEXTURE2D_DESC ) );
+    desc.Width = nWidth;
+    desc.Height = nHeight;
+    desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    desc.MipLevels = 1;
+    desc.ArraySize = 1;
+    desc.SampleDesc.Count = 1;
+    desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
+
+    ID3D11Texture2D * pTex = NULL;
+
+    if ( pDevice->CreateTexture2D( &desc, NULL, &pTex ) != S_OK )
+      return NULL;
+
+    DX11Texture * tex = new DX11Texture();
+    tex->width = nWidth;
+    tex->height = nHeight;
+    tex->pTexture = pTex;
+    tex->type = TEXTURETYPE_2D;
+    tex->format = desc.Format;
+    CreateResourceView( tex );
+    return tex;
+
+  }
+
   Texture * CreateRGBA8TextureFromFile( const char * szFilename )
   {
     int comp = 0;
@@ -1057,6 +1088,13 @@ namespace Renderer
     delete tex;
   }
 
+  void CopyBackbufferToTexture( Texture * tex )
+  {
+    ID3D11Resource * pTex = ( (DX11Texture *) tex )->pTexture;
+
+    pContext->CopySubresourceRegion( pTex, 0, 0, 0, 0, pBackBuffer, 0, NULL );
+  }
+
   //////////////////////////////////////////////////////////////////////////
   // text rendering
 

src/platform_w32_dx9/Renderer.cpp

@@ -116,6 +116,8 @@ namespace Renderer
     "// this one has longer falloff and less harsh transients\n"
     "texture texFFTIntegratedT; sampler1D texFFTIntegrated = sampler_state { Texture = <texFFTIntegratedT>; }; \n"
     "// this is continually increasing\n"
+    "texture texPreviousFrameT; sampler2D texPreviousFrame = sampler_state { Texture = <texPreviousFrameT>; }; \n"
+    "// screenshot of the previous frame\n"
     "\n"
     "{%textures:begin%}" // leave off \n here
     "texture raw{%textures:name%}; sampler2D {%textures:name%} = sampler_state { Texture = <raw{%textures:name%}>; };\n"
@@ -125,6 +127,7 @@ namespace Renderer
     "float {%midi:name%};\n"
     "{%midi:end%}"
     "float fGlobalTime; // in seconds\n"
+    "float fFrameTime; // duration of the last frame, in seconds\n"
     "float2 v2Resolution; // viewport resolution (in pixels)\n"
     "\n"
     "float4 plas( float2 v, float time )\n"
@@ -480,11 +483,12 @@ namespace Renderer
       D3DDECL_END()
     };
 
-    static float pQuad[] = {
-      -1.0, -1.0,  0.0, 0.0, 0.0,
-      -1.0,  1.0,  0.0, 0.0, 1.0,
-       1.0, -1.0,  0.0, 1.0, 0.0,
-       1.0,  1.0,  0.0, 1.0, 1.0,
+    static float pQuad[] = 
+    {
+      -1.0, -1.0,  0.0, 0.0 + 0.5 / (float)nWidth, 0.0 + 0.5 / (float)nHeight,
+      -1.0,  1.0,  0.0, 0.0 + 0.5 / (float)nWidth, 1.0 + 0.5 / (float)nHeight,
+       1.0, -1.0,  0.0, 1.0 + 0.5 / (float)nWidth, 0.0 + 0.5 / (float)nHeight,
+       1.0,  1.0,  0.0, 1.0 + 0.5 / (float)nWidth, 1.0 + 0.5 / (float)nHeight,
     };
 
     pDevice->CreateVertexBuffer( 4 * 5 * sizeof(float), D3DUSAGE_WRITEONLY, D3DFVF_XYZ | D3DFVF_TEX1, D3DPOOL_DEFAULT, &pFullscreenQuadVB, NULL);
@@ -623,6 +627,24 @@ namespace Renderer
   };
 
   int textureUnit = 0;
+
+  Renderer::Texture * CreateRGBA8Texture()
+  {
+    LPDIRECT3DTEXTURE9 pTex = NULL;
+    pDevice->CreateTexture( nWidth, nHeight, 1, D3DUSAGE_RENDERTARGET, D3DFMT_X8R8G8B8, D3DPOOL_DEFAULT, &pTex, NULL );
+
+    if ( !pTex )
+      return NULL;
+
+    DX9Texture * tex = new DX9Texture();
+    tex->pTexture = pTex;
+    tex->width = nWidth;
+    tex->height = nHeight;
+    tex->type = TEXTURETYPE_2D;
+    return tex;
+
+  }
+
   Texture * CreateRGBA8TextureFromFile( const char * szFilename )
   {
     LPDIRECT3DTEXTURE9 pTex = NULL;
@@ -630,8 +652,8 @@ namespace Renderer
     HRESULT h = D3DXCreateTextureFromFileExA(
       pDevice,
       szFilename,
-      D3DX_DEFAULT,
-      D3DX_DEFAULT,
+      D3DX_DEFAULT_NONPOW2,
+      D3DX_DEFAULT_NONPOW2,
       0,
       NULL,
       D3DFMT_FROM_FILE,
@@ -734,10 +756,27 @@ namespace Renderer
     return tex;
   }
 
+  void ReleaseTexture( Texture * tex )
+  {
+    ( (DX9Texture *) tex )->pTexture->Release();
+    delete tex;
+  }
+
+  void CopyBackbufferToTexture( Texture * tex )
+  {
+    LPDIRECT3DTEXTURE9 pTex = ( (DX9Texture *) tex )->pTexture;
+    LPDIRECT3DSURFACE9 pSurf = NULL;
+    pTex->GetSurfaceLevel( 0, &pSurf );
+    if ( pSurf )
+    {
+      HRESULT res = pDevice->StretchRect( pBackBuffer, NULL, pSurf, NULL, D3DTEXF_LINEAR );
+      pSurf->Release();
+    }
+  }
+
   //////////////////////////////////////////////////////////////////////////
   // text rendering
 
-
   void StartTextRendering()
   {
     pDevice->SetVertexShader( NULL );
@@ -764,12 +803,6 @@ namespace Renderer
     pDevice->SetTextureStageState( 0, D3DTSS_ALPHAARG2, D3DTA_TEXTURE );
   }
 
-  void ReleaseTexture( Texture * tex )
-  {
-    ((DX9Texture *)tex)->pTexture->Release();
-    delete tex;
-  }
-
   int bufferPointer = 0;
   unsigned char buffer[GUIQUADVB_SIZE * sizeof(float) * 6];
   bool lastModeIsQuad = true;