Hacky debug font system, performance counter.

[ipdf/code.git] / src / screen.cpp

diff --git a/src/screen.cpp b/src/screen.cpp
index 712bd26..09cd0b5 100644 (file)
--- a/src/screen.cpp
+++ b/src/screen.cpp
@@ -19,11 +19,11 @@ Screen::Screen()
 
        m_gl_context = SDL_GL_CreateContext(m_window);
 
-       glClearColor(1.f,1.f,1.f,1.f);
-       glClear(GL_COLOR_BUFFER_BIT);
+       ResizeViewport(800, 600);
+
+       Clear();
        Present();
        
-       ResizeViewport(800, 600);
 
 }
 
@@ -34,6 +34,13 @@ Screen::~Screen()
        SDL_Quit();
 }
 
+void Screen::Clear(float r, float g, float b, float a)
+{
+       glClearColor(r,g,b,a);
+       glClear(GL_COLOR_BUFFER_BIT);
+       DebugFontClear();
+}
+
 void Screen::ResizeViewport(int width, int height)
 {
        glViewport(0, 0, width, height);
@@ -132,10 +139,18 @@ void Screen::ScreenShot(const char * filename) const
        unsigned char * pixels = new unsigned char[w*h*4];
        if (pixels == NULL)
                Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
+       glReadBuffer(GL_FRONT);
+       glPixelStorei(GL_PACK_ALIGNMENT, 1);
+       for (int y = 0; y < h; ++y)
+       {
+               glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
+       }
 
-       glReadPixels(0,0,w, h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
-
-       SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0,0,0,0);
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+       SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
+#else
+       SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
+#endif
        if (surf == NULL)
                Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
 
@@ -208,3 +223,79 @@ void Screen::RenderBMP(const char * filename) const
        glDisable(GL_TEXTURE_2D);
        SDL_FreeSurface(bmp);   
 }
+
+void Screen::DebugFontInit(const char *name, float font_size)
+{
+       unsigned char font_atlas_data[1024*1024];
+       FILE *font_file = fopen(name, "rb");
+       fseek(font_file, 0, SEEK_END);
+       size_t font_file_size = ftell(font_file);
+       fseek(font_file, 0, SEEK_SET);
+       unsigned char *font_file_data = (unsigned char*)malloc(font_file_size);
+       fread(font_file_data, 1, font_file_size, font_file);
+       fclose(font_file);
+       stbtt_BakeFontBitmap(font_file_data,0, font_size, font_atlas_data,1024,1024, 32,96, m_debug_font_rects);
+       free(font_file_data);
+       glGenTextures(1, &m_debug_font_atlas);
+       glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
+       glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 1024,1024, 0, GL_ALPHA, GL_UNSIGNED_BYTE, font_atlas_data);
+       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+       m_debug_font_size = font_size;
+}
+
+void Screen::DebugFontClear()
+{
+       m_debug_font_x = m_debug_font_y = 0;
+       DebugFontPrint("\n");
+}
+
+void Screen::DebugFontPrint(const char* str)
+{
+       glMatrixMode(GL_PROJECTION);
+       glPushMatrix();
+       glLoadIdentity();
+       glOrtho(0,ViewportWidth(), ViewportHeight(), 0, -1, 1);
+       glMatrixMode(GL_MODELVIEW);
+       glPushMatrix();
+       glLoadIdentity();
+       
+       
+       
+       glEnable(GL_TEXTURE_2D);
+       glEnable(GL_BLEND);
+       glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+       glBindTexture(GL_TEXTURE_2D, m_debug_font_atlas);
+       glBegin(GL_QUADS);
+       while (*str) {
+               if (*str >= 32 && *str < 128) {
+                       stbtt_aligned_quad q;
+                       stbtt_GetBakedQuad(m_debug_font_rects, 1024,1024, *str-32, &m_debug_font_x,&m_debug_font_y,&q,1);
+                       glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0);
+                       glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0);
+                       glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1);
+                       glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1);
+               }
+               else if (*str == '\n')
+               {
+                       m_debug_font_x = 0;
+                       m_debug_font_y += m_debug_font_size;
+               }
+               ++str;
+       }
+       glEnd();
+       glDisable(GL_BLEND);
+       glDisable(GL_TEXTURE_2D);
+       glPopMatrix();
+       glMatrixMode(GL_MODELVIEW);
+       glPopMatrix();
+}
+
+void Screen::DebugFontPrintF(const char *fmt, ...)
+{
+       char buffer[BUFSIZ];
+       va_list va;
+       va_start(va, fmt);
+       vsnprintf(buffer, BUFSIZ, fmt,va);
+       va_end(va);
+       DebugFontPrint(buffer);
+}