+ m_frame_begin_time = SDL_GetPerformanceCounter();
+ if (m_last_frame_gpu_timer)
+ glDeleteQueries(1, &m_last_frame_gpu_timer);
+ m_last_frame_gpu_timer = m_frame_gpu_timer;
+ glGenQueries(1, &m_frame_gpu_timer);
+ glBeginQuery(GL_TIME_ELAPSED, m_frame_gpu_timer);
+}
+
+double Screen::GetLastFrameTimeGPU() const
+{
+ if (!m_last_frame_gpu_timer)
+ return 0;
+ uint64_t frame_time_ns;
+ glGetQueryObjectui64v(m_last_frame_gpu_timer, GL_QUERY_RESULT, &frame_time_ns);
+ return frame_time_ns/1000000000.0;
+}
+
+void Screen::RenderPixels(int x, int y, int w, int h, uint8_t *pixels) const
+{
+ GLenum texture_format = GL_RGBA;
+
+ m_texture_prog.Use();
+ GraphicsBuffer quad_vertex_buffer;
+ quad_vertex_buffer.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
+ quad_vertex_buffer.SetType(GraphicsBuffer::BufferTypeVertex);
+ //rectangular texture == 2 triangles
+ GLfloat quad[] = {
+ 0, 0, (float)x, (float)y,
+ 1, 0, (float)(x+w), (float)y,
+ 0, 1, (float)x, (float)(y+h),
+ 1, 1, (float)(x+w), (float)(y+h)
+ };
+ quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
+ quad_vertex_buffer.Bind();
+ m_viewport_ubo.Bind();
+
+ glUniform4f(m_colour_uniform_location, 1.0f, 1.0f, 1.0f, 1.0f);
+
+ GLuint texID;
+ glGenTextures(1, &texID);
+ glBindTexture(GL_TEXTURE_2D, texID);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, texture_format, GL_UNSIGNED_BYTE, pixels);
+
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
+ glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+ glDisableVertexAttribArray(1);
+ glDisableVertexAttribArray(0);
+
+}
+
+void Screen::ScreenShot(const char * filename) const
+{
+ Debug("Attempting to save BMP to file %s", filename);
+
+ int w = ViewportWidth();
+ int h = ViewportHeight();
+ 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);
+
+ for (int y = 0; y < h; ++y)
+ {
+ glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
+ }
+
+#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());
+
+ GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
+ Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", surf->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
+
+ if (SDL_SaveBMP(surf, filename) != 0)
+ Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
+
+ SDL_FreeSurface(surf);
+ delete [] pixels;
+ Debug("Succeeded!");
+}
+
+/**
+ * Render a BMP
+ * NOT PART OF THE DOCUMENT FORMAT
+ */
+void Screen::RenderBMP(const char * filename) const
+{
+ if (access(filename, R_OK) == -1)
+ {
+ Error("No such file \"%s\" - Nothing to render - You might have done this deliberately?", filename);
+ return;
+ }
+ SDL_Surface * bmp = SDL_LoadBMP(filename);
+ if (bmp == NULL)
+ Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
+
+ int w = bmp->w;
+ int h = bmp->h;
+
+ GLenum texture_format = GL_RGBA;
+ switch (bmp->format->BytesPerPixel)
+ {
+ case 4: //contains alpha
+ texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
+ break;
+ case 3: //does not contain alpha
+ texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
+ break;
+ default:
+ Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
+ break;
+ }
+
+ //Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", bmp->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
+
+ m_texture_prog.Use();
+ GraphicsBuffer quad_vertex_buffer;
+ quad_vertex_buffer.SetUsage(GraphicsBuffer::BufferUsageStaticDraw);
+ quad_vertex_buffer.SetType(GraphicsBuffer::BufferTypeVertex);
+ GLfloat quad[] = {
+ 0, 0, 0, 0,
+ 1, 0, (float)ViewportWidth(), 0,
+ 1, 1, (float)ViewportWidth(), (float)ViewportHeight(),
+ 0, 1, 0, (float)ViewportHeight()
+ };
+ quad_vertex_buffer.Upload(sizeof(GLfloat) * 16, quad);
+ quad_vertex_buffer.Bind();
+ m_viewport_ubo.Bind();
+
+ glUniform4f(m_colour_uniform_location, 1.0f, 1.0f, 1.0f, 1.0f);
+
+ GLuint texID;
+ glGenTextures(1, &texID);
+ glBindTexture(GL_TEXTURE_2D, texID);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+ glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
+
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (void*)(2*sizeof(float)));
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
+ glDisableVertexAttribArray(1);
+ glDisableVertexAttribArray(0);
+ glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+
+ SDL_FreeSurface(bmp);