Hideously useless buffer perf optimization.

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

diff --git a/src/screen.cpp b/src/screen.cpp
index 5c3957c..ecc8c20 100644 (file)
--- a/src/screen.cpp
+++ b/src/screen.cpp
@@ -21,6 +21,8 @@ Screen::Screen()
 
        m_gl_context = SDL_GL_CreateContext(m_window);
 
+       m_debug_font_atlas = 0;
+
        ResizeViewport(800, 600);
 
        Clear();
@@ -130,6 +132,8 @@ void Screen::SetMouseCursor(Screen::MouseCursors cursor)
 
 void Screen::Present()
 {
+       if (m_debug_font_atlas)
+               DebugFontFlush();
        SDL_GL_SwapWindow(m_window);
 }
 
@@ -248,16 +252,23 @@ void Screen::DebugFontInit(const char *name, float font_size)
        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;
+
+       m_debug_font_vertices.SetUsage(GraphicsBuffer::BufferUsageStreamDraw);
+       m_debug_font_vertices.SetType(GraphicsBuffer::BufferTypeVertex);
+       m_debug_font_vertices.Upload(8192, nullptr);
+       m_debug_font_vertex_head = 0;
 }
 
 void Screen::DebugFontClear()
 {
        m_debug_font_x = m_debug_font_y = 0;
+       if (!m_debug_font_atlas) return;
        DebugFontPrint("\n");
 }
 
-void Screen::DebugFontPrint(const char* str)
+void Screen::DebugFontFlush()
 {
+       glBindFramebuffer(GL_FRAMEBUFFER, 0);
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
@@ -266,21 +277,67 @@ void Screen::DebugFontPrint(const char* str)
        glPushMatrix();
        glLoadIdentity();
        
+       glColor4f(0,0,0,1);
        
-       
+               
        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);
+
+       m_debug_font_vertices.Bind();
+       glEnableClientState(GL_VERTEX_ARRAY);
+       glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+       glVertexPointer(2, GL_FLOAT, 4*sizeof(float), (void*)(2*sizeof(float)));
+       glTexCoordPointer(2, GL_FLOAT, 4*sizeof(float), 0);
+       glDrawArrays(GL_QUADS, 0, m_debug_font_vertex_head/4);
+       glDisableClientState(GL_VERTEX_ARRAY);
+       glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+
+       glDisable(GL_BLEND);
+       glDisable(GL_TEXTURE_2D);
+       glPopMatrix();
+       glMatrixMode(GL_PROJECTION);
+       glPopMatrix();
+
+       m_debug_font_vertex_head = 0;
+}
+
+void Screen::DebugFontPrint(const char* str)
+{
+       if (!m_debug_font_atlas) return;
+
+       float *vertexData = (float*)m_debug_font_vertices.MapRange(m_debug_font_vertex_head*sizeof(float), m_debug_font_vertices.GetSize() - m_debug_font_vertex_head*sizeof(float), false, true, true);
        while (*str) {
+               if (m_debug_font_vertex_head*sizeof(float) + 16*sizeof(float) >= m_debug_font_vertices.GetSize() )
+               {
+                       m_debug_font_vertices.UnMap();
+                       DebugFontFlush();
+                       DebugFontPrint(str);
+                       return;
+               }
                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);
+                       *vertexData = q.s0; vertexData++;
+                       *vertexData = q.t0; vertexData++;
+                       *vertexData = q.x0; vertexData++;
+                       *vertexData = q.y0; vertexData++;
+                       *vertexData = q.s1; vertexData++;
+                       *vertexData = q.t0; vertexData++;
+                       *vertexData = q.x1; vertexData++;
+                       *vertexData = q.y0; vertexData++;
+                       *vertexData = q.s1; vertexData++;
+                       *vertexData = q.t1; vertexData++;
+                       *vertexData = q.x1; vertexData++;
+                       *vertexData = q.y1; vertexData++;
+                       *vertexData = q.s0; vertexData++;
+                       *vertexData = q.t1; vertexData++;
+                       *vertexData = q.x0; vertexData++;
+                       *vertexData = q.y1; vertexData++;
+
+                       m_debug_font_vertex_head += 16;
+
                }
                else if (*str == '\n')
                {
@@ -289,12 +346,8 @@ void Screen::DebugFontPrint(const char* str)
                }
                ++str;
        }
-       glEnd();
-       glDisable(GL_BLEND);
-       glDisable(GL_TEXTURE_2D);
-       glPopMatrix();
-       glMatrixMode(GL_PROJECTION);
-       glPopMatrix();
+       m_debug_font_vertices.UnMap();
+       //DebugFontFlush();
 }
 
 void Screen::DebugFontPrintF(const char *fmt, ...)