From 24a2117c176db961a047313860e95a8882f0abe0 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Wed, 11 Jul 2012 18:29:22 +0000
Subject: [PATCH] neercs: handle caca canvas size changes automatically.

---
 neercs/video/text-render.cpp | 33 +++++++++++++++++++++++++++------
 neercs/video/text-render.h   |  3 ++-
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/neercs/video/text-render.cpp b/neercs/video/text-render.cpp
index 40442b2..7eb6b80 100644
--- a/neercs/video/text-render.cpp
+++ b/neercs/video/text-render.cpp
@@ -36,9 +36,6 @@ TextRender::TextRender(caca_canvas_t *caca, ivec2 font_size)
     m_fbo_size(m_font_size * m_canvas_size),
     m_cells(m_canvas_size.x * m_canvas_size.y)
 {
-    for (int j = 0; j < m_canvas_size.y; j++)
-    for (int i = 0; i < m_canvas_size.x; i++)
-        m_vertices << vec2(i, j);
 }
 
 void TextRender::Init()
@@ -60,9 +57,16 @@ void TextRender::Init()
                               VertexStream<uint32_t>(VertexUsage::Color),
                               VertexStream<uint32_t>(VertexUsage::Color));
 
-    m_vbo1 = new VertexBuffer(m_vertices.Bytes());
-    void *vertices = m_vbo1->Lock(0, 0);
-    memcpy(vertices, &m_vertices[0], m_vertices.Bytes());
+    CreateBuffers();
+}
+
+void TextRender::CreateBuffers()
+{
+    m_vbo1 = new VertexBuffer(m_cells * sizeof(vec2));
+    vec2 *vertices = (vec2 *)m_vbo1->Lock(0, 0);
+    for (int j = 0; j < m_canvas_size.y; j++)
+    for (int i = 0; i < m_canvas_size.x; i++)
+        vertices[j * m_canvas_size.x + i] = vec2(i, j);
     m_vbo1->Unlock();
 
     m_vbo2 = new VertexBuffer(m_cells * sizeof(int32_t));
@@ -73,6 +77,23 @@ void TextRender::Init()
 
 void TextRender::Render()
 {
+    /* Handle canvas size changes */
+    ivec2 current_size(caca_get_canvas_width(m_caca),
+                       caca_get_canvas_height(m_caca));
+    if (current_size != m_canvas_size)
+    {
+        delete m_vbo1;
+        delete m_vbo2;
+        delete m_vbo3;
+        delete m_fbo;
+
+        m_canvas_size = current_size;
+        m_fbo_size = m_font_size * m_canvas_size;
+        m_cells = m_canvas_size.x * m_canvas_size.y;
+
+        CreateBuffers();
+    }
+
     /* Transform matrix for the scene:
      *  - translate to the centre of the glyph
      *  - scale by 2.f * font_size / fbo_size
diff --git a/neercs/video/text-render.h b/neercs/video/text-render.h
index 2b2bdd2..101af5e 100644
--- a/neercs/video/text-render.h
+++ b/neercs/video/text-render.h
@@ -13,11 +13,12 @@ struct TextRender
     void Blit(ivec2 pos, ivec2 size);
 
 private:
+    void CreateBuffers();
+
     caca_canvas_t *m_caca;
     ivec2 m_font_size, m_canvas_size, m_fbo_size;
     int m_cells;
 
-    Array<vec2> m_vertices;
     TileSet *m_font;
     Shader *m_shader;
     ShaderAttrib m_coord, m_color, m_char;