Changeset 2155Tweet

Timestamp:

Dec 20, 2012, 2:01:28 AM (10 years ago)

Author:

sam

Message:

neercs: some fallback code when shader model 4 isn’t available.

Location:

trunk/tools/neercs/video

Files:

• text-render.cpp (modified) (7 diffs)
• text-render.h (modified) (1 diff)
• text.lolfx (modified) (4 diffs)

trunk/tools/neercs/video/text-render.cpp

@@ -24 +24 @@
 
 extern char const *lolfx_text;
+
+#define HAVE_SHADER_4 1
 
 /*
@@ -49 +51 @@
     m_char = m_shader->GetAttribLocation("in_Char",
                                          VertexUsage::Color, 1);
+#if !HAVE_SHADER_4
+    m_vertexid = m_shader->GetAttribLocation("in_VertexID",
+                                             VertexUsage::Position, 0);
+#endif
     m_texture = m_shader->GetUniformLocation("u_Texture");
     m_transform = m_shader->GetUniformLocation("u_Transform");
     m_datasize = m_shader->GetUniformLocation("u_DataSize");
     m_vdecl
+#if HAVE_SHADER_4
+      = new VertexDeclaration(VertexStream<uint32_t>(VertexUsage::Color),
+                              VertexStream<uint32_t>(VertexUsage::Color));
+#else
       = new VertexDeclaration(VertexStream<u8vec4>(VertexUsage::Color),
-                              VertexStream<u8vec4>(VertexUsage::Color));
+                              VertexStream<u8vec4>(VertexUsage::Color),
+                              VertexStream<float>(VertexUsage::Position));
+#endif
 
     CreateBuffers();
@@ -61 +73 @@
 void TextRender::CreateBuffers()
 {
-    m_vbo2 = new VertexBuffer(m_cells * sizeof(int32_t));
-    m_vbo3 = new VertexBuffer(m_cells * sizeof(u8vec4));
+#if HAVE_SHADER_4
+    m_vbo1 = new VertexBuffer(m_cells * sizeof(uint32_t));
+    m_vbo2 = new VertexBuffer(m_cells * sizeof(uint32_t));
+#else
+    m_vbo1 = new VertexBuffer(m_cells * sizeof(u8vec4));
+    m_vbo2 = new VertexBuffer(m_cells * sizeof(u8vec4));
+    m_vbo3 = new VertexBuffer(4 * m_cells * sizeof(float));
+
+    float *idx = (float *)m_vbo3->Lock(0, 0);
+    for (int i = 0; i < m_cells; i++)
+        idx[i] = (float)i;
+    m_vbo3->Unlock();
+#endif
 
     m_fbo = new FrameBuffer(m_fbo_size);
@@ -74 +97 @@
     if (current_size != m_canvas_size)
     {
+        delete m_vbo1;
         delete m_vbo2;
         delete m_vbo3;
@@ -96 +120 @@
 
     /* Upload libcaca canvas contents to the vertex buffers */
-    uint32_t *colors = (uint32_t *)m_vbo2->Lock(0, 0);
+    uint32_t *colors = (uint32_t *)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++)
@@ -109 +133 @@
     memcpy(colors, caca_get_canvas_attrs(m_caca),
            m_cells * sizeof(uint32_t));
-    m_vbo2->Unlock();
-
-    uint32_t *chars = (uint32_t *)m_vbo3->Lock(0, 0);
+    m_vbo1->Unlock();
+
+    uint32_t *chars = (uint32_t *)m_vbo2->Lock(0, 0);
     memcpy(chars, caca_get_canvas_chars(m_caca),
            m_cells * sizeof(uint32_t));
-    m_vbo3->Unlock();
+    m_vbo2->Unlock();
 
     m_fbo->Bind();
@@ -132 +156 @@
     m_shader->SetUniform(m_datasize, vec2(m_canvas_size.x,
                                           max(m_font_size.x, m_font_size.y)));
-    m_vdecl->SetStream(m_vbo2, m_color);
-    m_vdecl->SetStream(m_vbo3, m_char);
+    m_vdecl->SetStream(m_vbo1, m_color);
+    m_vdecl->SetStream(m_vbo2, m_char);
+#if !HAVE_SHADER_4
+    m_vdecl->SetStream(m_vbo3, m_vertexid);
+#endif
     m_vdecl->Bind();
     m_vdecl->DrawElements(MeshPrimitive::Points, 0, m_cells);

trunk/tools/neercs/video/text-render.h

@@ -23 +23 @@
 
     Shader *m_shader;
-    ShaderAttrib m_color, m_char;
+    ShaderAttrib m_color, m_char, m_vertexid;
     ShaderUniform m_texture, m_transform, m_datasize;
     VertexDeclaration *m_vdecl;
-    VertexBuffer *m_vbo2, *m_vbo3;
+    VertexBuffer *m_vbo1, *m_vbo2, *m_vbo3;
 
     FrameBuffer *m_fbo;

trunk/tools/neercs/video/text.lolfx

@@ -3 +3 @@
 #version 130
 
-#define HAVE_UINT 1
+#define HAVE_SHADER_4 1
 
-#if HAVE_UINT
+#if HAVE_SHADER_4
 in uint in_Char, in_Attr;
 #else
 in vec4 in_Char, in_Attr;
+in float in_VertexID;
 #endif
 
@@ -20 +21 @@
 void main()
 {
-#if HAVE_UINT
+#if HAVE_SHADER_4
     float u = float(in_Char & 0xfu) / 32.0 + 0.0;
     float v = float((in_Char >> 4u) & 0xfu) / 32.0 + 0.5;
@@ -31 +32 @@
     pass_UV = vec2(u, v);
 
-#if HAVE_UINT
+#if HAVE_SHADER_4
     float A = float(in_Attr >> 29u) / 7.0;
     float B = float((in_Attr >> 25u) & 0xfu) / 15.0;
@@ -63 +64 @@
     gl_PointSize = u_DataSize[1];
 
+#if HAVE_SHADER_4
     vec2 coord = vec2(gl_VertexID % int(u_DataSize[0]),
                       gl_VertexID / int(u_DataSize[0]));
+#else
+    vec2 coord = vec2(mod(in_VertexID, u_DataSize[0]),
+                      floor(in_VertexID / u_DataSize[0]));
+#endif
+
     gl_Position = u_Transform * vec4(coord, 0.0, 1.0);
 }