source/backends/opengl/texture1d_backend.cpp

   1 #include <msp/gl/extensions/arb_direct_state_access.h>
   2 #include <msp/gl/extensions/arb_texture_storage.h>
   3 #include <msp/gl/extensions/msp_texture1d.h>
   4 #include "gl.h"
   5 #include "texture1d.h"
   6 #include "texture1d_backend.h"
   7
   8 namespace Msp {
   9 namespace GL {
  10
  11 OpenGLTexture1D::OpenGLTexture1D():
  12         Texture(GL_TEXTURE_1D)
  13 {
  14         static Require _req(MSP_texture1D);
  15 }
  16
  17 void OpenGLTexture1D::allocate()
  18 {
  19         unsigned width = static_cast<const Texture1D *>(this)->width;
  20         unsigned levels = static_cast<const Texture1D *>(this)->levels;
  21
  22         GLenum gl_fmt = get_gl_pixelformat(storage_fmt);
  23         if(ARB_texture_storage)
  24         {
  25                 if(ARB_direct_state_access)
  26                         glTextureStorage1D(id, levels, gl_fmt, width);
  27                 else
  28                 {
  29                         bind_scratch();
  30                         glTexStorage1D(target, levels, gl_fmt, width);
  31                 }
  32         }
  33         else
  34         {
  35                 bind_scratch();
  36                 glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, levels-1);
  37                 GLenum comp = get_gl_components(get_components(storage_fmt));
  38                 GLenum type = get_gl_type(get_component_type(storage_fmt));
  39                 for(unsigned i=0; i<levels; ++i)
  40                 {
  41                         unsigned lv_size = static_cast<const Texture1D *>(this)->get_level_size(i);
  42                         glTexImage1D(target, i, gl_fmt, lv_size, 0, comp, type, 0);
  43                 }
  44         }
  45
  46         apply_swizzle();
  47 }
  48
  49 void OpenGLTexture1D::sub_image(unsigned level, int x, unsigned wd, const void *data)
  50 {
  51         GLenum comp = get_gl_components(get_components(storage_fmt));
  52         GLenum type = get_gl_type(get_component_type(storage_fmt));
  53         if(ARB_direct_state_access)
  54                 glTextureSubImage1D(id, level, x, wd, comp, type, data);
  55         else
  56         {
  57                 bind_scratch();
  58                 glTexSubImage1D(target, level, x, wd, comp, type, data);
  59         }
  60 }
  61
  62 } // namespace GL
  63 } // namespace Msp