GLTexture Class Reference

This class is a wrapper around a texture handle. More...

#include <gl_texture.hpp>

Inherits Texture.

List of all members.

Public Member Functions
	GLTexture (unsigned int width, unsigned int height)
	GLTexture (SDL_Surface *image)
	~GLTexture ()
const GLuint &	get_handle () const
void	set_handle (GLuint handle)
unsigned int	get_texture_width () const
unsigned int	get_texture_height () const
unsigned int	get_image_width () const
unsigned int	get_image_height () const
void	set_image_width (unsigned int width)
void	set_image_height (unsigned int height)
Protected Attributes
GLuint	handle
unsigned int	texture_width
unsigned int	texture_height
unsigned int	image_width
unsigned int	image_height
Private Member Functions
void	set_texture_params ()

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Detailed Description

This class is a wrapper around a texture handle.

It stores the texture width and height and provides convenience functions for uploading SDL_Surfaces into the texture

Definition at line 27 of file gl_texture.hpp.

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Constructor & Destructor Documentation

GLTexture::GLTexture	(	unsigned int	width,
		unsigned int	height
	)

Definition at line 37 of file gl_texture.cpp.

References GL_RGBA, handle, image_height, image_width, is_power_of_2(), set_texture_params(), texture_height, and texture_width.

                                                            :
  handle(),
  texture_width(),
  texture_height(),
  image_width(),
  image_height()
{
#ifdef GL_VERSION_ES_CM_1_0
  assert(is_power_of_2(width));
  assert(is_power_of_2(height));
#endif
  texture_width  = width;
  texture_height = height;
  image_width  = width;
  image_height = height;

  assert_gl("before creating texture");
  glGenTextures(1, &handle);

  try {
    glBindTexture(GL_TEXTURE_2D, handle);

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
                 texture_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);

    set_texture_params();
  } catch(...) {
    glDeleteTextures(1, &handle);
    throw;
  }
}

GLTexture::GLTexture

(

SDL_Surface *

image

)

Definition at line 69 of file gl_texture.cpp.

References TinyGetText::convert(), GL_RGBA, GLenum, handle, image_height, image_width, next_power_of_two(), set_texture_params(), texture_height, and texture_width.

                                       :
  handle(),
  texture_width(),
  texture_height(),
  image_width(),
  image_height()
{
#ifdef GL_VERSION_ES_CM_1_0
  texture_width = next_power_of_two(image->w);
  texture_height = next_power_of_two(image->h);
#else
  if (GLEW_ARB_texture_non_power_of_two)
  {
    texture_width  = image->w;
    texture_height = image->h;
  }
  else
  {
    texture_width = next_power_of_two(image->w);
    texture_height = next_power_of_two(image->h);
  }
#endif

  image_width  = image->w;
  image_height = image->h;

#if SDL_BYTEORDER == SDL_BIG_ENDIAN
  SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
                                              texture_width, texture_height, 32,
                                              0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
#else
  SDL_Surface* convert = SDL_CreateRGBSurface(SDL_SWSURFACE,
                                              texture_width, texture_height, 32,
                                              0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
#endif

  if(convert == 0) {
    throw std::runtime_error("Couldn't create texture: out of memory");
  }

  SDL_SetAlpha(image, 0, 0);
  SDL_BlitSurface(image, 0, convert, 0);

  assert_gl("before creating texture");
  glGenTextures(1, &handle);

  try {
    GLenum sdl_format;
    if(convert->format->BytesPerPixel == 3)
      sdl_format = GL_RGB;
    else if(convert->format->BytesPerPixel == 4)
      sdl_format = GL_RGBA;
    else {
      sdl_format = GL_RGBA;
      assert(false);
    }

    glBindTexture(GL_TEXTURE_2D, handle);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
#ifdef GL_UNPACK_ROW_LENGTH
    glPixelStorei(GL_UNPACK_ROW_LENGTH, convert->pitch/convert->format->BytesPerPixel);
#else
    /* OpenGL ES doesn't support UNPACK_ROW_LENGTH, let's hope SDL didn't add
     * padding bytes, otherwise we need some extra code here... */
    assert(convert->pitch == texture_width * convert->format->BytesPerPixel);
#endif

    if(SDL_MUSTLOCK(convert))
    {
      SDL_LockSurface(convert);
    }

    if (true)
    { // no not use mipmaps
      glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture_width,
                 texture_height, 0, sdl_format,
                 GL_UNSIGNED_BYTE, convert->pixels);
    }
    else
    { // build mipmaps
      gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, texture_width,
                        texture_height, sdl_format,
                        GL_UNSIGNED_BYTE, convert->pixels);
    }

    if(SDL_MUSTLOCK(convert))
    {
      SDL_UnlockSurface(convert);
    }

    assert_gl("creating texture");

    set_texture_params();
  } catch(...) {
    glDeleteTextures(1, &handle);
    SDL_FreeSurface(convert);
    throw;
  }
  SDL_FreeSurface(convert);
}

GLTexture::~GLTexture

(

)

Definition at line 170 of file gl_texture.cpp.

References handle.

{
  glDeleteTextures(1, &handle);
}

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Member Function Documentation

const GLuint& GLTexture::get_handle

(

)

const [inline]

Definition at line 41 of file gl_texture.hpp.

References handle.

                                   {
    return handle;
  }

void GLTexture::set_handle

(

GLuint

handle

)

[inline]

Definition at line 45 of file gl_texture.hpp.

                                 {
    this->handle = handle;
  }

unsigned int GLTexture::get_texture_width

(

)

const [inline, virtual]

Implements Texture.

Definition at line 49 of file gl_texture.hpp.

References texture_width.

  {
    return texture_width;
  }

unsigned int GLTexture::get_texture_height

(

)

const [inline, virtual]

Implements Texture.

Definition at line 54 of file gl_texture.hpp.

References texture_height.

  {
    return texture_height;
  }

unsigned int GLTexture::get_image_width

(

)

const [inline, virtual]

Implements Texture.

Definition at line 59 of file gl_texture.hpp.

References image_width.

  {
    return image_width;
  }

unsigned int GLTexture::get_image_height

(

)

const [inline, virtual]

Implements Texture.

Definition at line 64 of file gl_texture.hpp.

References image_height.

  {
    return image_height;
  }

void GLTexture::set_image_width

(

unsigned int

width

)

[inline]

Definition at line 69 of file gl_texture.hpp.

References image_width.

  {
    image_width = width;
  }

void GLTexture::set_image_height

(

unsigned int

height

)

[inline]

Definition at line 74 of file gl_texture.hpp.

References image_height.

  {
    image_height = height;
  }

void GLTexture::set_texture_params

(

)

[private]

Definition at line 176 of file gl_texture.cpp.

Referenced by GLTexture().

{
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

  assert_gl("set texture params");
}

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Member Data Documentation

GLuint GLTexture::handle [protected]

Definition at line 30 of file gl_texture.hpp.

Referenced by get_handle(), GLTexture(), and ~GLTexture().

unsigned int GLTexture::texture_width [protected]

Definition at line 31 of file gl_texture.hpp.

Referenced by get_texture_width(), and GLTexture().

unsigned int GLTexture::texture_height [protected]

Definition at line 32 of file gl_texture.hpp.

Referenced by get_texture_height(), and GLTexture().

unsigned int GLTexture::image_width [protected]

Definition at line 33 of file gl_texture.hpp.

Referenced by get_image_width(), GLTexture(), and set_image_width().

unsigned int GLTexture::image_height [protected]

Definition at line 34 of file gl_texture.hpp.

Referenced by get_image_height(), GLTexture(), and set_image_height().

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The documentation for this class was generated from the following files:

• src/video/gl/gl_texture.hpp
• src/video/gl/gl_texture.cpp

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