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#include "CameraCubeMapDecl.h"
#include "textures/CubeMapTexture.h"
#include "debugging/gl.h"
#include "itextstream.h"
#include <stdexcept>
namespace shaders
{
// Constructor
CameraCubeMapDecl::CameraCubeMapDecl(const std::string& prefix)
: _prefix(prefix)
{ }
// Public construction method
NamedBindablePtr CameraCubeMapDecl::createForPrefix(const std::string& prefix)
{
return NamedBindablePtr(new CameraCubeMapDecl(prefix));
}
// Bind directional image
void CameraCubeMapDecl::bindDirection(const std::string& dir,
GLuint glDir) const
{
// Load the image
ImagePtr img = GlobalImageLoader().imageFromVFS(_prefix + dir);
if (!img)
{
throw std::runtime_error(
"Camera cube map directional image not found: "
+ _prefix + dir
);
}
// Bind the image to OpenGL
glTexImage2D(
glDir,
0, //level
GL_RGBA, //internal format
static_cast<GLsizei>(img->getWidth()), //width
static_cast<GLsizei>(img->getHeight()), //height
0, //border
GL_RGBA, //format
GL_UNSIGNED_BYTE, //type
img->getPixels()
);
debug::assertNoGlErrors();
}
/* NamedBindable implementation */
std::string CameraCubeMapDecl::getIdentifier() const
{
return "_cameraCubeMap_" + _prefix;
}
std::string CameraCubeMapDecl::getExpressionString()
{
return _prefix;
}
TexturePtr CameraCubeMapDecl::bindTexture(const std::string& name,
Role /* role */) const
{
// Load the six images from the prefix
try
{
// Allocate the GL texture
GLuint texnum;
glGenTextures(1, &texnum);
glBindTexture(GL_TEXTURE_CUBE_MAP, texnum);
// Set filtering and mipmapping
glTexParameteri(
GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR
);
glTexParameteri(
GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR
);
glTexParameteri(
GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE
);
// Bind the images
bindDirection("_right", GL_TEXTURE_CUBE_MAP_POSITIVE_X);
bindDirection("_left", GL_TEXTURE_CUBE_MAP_NEGATIVE_X);
bindDirection("_up", GL_TEXTURE_CUBE_MAP_POSITIVE_Y);
bindDirection("_down", GL_TEXTURE_CUBE_MAP_NEGATIVE_Y);
bindDirection("_forward", GL_TEXTURE_CUBE_MAP_POSITIVE_Z);
bindDirection("_back", GL_TEXTURE_CUBE_MAP_NEGATIVE_Z);
rMessage() << "[shaders] bound cubemap texture " << texnum << std::endl;
// Unbind and create texture object
glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
return TexturePtr(new CubeMapTexture(texnum, name));
}
catch (const std::runtime_error& e)
{
rError() << "[shaders] Unable to bind camera cubemap '"
<< name << "': " << e.what() << std::endl;
return TexturePtr();
}
}
}
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