hvirtual/guicast/bctexture.C

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#define GL_GLEXT_PROTOTYPES

#include "bcsynchronous.h"
#include "bctexture.h"
#include "bcwindowbase.h"
#include "colormodels.h"


BC_Texture::BC_Texture(int w, int h, int colormodel)
{
        this->w = w;
        this->h = h;
        this->colormodel = colormodel;
        texture_id = -1;
        texture_id = -1;
        texture_w = 0;
        texture_h = 0;
        texture_components = 0;
        window_id = -1;
        create_texture(w, h, colormodel);
}


BC_Texture::~BC_Texture()
{
        clear_objects();
}

void BC_Texture::clear_objects()
{
        if(get_texture_id() >= 0)
        {
// printf("VFrame::clear_objects %p window_id=%d texture_id=%d w=%d h=%d\n", 
// this, window_id, texture_id, texture_w, texture_h);
                BC_WindowBase::get_synchronous()->release_texture(
                        window_id,
                        texture_id);
                texture_id = -1;
        }
}

void BC_Texture::new_texture(BC_Texture **texture,
        int w, 
        int h, 
        int colormodel)
{
        if(!(*texture))
        {
                (*texture) = new BC_Texture(w, h, colormodel);
        }
        else
        {
                (*texture)->create_texture(w, h, colormodel);
        }
}

void BC_Texture::create_texture(int w, int h, int colormodel)
{
#ifdef HAVE_GL

// Get max texture size from the server.
// Maximum size was 4096 on the earliest cards that could do video.
        int max_texture_size = 0;
        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);

// Calculate dimensions of texture
        int new_w = calculate_texture_size(w, &max_texture_size);
        int new_h = calculate_texture_size(h, &max_texture_size);
        int new_components = cmodel_components(colormodel);


        if(new_w < w || new_h < h)
        {
                printf("BC_Texture::create_texture frame size %dx%d bigger than maximum texture %dx%d.\n",
                        w, 
                        h,
                        max_texture_size, 
                        max_texture_size);
        }

// Delete existing texture
        if(texture_id >= 0 && 
                (new_h != texture_h ||
                new_w != texture_w ||
                new_components != texture_components ||
                BC_WindowBase::get_synchronous()->current_window->get_id() != window_id))
        {
// printf("BC_Texture::create_texture released window_id=%d texture_id=%d\n", 
// BC_WindowBase::get_synchronous()->current_window->get_id(),
// texture_id);
                BC_WindowBase::get_synchronous()->release_texture(
                        window_id,
                        texture_id);
            texture_id = -1;
            window_id = -1;
        }


        texture_w = new_w;
        texture_h = new_h;
        texture_components = new_components;

// Get matching texture
        if(texture_id < 0)
        {
                texture_id = BC_WindowBase::get_synchronous()->get_texture(
                        texture_w, 
                        texture_h,
                        texture_components);
// A new VFrame has no window_id, so it must read it from the matching texture.
                if(texture_id >= 0) 
                        window_id = BC_WindowBase::get_synchronous()->current_window->get_id();
        }


// No matching texture exists.
// Create new texture with the proper dimensions
        if(texture_id < 0)
        {
                glGenTextures(1, (GLuint*)&texture_id);
                glBindTexture(GL_TEXTURE_2D, (GLuint)texture_id);
                glEnable(GL_TEXTURE_2D);
                if(texture_components == 4)
                        glTexImage2D(GL_TEXTURE_2D, 
                                0, 
                                4, 
                                texture_w, 
                        texture_h, 
                                0, 
                                GL_RGBA, 
                                GL_UNSIGNED_BYTE,
                        0);
                else
                        glTexImage2D(GL_TEXTURE_2D, 
                                0, 
                                3, 
                                texture_w, 
                        texture_h, 
                                0, 
                                GL_RGB, 
                                GL_UNSIGNED_BYTE,
                        0);

                window_id = BC_WindowBase::get_synchronous()->current_window->get_id();
                BC_WindowBase::get_synchronous()->put_texture(texture_id,
                        texture_w,
                        texture_h,
                        texture_components);
// printf("VFrame::new_texture created texture_id=%d window_id=%d\n", 
// *texture_id,
// *window_id);
        }
        else
        {
                glBindTexture(GL_TEXTURE_2D, (GLuint)texture_id);
                glEnable(GL_TEXTURE_2D);
        }
#endif
}

int BC_Texture::calculate_texture_size(int w, int *max)
{
        int i;
        for(i = 2; (max && i <= *max) || (!max && i < w); i *= 2)
        {
                if(i >= w) 
                {
                        return i;
                        break;
                }
        }
        if(max && i > *max) return 16;
        return i;
}

int BC_Texture::get_texture_id()
{
        return texture_id;
}

int BC_Texture::get_texture_w()
{
        return texture_w;
}

int BC_Texture::get_texture_h()
{
        return texture_h;
}

int BC_Texture::get_texture_components()
{
        return texture_components;
}

int BC_Texture::get_window_id()
{
        return window_id;
}


void BC_Texture::bind(int texture_unit)
{
#ifdef HAVE_GL
// Bind the texture
        if(texture_id >= 0)
        {
                if(texture_unit >= 0) glActiveTexture(GL_TEXTURE0 + texture_unit);
                glBindTexture(GL_TEXTURE_2D, texture_id);
                glEnable(GL_TEXTURE_2D);
                if(texture_unit >= 0) 
                {
                        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

// GL_REPEAT in this case causes the upper left corners of the masks
// to blur.
                        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
                        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

// Get the texture to alpha blend
                        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
                }
        }
#endif
}

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