FlatVideoScene Class Reference

#include <opengl_utils.hpp>

Collaboration diagram for FlatVideoScene:

Public Member Functions
	FlatVideoScene ()=default
void	enableDeinterlacing (bool enable)
GLuint	get_texture ()
void	init ()
void	put_frame (video_frame *f)
void	render ()
void	resize (int width, int height)

Private Attributes
video_desc	current_desc
GlProgram	program
Model	quad
int	screen_height
int	screen_width
Texture	texture
FrameUploader	uploader

Detailed Description

Definition at line 398 of file opengl_utils.hpp.

Constructor & Destructor Documentation

FlatVideoScene()

FlatVideoScene::FlatVideoScene ( )

default

Member Function Documentation

enableDeinterlacing()

void FlatVideoScene::enableDeinterlacing

(

bool

enable

)

Definition at line 432 of file opengl_utils.cpp.

                                                   {
        glUseProgram(program.get());
 
        GLuint pvLoc;
        pvLoc = glGetUniformLocation(program.get(), "deinterlace");
        glUniform1i(pvLoc, enable);
}

References GlProgram::get(), and program.

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get_texture()

GLuint FlatVideoScene::get_texture ( )

inline

Definition at line 409 of file opengl_utils.hpp.

{ return texture.get(); }

References Texture::get(), and texture.

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init()

void FlatVideoScene::init

(

)

Definition at line 352 of file opengl_utils.cpp.

                         {
        const char *vert_src = R"END(
#version 330 core
layout(location = 0) in vec2 vert_pos;
layout(location = 1) in vec2 vert_uv;
 
uniform vec2 scale_vec;
 
out vec2 UV;
 
void main(){
        gl_Position = vec4(vert_pos * scale_vec, 0.0f, 1.0f);
        UV = vert_uv;
}
)END";
 
        const char *frag_src = R"END(
#version 330 core
in vec2 UV;
out vec3 color;
uniform sampler2D tex;
uniform bool deinterlace = false;
void main(){
        color = texture(tex, UV).rgb;
 
        if(deinterlace){
                float lineOff = 1.0f / textureSize(tex, 0).y;
                vec3 pix_down = texture(tex, vec2(UV.x, UV.y + lineOff)).rgb;
                color = (color + pix_down) / 2.0f;
        }
}
)END";
 
        program = GlProgram(vert_src, frag_src);
        quad = Model::get_quad();
        texture.allocate();
        uploader.attach_dst_texture(&texture);
        uploader.enable_pbo(false);
}

References Texture::allocate(), FrameUploader::attach_dst_texture(), FrameUploader::enable_pbo(), frag_src, Model::get_quad(), program, quad, texture, uploader, and vert_src.

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put_frame()

void FlatVideoScene::put_frame

(

video_frame *

f

)

Definition at line 392 of file opengl_utils.cpp.

                                            {
        auto frame_desc = video_desc_from_frame(f);
        if(!video_desc_eq(frame_desc, current_desc)){
                current_desc = frame_desc;
                resize(screen_width, screen_height);
        }
 
        uploader.put_frame(f, false);
}

References current_desc, FrameUploader::put_frame(), resize(), screen_height, screen_width, uploader, video_desc_eq(), and video_desc_from_frame().

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render()

void FlatVideoScene::render

(

)

Definition at line 402 of file opengl_utils.cpp.

                           {
        glUseProgram(program.get());
 
        glViewport(0, 0, screen_width, screen_height);
        glBindTexture(GL_TEXTURE_2D, texture.get());
        quad.render();
}

References GlProgram::get(), Texture::get(), program, quad, Model::render(), screen_height, screen_width, and texture.

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resize()

void FlatVideoScene::resize	(	int	width,
		int	height )

Definition at line 410 of file opengl_utils.cpp.

                                                {
        screen_width = width;
        screen_height = height;
 
        double x = 1.0;
        double y = -1.0;
 
        double screen_aspect = (double) width / height;
        double video_aspect = (double) current_desc.width / current_desc.height;
        if(screen_aspect > video_aspect) {
                x = (double) height * video_aspect / width;
        } else {
                y = (double) -width / (height * video_aspect);
        }
 
        glUseProgram(program.get());
 
        GLuint pvLoc;
        pvLoc = glGetUniformLocation(program.get(), "scale_vec");
        glUniform2f(pvLoc, x, y);
}

References current_desc, GlProgram::get(), video_desc::height, program, screen_height, screen_width, and video_desc::width.

Referenced by put_frame().

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Member Data Documentation

current_desc

video_desc FlatVideoScene::current_desc

private

Definition at line 416 of file opengl_utils.hpp.

Referenced by put_frame(), and resize().

program

GlProgram FlatVideoScene::program

private

Definition at line 411 of file opengl_utils.hpp.

Referenced by enableDeinterlacing(), init(), render(), and resize().

quad

Model FlatVideoScene::quad

private

Definition at line 412 of file opengl_utils.hpp.

Referenced by init(), and render().

screen_height

int FlatVideoScene::screen_height

private

Definition at line 418 of file opengl_utils.hpp.

Referenced by put_frame(), render(), and resize().

screen_width

int FlatVideoScene::screen_width

private

Definition at line 417 of file opengl_utils.hpp.

Referenced by put_frame(), render(), and resize().

texture

Texture FlatVideoScene::texture

private

Definition at line 413 of file opengl_utils.hpp.

Referenced by get_texture(), init(), and render().

uploader

FrameUploader FlatVideoScene::uploader

private

Definition at line 414 of file opengl_utils.hpp.

Referenced by init(), and put_frame().

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

• src/video_display/opengl_utils.hpp
• src/video_display/opengl_utils.cpp