vlc_gl_sampler Struct Reference

OpenGL sampler. More...

#include <vlc_opengl_sampler.h>

Collaboration diagram for vlc_gl_sampler:

Data Fields
vlc_object_t	obj
module_t *	module
struct vlc_gl_t *	gl
	OpenGL context.
video_format_t	fmt_in
	Input video format.
unsigned	tex_count
	Number of texture planes.
int32_t	tex_widths [(5)]
	Per-plane texture widths.
int32_t	tex_heights [(5)]
	Per-plane texture heights.
uint32_t	tex_target
	GL texture target (e.g.
uint32_t	formats [(5)]
	Per-plane GL format (GLenum values).
bool	half_float
	Whether textures use half-float storage.
const float *	pic_to_tex_matrix
	Matrix to convert from picture coordinates to texture coordinates.
struct {
char *   version
	Version header appropriate for this shader. More...
char *   precision
	Precision preamble appropriate for this shader. More...
char *   extensions
	Piece of fragment shader code declaring OpenGL extensions. More...
char *   body
	Piece of fragment shader code providing the GLSL function vlc_texture(vec2 coords). More...
}	shader
const struct vlc_gl_sampler_ops *	ops
void *	sys
	Private data for the sampler implementation.

Detailed Description

OpenGL sampler.

Generates GLSL code for sampling input textures and handles chroma conversion, transfer functions, and color space mapping.

Field Documentation

body

char* vlc_gl_sampler::body

Piece of fragment shader code providing the GLSL function vlc_texture(vec2 coords).

It is initialized by the sampler, and is never NULL.

Users of this sampler should inject this code into their fragment shader, before any call to vlc_texture().

extensions

char* vlc_gl_sampler::extensions

Piece of fragment shader code declaring OpenGL extensions.

It is initialized by the sampler, and may be NULL if no extensions are required.

If non-NULL, users of this sampler must inject this code into their fragment shader, immediately after the "version" line.

fmt_in

video_format_t vlc_gl_sampler::fmt_in

Input video format.

formats

uint32_t vlc_gl_sampler::formats[(5)]

Per-plane GL format (GLenum values).

gl

struct vlc_gl_t* vlc_gl_sampler::gl

OpenGL context.

half_float

bool vlc_gl_sampler::half_float

Whether textures use half-float storage.

module

module_t* vlc_gl_sampler::module

obj

vlc_object_t vlc_gl_sampler::obj

ops

const struct vlc_gl_sampler_ops* vlc_gl_sampler::ops

Referenced by vlc_gl_sampler_FetchLocations(), vlc_gl_sampler_Load(), vlc_gl_sampler_SelectPlane(), and vlc_gl_sampler_Update().

pic_to_tex_matrix

const float* vlc_gl_sampler::pic_to_tex_matrix

Matrix to convert from picture coordinates to texture coordinates.

The matrix is 2x3 and is stored in column-major order:

/ a b c \
\ d e f /

It is stored as an array of 6 floats:

[a, d, b, e, c, f]

It is NULL before the first picture is available and may theoretically change on every picture.

precision

char* vlc_gl_sampler::precision

Precision preamble appropriate for this shader.

[struct]

struct { ... } vlc_gl_sampler::shader

sys

void* vlc_gl_sampler::sys

Private data for the sampler implementation.

tex_count

unsigned vlc_gl_sampler::tex_count

Number of texture planes.

tex_heights

int32_t vlc_gl_sampler::tex_heights[(5)]

Per-plane texture heights.

tex_target

uint32_t vlc_gl_sampler::tex_target

GL texture target (e.g.

GL_TEXTURE_2D)

tex_widths

int32_t vlc_gl_sampler::tex_widths[(5)]

Per-plane texture widths.

version

char* vlc_gl_sampler::version

Version header appropriate for this shader.

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The documentation for this struct was generated from the following file:

• include/vlc_opengl_sampler.h