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mpv/video/out/opengl/gl_utils.c

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/*
* This file is part of mpv.
* Parts based on MPlayer code by Reimar Döffinger.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <assert.h>
#include <libavutil/sha.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/mem.h>
#include "osdep/io.h"
#include "common/common.h"
#include "options/path.h"
#include "stream/stream.h"
#include "formats.h"
#include "ra_gl.h"
#include "gl_utils.h"
// GLU has this as gluErrorString (we don't use GLU, as it is legacy-OpenGL)
static const char *gl_error_to_string(GLenum error)
{
switch (error) {
case GL_INVALID_ENUM: return "INVALID_ENUM";
case GL_INVALID_VALUE: return "INVALID_VALUE";
case GL_INVALID_OPERATION: return "INVALID_OPERATION";
case GL_INVALID_FRAMEBUFFER_OPERATION: return "INVALID_FRAMEBUFFER_OPERATION";
case GL_OUT_OF_MEMORY: return "OUT_OF_MEMORY";
default: return "unknown";
}
}
void gl_check_error(GL *gl, struct mp_log *log, const char *info)
{
for (;;) {
GLenum error = gl->GetError();
if (error == GL_NO_ERROR)
break;
mp_msg(log, MSGL_ERR, "%s: OpenGL error %s.\n", info,
gl_error_to_string(error));
}
}
static int get_alignment(int stride)
{
if (stride % 8 == 0)
return 8;
if (stride % 4 == 0)
return 4;
if (stride % 2 == 0)
return 2;
return 1;
}
// upload a texture, handling things like stride and slices
// target: texture target, usually GL_TEXTURE_2D
// format, type: texture parameters
// dataptr, stride: image data
// x, y, width, height: part of the image to upload
void gl_upload_tex(GL *gl, GLenum target, GLenum format, GLenum type,
const void *dataptr, int stride,
int x, int y, int w, int h)
{
int bpp = gl_bytes_per_pixel(format, type);
const uint8_t *data = dataptr;
int y_max = y + h;
if (w <= 0 || h <= 0 || !bpp)
return;
if (stride < 0) {
data += (h - 1) * stride;
stride = -stride;
}
gl->PixelStorei(GL_UNPACK_ALIGNMENT, get_alignment(stride));
int slice = h;
if (gl->mpgl_caps & MPGL_CAP_ROW_LENGTH) {
// this is not always correct, but should work for MPlayer
gl->PixelStorei(GL_UNPACK_ROW_LENGTH, stride / bpp);
} else {
if (stride != bpp * w)
slice = 1; // very inefficient, but at least it works
}
for (; y + slice <= y_max; y += slice) {
gl->TexSubImage2D(target, 0, x, y, w, slice, format, type, data);
data += stride * slice;
}
if (y < y_max)
gl->TexSubImage2D(target, 0, x, y, w, y_max - y, format, type, data);
if (gl->mpgl_caps & MPGL_CAP_ROW_LENGTH)
gl->PixelStorei(GL_UNPACK_ROW_LENGTH, 0);
gl->PixelStorei(GL_UNPACK_ALIGNMENT, 4);
}
mp_image_t *gl_read_fbo_contents(GL *gl, int fbo, int w, int h)
{
if (gl->es)
return NULL; // ES can't read from front buffer
mp_image_t *image = mp_image_alloc(IMGFMT_RGB24, w, h);
if (!image)
return NULL;
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
GLenum obj = fbo ? GL_COLOR_ATTACHMENT0 : GL_FRONT;
gl->PixelStorei(GL_PACK_ALIGNMENT, 1);
gl->ReadBuffer(obj);
//flip image while reading (and also avoid stride-related trouble)
for (int y = 0; y < h; y++) {
gl->ReadPixels(0, h - y - 1, w, 1, GL_RGB, GL_UNSIGNED_BYTE,
image->planes[0] + y * image->stride[0]);
}
gl->PixelStorei(GL_PACK_ALIGNMENT, 4);
gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
return image;
}
static void gl_vao_enable_attribs(struct gl_vao *vao)
{
GL *gl = vao->gl;
for (int n = 0; n < vao->num_entries; n++) {
const struct ra_renderpass_input *e = &vao->entries[n];
GLenum type = 0;
bool normalized = false;
switch (e->type) {
case RA_VARTYPE_INT:
type = GL_INT;
break;
case RA_VARTYPE_FLOAT:
type = GL_FLOAT;
break;
case RA_VARTYPE_BYTE_UNORM:
type = GL_UNSIGNED_BYTE;
normalized = true;
break;
default:
abort();
}
assert(e->dim_m == 1);
gl->EnableVertexAttribArray(n);
gl->VertexAttribPointer(n, e->dim_v, type, normalized,
vao->stride, (void *)(intptr_t)e->offset);
}
}
void gl_vao_init(struct gl_vao *vao, GL *gl, int stride,
const struct ra_renderpass_input *entries,
int num_entries)
{
assert(!vao->vao);
assert(!vao->buffer);
*vao = (struct gl_vao){
.gl = gl,
.stride = stride,
.entries = entries,
.num_entries = num_entries,
};
gl->GenBuffers(1, &vao->buffer);
if (gl->BindVertexArray) {
gl->BindBuffer(GL_ARRAY_BUFFER, vao->buffer);
gl->GenVertexArrays(1, &vao->vao);
gl->BindVertexArray(vao->vao);
gl_vao_enable_attribs(vao);
gl->BindVertexArray(0);
gl->BindBuffer(GL_ARRAY_BUFFER, 0);
}
}
void gl_vao_uninit(struct gl_vao *vao)
{
GL *gl = vao->gl;
if (!gl)
return;
if (gl->DeleteVertexArrays)
gl->DeleteVertexArrays(1, &vao->vao);
gl->DeleteBuffers(1, &vao->buffer);
*vao = (struct gl_vao){0};
}
static void gl_vao_bind(struct gl_vao *vao)
{
GL *gl = vao->gl;
if (gl->BindVertexArray) {
gl->BindVertexArray(vao->vao);
} else {
gl->BindBuffer(GL_ARRAY_BUFFER, vao->buffer);
gl_vao_enable_attribs(vao);
gl->BindBuffer(GL_ARRAY_BUFFER, 0);
}
}
static void gl_vao_unbind(struct gl_vao *vao)
{
GL *gl = vao->gl;
if (gl->BindVertexArray) {
gl->BindVertexArray(0);
} else {
for (int n = 0; n < vao->num_entries; n++)
gl->DisableVertexAttribArray(n);
}
}
// Draw the vertex data (as described by the gl_vao_entry entries) in ptr
// to the screen. num is the number of vertexes. prim is usually GL_TRIANGLES.
// If ptr is NULL, then skip the upload, and use the data uploaded with the
// previous call.
void gl_vao_draw_data(struct gl_vao *vao, GLenum prim, void *ptr, size_t num)
{
GL *gl = vao->gl;
if (ptr) {
gl->BindBuffer(GL_ARRAY_BUFFER, vao->buffer);
gl->BufferData(GL_ARRAY_BUFFER, num * vao->stride, ptr, GL_STREAM_DRAW);
gl->BindBuffer(GL_ARRAY_BUFFER, 0);
}
gl_vao_bind(vao);
gl->DrawArrays(prim, 0, num);
gl_vao_unbind(vao);
}
static void GLAPIENTRY gl_debug_cb(GLenum source, GLenum type, GLuint id,
GLenum severity, GLsizei length,
const GLchar *message, const void *userParam)
{
// keep in mind that the debug callback can be asynchronous
struct mp_log *log = (void *)userParam;
int level = MSGL_ERR;
switch (severity) {
case GL_DEBUG_SEVERITY_NOTIFICATION:level = MSGL_V; break;
case GL_DEBUG_SEVERITY_LOW: level = MSGL_INFO; break;
case GL_DEBUG_SEVERITY_MEDIUM: level = MSGL_WARN; break;
case GL_DEBUG_SEVERITY_HIGH: level = MSGL_ERR; break;
}
mp_msg(log, level, "GL: %s\n", message);
}
void gl_set_debug_logger(GL *gl, struct mp_log *log)
{
if (gl->DebugMessageCallback)
gl->DebugMessageCallback(log ? gl_debug_cb : NULL, log);
}
int gl_get_fb_depth(GL *gl, int fbo)
{
if ((gl->es < 300 && !gl->version) || !(gl->mpgl_caps & MPGL_CAP_FB))
return -1;
gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
GLenum obj = gl->version ? GL_BACK_LEFT : GL_BACK;
if (fbo)
obj = GL_COLOR_ATTACHMENT0;
GLint depth_g = -1;
gl->GetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, obj,
GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE, &depth_g);
gl->BindFramebuffer(GL_FRAMEBUFFER, 0);
return depth_g > 0 ? depth_g : -1;
}
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