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-rw-r--r--video/out/gl_utils.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/video/out/gl_utils.c b/video/out/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 General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * You can alternatively redistribute this file 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.
+ */
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common/common.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 glCheckError(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));
+ }
+}
+
+// return the number of bytes per pixel for the given format
+// does not handle all possible variants, just those used by mpv
+int glFmt2bpp(GLenum format, GLenum type)
+{
+ int component_size = 0;
+ switch (type) {
+ case GL_UNSIGNED_BYTE_3_3_2:
+ case GL_UNSIGNED_BYTE_2_3_3_REV:
+ return 1;
+ case GL_UNSIGNED_SHORT_5_5_5_1:
+ case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+ case GL_UNSIGNED_SHORT_5_6_5:
+ case GL_UNSIGNED_SHORT_5_6_5_REV:
+ return 2;
+ case GL_UNSIGNED_BYTE:
+ component_size = 1;
+ break;
+ case GL_UNSIGNED_SHORT:
+ component_size = 2;
+ break;
+ }
+ switch (format) {
+ case GL_LUMINANCE:
+ case GL_ALPHA:
+ return component_size;
+ case GL_RGB_422_APPLE:
+ return 2;
+ case GL_RGB:
+ case GL_BGR:
+ case GL_RGB_INTEGER:
+ return 3 * component_size;
+ case GL_RGBA:
+ case GL_BGRA:
+ case GL_RGBA_INTEGER:
+ return 4 * component_size;
+ case GL_RED:
+ case GL_RED_INTEGER:
+ return component_size;
+ case GL_RG:
+ case GL_LUMINANCE_ALPHA:
+ case GL_RG_INTEGER:
+ return 2 * component_size;
+ }
+ abort(); // unknown
+}
+
+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
+// slice: height of an upload slice, 0 for all at once
+void glUploadTex(GL *gl, GLenum target, GLenum format, GLenum type,
+ const void *dataptr, int stride,
+ int x, int y, int w, int h, int slice)
+{
+ const uint8_t *data = dataptr;
+ int y_max = y + h;
+ if (w <= 0 || h <= 0)
+ return;
+ if (slice <= 0)
+ slice = h;
+ if (stride < 0) {
+ data += (h - 1) * stride;
+ stride = -stride;
+ }
+ gl->PixelStorei(GL_UNPACK_ALIGNMENT, get_alignment(stride));
+ bool use_rowlength = slice > 1 && (gl->mpgl_caps & MPGL_CAP_ROW_LENGTH);
+ if (use_rowlength) {
+ // this is not always correct, but should work for MPlayer
+ gl->PixelStorei(GL_UNPACK_ROW_LENGTH, stride / glFmt2bpp(format, type));
+ } else {
+ if (stride != glFmt2bpp(format, type) * 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 (use_rowlength)
+ gl->PixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ gl->PixelStorei(GL_UNPACK_ALIGNMENT, 4);
+}
+
+// Like glUploadTex, but upload a byte array with all elements set to val.
+// If scratch is not NULL, points to a resizeable talloc memory block than can
+// be freely used by the function (for avoiding temporary memory allocations).
+void glClearTex(GL *gl, GLenum target, GLenum format, GLenum type,
+ int x, int y, int w, int h, uint8_t val, void **scratch)
+{
+ int bpp = glFmt2bpp(format, type);
+ int stride = w * bpp;
+ int size = h * stride;
+ if (size < 1)
+ return;
+ void *data = scratch ? *scratch : NULL;
+ if (talloc_get_size(data) < size)
+ data = talloc_realloc(NULL, data, char *, size);
+ memset(data, val, size);
+ gl->PixelStorei(GL_UNPACK_ALIGNMENT, get_alignment(stride));
+ gl->TexSubImage2D(target, 0, x, y, w, h, format, type, data);
+ gl->PixelStorei(GL_UNPACK_ALIGNMENT, 4);
+ if (scratch) {
+ *scratch = data;
+ } else {
+ talloc_free(data);
+ }
+}
+
+mp_image_t *glGetWindowScreenshot(GL *gl)
+{
+ if (gl->es)
+ return NULL; // ES can't read from front buffer
+ GLint vp[4]; //x, y, w, h
+ gl->GetIntegerv(GL_VIEWPORT, vp);
+ mp_image_t *image = mp_image_alloc(IMGFMT_RGB24, vp[2], vp[3]);
+ if (!image)
+ return NULL;
+ gl->PixelStorei(GL_PACK_ALIGNMENT, 1);
+ gl->ReadBuffer(GL_FRONT);
+ //flip image while reading (and also avoid stride-related trouble)
+ for (int y = 0; y < vp[3]; y++) {
+ gl->ReadPixels(vp[0], vp[1] + vp[3] - y - 1, vp[2], 1,
+ GL_RGB, GL_UNSIGNED_BYTE,
+ image->planes[0] + y * image->stride[0]);
+ }
+ gl->PixelStorei(GL_PACK_ALIGNMENT, 4);
+ return image;
+}
+
+void mp_log_source(struct mp_log *log, int lev, const char *src)
+{
+ int line = 1;
+ if (!src)
+ return;
+ while (*src) {
+ const char *end = strchr(src, '\n');
+ const char *next = end + 1;
+ if (!end)
+ next = end = src + strlen(src);
+ mp_msg(log, lev, "[%3d] %.*s\n", line, (int)(end - src), src);
+ line++;
+ src = next;
+ }
+}
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