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Enable trilinear filtering for OpenGL

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Improve downscaling quality if mipmapping is available.

Suggested-by: Giumo Clanjor (哆啦比猫/兰威举) <cjxgm2@gmail.com>

Fixes #40 <https://github.com/Genymobile/scrcpy/issues/40>
Ref: <https://github.com/Genymobile/scrcpy/issues/40#issuecomment-591917787>
This commit is contained in:
Romain Vimont
2020-04-11 16:08:23 +02:00
parent 8a9b20b27e
commit bea7658807
5 changed files with 155 additions and 6 deletions
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56
app/src/opengl.c Normal file
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#include "opengl.h"
#include <assert.h>
#include <stdio.h>
#include "SDL2/SDL.h"
void
sc_opengl_init(struct sc_opengl *gl) {
gl->GetString = SDL_GL_GetProcAddress("glGetString");
assert(gl->GetString);
gl->TexParameterf = SDL_GL_GetProcAddress("glTexParameterf");
assert(gl->TexParameterf);
gl->TexParameteri = SDL_GL_GetProcAddress("glTexParameteri");
assert(gl->TexParameteri);
// optional
gl->GenerateMipmap = SDL_GL_GetProcAddress("glGenerateMipmap");
const char *version = (const char *) gl->GetString(GL_VERSION);
assert(version);
gl->version = version;
#define OPENGL_ES_PREFIX "OpenGL ES "
/* starts with "OpenGL ES " */
gl->is_opengles = !strncmp(gl->version, OPENGL_ES_PREFIX,
sizeof(OPENGL_ES_PREFIX) - 1);
if (gl->is_opengles) {
/* skip the prefix */
version += sizeof(PREFIX) - 1;
}
int r = sscanf(version, "%d.%d", &gl->version_major, &gl->version_minor);
if (r != 2) {
// failed to parse the version
gl->version_major = 0;
gl->version_minor = 0;
}
}
bool
sc_opengl_version_at_least(struct sc_opengl *gl,
int minver_major, int minver_minor,
int minver_es_major, int minver_es_minor)
{
if (gl->is_opengles) {
return gl->version_major > minver_es_major
|| (gl->version_major == minver_es_major
&& gl->version_minor >= minver_es_minor);
}
return gl->version_major > minver_major
|| (gl->version_major == minver_major
&& gl->version_minor >= minver_minor);
}