renderer/gl: add internal gl formats and reduce internal driver format conversions (#12879)

* format: add internal formats for drm formats

cross referenced with weston and added internal formats and types for a
lot of missing ones. also added a isFormatYUV helper.

* framebuffer: ensure we use right internalformat

ensure we use the right internal format to avoid internal driver
blitting, also since we only attach the GL_STENCIL_ATTACHMENT we might
just aswell only use the GL_STENCIL_INDEX8 to not confuse drivers that
we want a depth aswell.

* texture: use external on yuv or non linear mods

using external makes us use the gpu's internal detiler.
and this is makes intel a lot happier then having to format convert it
to a linear format internally.

* shaders: add external support to CM frag

add external support to CM frag, and correct ext.frag typo.

* formats: remove duplicates and fix a typo in cm.frag

remove duplicate formats and a typo in cm.frag

* formats: add swizzle logic to all formats

add swizzle logic from weston for all formats and use it in shm texture
paths.

* format: more format changes

use monitor drm format instead of forcing something different.

* shader: remove external from cm.frag

drivers want this resolved at compiletime cant use both
samplerExternalOES and sampler2d and then runtime branch it.

* screencopy: swizzle textures in screencopy

swizzle textures in screencopy, to get the right colors when copying.

* screencopy: restore old behaviour

try restore old behaviour before the gles3 format changes.
glReadPixels had the wrong format, so i went to far trying to mitigate
it. should be like before now.

2 files changed, 4 insertions, 6 deletions

diff --git a/src/render/shaders/glsl/CM.frag b/src/render/shaders/glsl/CM.frag
index 031fe7f3..7f075b82 100644
--- a/src/render/shaders/glsl/CM.frag
+++ b/src/render/shaders/glsl/CM.frag
@@ -1,11 +1,9 @@
 #version 300 es
-//#extension GL_OES_EGL_image_external : require
 #extension GL_ARB_shading_language_include : enable
 
 precision highp float;
 in vec2 v_texcoord;
 uniform sampler2D tex;
-//uniform samplerExternalOES texture0;
 
 uniform int texType; // eTextureType: 0 - rgba, 1 - rgbx, 2 - ext
 // uniform int skipCM;
@@ -30,8 +28,8 @@ void main() {
     vec4 pixColor;
     if (texType == 1)
         pixColor = vec4(texture(tex, v_texcoord).rgb, 1.0);
-//    else if (texType == 2)
-//        pixColor = texture(texture0, v_texcoord);
+    //else if (texType == 2)
+    //    discard; // this shouldnt happen.
     else // assume rgba
         pixColor = texture(tex, v_texcoord);
 
diff --git a/src/render/shaders/glsl/ext.frag b/src/render/shaders/glsl/ext.frag
index f540a9f9..e855a832 100644
--- a/src/render/shaders/glsl/ext.frag
+++ b/src/render/shaders/glsl/ext.frag
@@ -5,7 +5,7 @@
 
 precision highp float;
 in vec2 v_texcoord;
-uniform samplerExternalOES texture0;
+uniform samplerExternalOES tex;
 uniform float alpha;
 
 #include "rounding.glsl"
@@ -20,7 +20,7 @@ uniform vec3 tint;
 layout(location = 0) out vec4 fragColor;
 void main() {
 
-    vec4 pixColor = texture(texture0, v_texcoord);
+    vec4 pixColor = texture(tex, v_texcoord);
 
     if (discardOpaque == 1 && pixColor[3] * alpha == 1.0)
 	discard;