Here is some of what the dysfunctional chromium spits out into stderr (and I compared; the same is not printed with the old, working mesa version):
[18445:18445:0715/163105.255334:ERROR:shared_context_state.cc(81)] Skia shader compilation error
------------------------
// Vertex SKSL
#extension GL_NV_shader_noperspective_interpolation: require
uniform float4 sk_RTAdjust;uniform float2 uAtlasSizeInv_S0;in float2 inPosition;in half4 inColor;in ushort2 inTextureCoords;noperspective out float2 vTextureCoords_S0;flat out float vTexIndex_S0;noperspective out half4 vinColor_S0;void main() {// Primitive Processor BitmapText
int texIdx = 0;float2 unormTexCoords = float2(inTextureCoords.x, inTextureCoords.y);vTextureCoords_S0 = unormTexCoords * uAtlasSizeInv_S0;vTexIndex_S0 = float(texIdx);vinColor_S0 = inColor;float2 _tmp_1_inPosition = inPosition;sk_Position = inPosition.xy01;}
// Fragment SKSL
#extension GL_NV_shader_noperspective_interpolation: require
uniform sampler2D uTextureSampler_0_S0;
noperspective in float2 vTextureCoords_S0;flat in float vTexIndex_S0;noperspective in half4 vinColor_S0;void main() {// Stage 0, BitmapText
half4 outputColor_S0;outputColor_S0 = vinColor_S0;half4 texColor;{ texColor = sample(uTextureSampler_0_S0, vTextureCoords_S0).rrrr; }half4 outputCoverage_S0 = texColor;{ // Xfer Processor: Porter Duff
sk_FragColor = outputColor_S0 * outputCoverage_S0;}}
// Vertex GLSL
#version 300 es
#extension GL_NV_shader_noperspective_interpolation : require
precision mediump float;
precision mediump sampler2D;
uniform highp vec4 sk_RTAdjust;
uniform highp vec2 uAtlasSizeInv_S0;
in highp vec2 inPosition;
in mediump vec4 inColor;
in mediump uvec2 inTextureCoords;
noperspective out highp vec2 vTextureCoords_S0;
flat out highp float vTexIndex_S0;
noperspective out mediump vec4 vinColor_S0;
void main() {
highp int texIdx = 0;
highp vec2 unormTexCoords = vec2(float(inTextureCoords.x), float(inTextureCoords.y));
vTextureCoords_S0 = unormTexCoords * uAtlasSizeInv_S0;
vTexIndex_S0 = float(texIdx);
vinColor_S0 = inColor;
gl_Position = vec4(inPosition, 0.0, 1.0);
gl_Position = vec4(gl_Position.xy * sk_RTAdjust.xz + gl_Position.ww * sk_RTAdjust.yw, 0.0, gl_Position.w);
}
// Fragment GLSL
#version 300 es
#extension GL_NV_shader_noperspective_interpolation : require
precision mediump float;
precision mediump sampler2D;
out mediump vec4 sk_FragColor;
uniform sampler2D uTextureSampler_0_S0;
noperspective in highp vec2 vTextureCoords_S0;
flat in highp float vTexIndex_S0;
noperspective in mediump vec4 vinColor_S0;
void main() {
mediump vec4 outputColor_S0;
outputColor_S0 = vinColor_S0;
mediump vec4 texColor;
{
texColor = texture(uTextureSampler_0_S0, vTextureCoords_S0, -0.5).xxxx;
}
mediump vec4 outputCoverage_S0 = texColor;
{
sk_FragColor = outputColor_S0 * outputCoverage_S0;
}
}
Errors:
link failed but did not provide an info log
And that same long thing repeats many many times.