When I try to create a window (SDL2) with SRGB-capable framebuffer, it fails with the error:
Couldn't find matching GLX visual
I verified with glxinfo to see which GLX visuals are available, and indeed, none of them have the "srgb" option ticked.
I am trying to understand why this is. Is this a hardware limitation of my IGP? Or am I doing something wrong?
OS: Ubuntu 21.10
GPU: Intel Alderlake_s (Gen12)
xdriinfo: Screen 0: iris
OpenGL renderer: Mesa Intel(R) Graphics (ADL-S GT1)
# lshw -class display *-display description: VGA compatible controller product: AlderLake-S GT1 vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 logical name: /dev/fb0 version: 0c width: 64 bits clock: 33MHz capabilities: pciexpress msi pm vga_controller bus_master cap_list rom fb configuration: depth=32 driver=i915 latency=0 mode=2560x1600 visual=truecolor xres=2560 yres=1600 resources: iomemory:600-5ff iomemory:400-3ff irq:145 memory:6002000000-6002ffffff memory:4000000000-400fffffff ioport:6000(size=64) memory:c0000-dffff memory:4010000000-4016ffffff memory:4020000000-40ffffffff
An important goal of almost every graphics program is to draw pictures on the screen. The screen is composed of a rectangular array of pixels, each capable of displaying a tiny square of color at that point in the image. After the rasterization stage (including texturing and fog), the data are not yet pixels, but are fragments. Each fragment has coordinate data which corresponds to a pixel, as well as color and depth values. Then each fragment undergoes a series of tests and operations, some of which have been previously described (See "Blending" in Chapter 6) and others that are discussed in this chapter.