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renderer: optimise shader usage further, split shaders and add more caching (#12992)

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* shader: split CM rgba/rgbx into discard ones

make it branchless if we have no discards.

* shader: ensure we dont stall on vbo uv buffer

if we render a new texture before the previous was done gpu wise its
going to stall until done, call glBufferData to orphan the data.
this allows the driver to return a new memory block immediately
if the GPU is still reading from the previous one

* protocols: ensure we reset GL_PACK_ALIGNMENT

reset GL_PACK_ALIGNMENT back to the default initial value of 4

* shader: use unsigned short in VAO

loose a tiny bit of precision but gain massive bandwidth reductions.
use GL_UNSIGNED_SHORT and set it as normalized. clamp and round the UV
for uint16_t in customUv.

* shader: interleave vertex buffers

use std::array for fullverts, use a single interleaved buffer for
position and uv, should in theory improve cache locality. and also remove
the need to have two buffers around.

* shader: revert precision drop

we need the float precision because we might have 1.01 or similiar
floats entering CM shader maths, and rounding/clamping those means the
maths turns out wrong. so revert back to float, sadly higher bandwidth
usage.

* update doColorManagement api

* convert primaries to XYZ on cpu

* remove unused primaries uniform

---------

Co-authored-by: UjinT34 <ujint34@mail.ru>
This commit is contained in:
Tom Englund 2026-01-17 15:31:19 +01:00 • committed by GitHub
parent 92a3b91999
commit c99eb23869
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GPG key ID: B5690EEEBB952194
13 changed files with 185 additions and 95 deletions
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15
src/render/shaders/glsl/CMrgba.frag
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@ -7,14 +7,9 @@ uniform sampler2D tex;
uniform int sourceTF; // eTransferFunction
uniform int targetTF; // eTransferFunction
uniform mat4x2 targetPrimaries;
uniform mat3 targetPrimariesXYZ;
uniform float alpha;
uniform bool discardOpaque;
uniform bool discardAlpha;
uniform float discardAlphaValue;
uniform bool applyTint;
uniform vec3 tint;
@ -25,14 +20,8 @@ layout(location = 0) out vec4 fragColor;
void main() {
vec4 pixColor = texture(tex, v_texcoord);
if (discardOpaque && pixColor.a * alpha == 1.0)
discard;
if (discardAlpha && pixColor.a <= discardAlphaValue)
discard;
// this shader shouldn't be used when skipCM == 1
pixColor = doColorManagement(pixColor, sourceTF, targetTF, targetPrimaries);
pixColor = doColorManagement(pixColor, sourceTF, targetTF, targetPrimariesXYZ);
if (applyTint)
pixColor.rgb *= tint;