mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 10:19:47 -04:00
Martin Penkava
7ad8519128
The plain present path copied the VRAM image into the swapchain with vkCmdBlitImage, alpha included. VRAM alpha is the PSX mask/STP bit, 0 on most pixels, and AMD's compositor honours it even with an OPAQUE compositeAlpha: parts of the window went see-through (8x8 black/white blocks of whatever sat behind it). Reported in #411. vk_renderer_present_vram/_wide now draw the displayed rect with a fullscreen triangle whose fragment shader writes alpha = 1 (new present.vert/.frag). The pass is self-contained and created lazily; if any of it fails to build, presents fall back to the old blit. Its render pass ends in TRANSFER_DST_OPTIMAL so finish_present (OSD + present barrier) is unchanged. Wide surfaces gain SAMPLED usage for it. Checked on an RX 7900 XT: intro/logo screens render correctly, no new validation-layer messages. Most of this was written by Claude Opus 5.5; I reviewed and tested it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
10 lines
363 B
GLSL
10 lines
363 B
GLSL
#version 450
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/* Fullscreen triangle for the swapchain present pass. The viewport is set to
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* the letterbox rect, so v_uv [0,1] spans exactly the displayed picture. */
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layout(location = 0) out vec2 v_uv;
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void main() {
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vec2 p = vec2(float((gl_VertexIndex << 1) & 2), float(gl_VertexIndex & 2));
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v_uv = p;
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gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0);
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}
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