mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 18:25:35 -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>
15 lines
677 B
GLSL
15 lines
677 B
GLSL
#version 450
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/* Swapchain present: sample the displayed VRAM rect and write it OPAQUE.
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* VRAM alpha carries the PSX mask/STP bit (0 on most pixels); copying it into
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* the swapchain with a transfer blit let AMD's compositor treat the window as
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* partly transparent (desktop showing through as black/white blocks). */
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layout(location = 0) in vec2 v_uv;
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layout(location = 0) out vec4 o_col;
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layout(set = 0, binding = 0) uniform sampler2D u_src;
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layout(push_constant) uniform PC {
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vec4 u_src_rect; /* displayed region in normalized src coords: x0,y0,x1,y1 */
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} pc;
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void main() {
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o_col = vec4(texture(u_src, mix(pc.u_src_rect.xy, pc.u_src_rect.zw, v_uv)).rgb, 1.0);
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}
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