big slow change: prebuilt shaders (SPIR-V/Metal), core gui reflow, docs, web + snapshot refresh

1 files changed, 49 insertions, 0 deletions

diff --git a/shaders/prebuilt/image.vert.glsl b/shaders/prebuilt/image.vert.glsl
new file mode 100644
index 00000000..04196ce4
--- /dev/null
+++ b/shaders/prebuilt/image.vert.glsl
@@ -0,0 +1,49 @@
+#version 450
+
+// One instance per Surface image attachment. The CPU has already converted
+// the pane's cell rectangle and the aspect-preserving contain fit to NDC.
+layout(location = 0) in vec4 a_rect;    // x0, y0, x1, y1
+layout(location = 1) in vec4 a_uv_rect; // u0, v0, u1, v1
+layout(location = 2) in vec4 a_panel_rect;
+layout(location = 3) in vec4 a_present_rect;
+layout(location = 4) in uvec4 a_effect;
+
+layout(location = 0) out vec2 v_uv;
+layout(location = 1) out vec2 v_panel_uv;
+layout(location = 2) flat out uvec4 v_effect;
+
+void main() {
+    vec2 pos;
+    int corner = gl_VertexIndex % 6;
+    if (corner == 0) {
+        pos = vec2(a_rect.x, a_rect.y);
+        v_uv = vec2(a_uv_rect.x, a_uv_rect.y);
+    } else if (corner == 1) {
+        pos = vec2(a_rect.z, a_rect.y);
+        v_uv = vec2(a_uv_rect.z, a_uv_rect.y);
+    } else if (corner == 2) {
+        pos = vec2(a_rect.z, a_rect.w);
+        v_uv = vec2(a_uv_rect.z, a_uv_rect.w);
+    } else if (corner == 3) {
+        pos = vec2(a_rect.x, a_rect.y);
+        v_uv = vec2(a_uv_rect.x, a_uv_rect.y);
+    } else if (corner == 4) {
+        pos = vec2(a_rect.z, a_rect.w);
+        v_uv = vec2(a_uv_rect.z, a_uv_rect.w);
+    } else {
+        pos = vec2(a_rect.x, a_rect.w);
+        v_uv = vec2(a_uv_rect.x, a_uv_rect.w);
+    }
+    v_panel_uv = v_uv;
+    uint effect = a_effect.x & 0x7fffffffu;
+    if (effect != 0u) {
+        vec2 panel_size = a_panel_rect.zw - a_panel_rect.xy;
+        panel_size.x = abs(panel_size.x) < 0.000001 ? 0.000001 : panel_size.x;
+        panel_size.y = abs(panel_size.y) < 0.000001 ? -0.000001 : panel_size.y;
+        v_panel_uv = (pos - a_panel_rect.xy) / panel_size;
+        if (effect == 1u || effect == 2u || effect == 5u)
+            pos = mix(a_present_rect.xy, a_present_rect.zw, v_panel_uv);
+    }
+    v_effect = a_effect;
+    gl_Position = vec4(pos, 0.0, 1.0);
+}