save code

shaders/texture_loading/glsl/bg.frag

@@ -0,0 +1,11 @@
+#version 450
+
+layout(binding = 0) uniform sampler2D backgroundTexture; // Binding 0
+
+layout(location = 0) in vec2 inUV;
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    //outColor = texture(backgroundTexture, inUV);
+    outColor = vec4(1.0, 0.0, 0.0, 1.0); // 输出红色
+}

shaders/texture_loading/glsl/bg.vert

@@ -0,0 +1,29 @@
+#version 450
+
+// 在没有顶点缓冲区的情况下，通过顶点ID生成全屏 quad
+// 顶点ID: 0=(-1,-1), 1=(1,-1), 2=(-1,1), 3=(1,1)
+out gl_PerVertex {
+    vec4 gl_Position;
+};
+
+layout(location = 0) out vec2 outUV;
+
+void main() {
+    vec2 pos;
+    vec2 uv;
+    if (gl_VertexIndex == 0) {
+        pos = vec2(-1.0, -1.0);
+        uv = vec2(0.0, 0.0);
+    } else if (gl_VertexIndex == 1) {
+        pos = vec2(1.0, -1.0);
+        uv = vec2(1.0, 0.0);
+    } else if (gl_VertexIndex == 2) {
+        pos = vec2(-1.0, 1.0);
+        uv = vec2(0.0, 1.0);
+    } else { // gl_VertexIndex == 3
+        pos = vec2(1.0, 1.0);
+        uv = vec2(1.0, 1.0);
+    }
+    gl_Position = vec4(pos, 0.0, 1.0);
+    outUV = uv;
+}