Fix background render error when render to RT

packages/core/src/RenderPipeline/BasicRenderPipeline.ts

@@ -175,7 +175,7 @@
       if (background.mode === BackgroundMode.Sky) {
         background.sky._render(context);
       } else if (background.mode === BackgroundMode.Texture && background.texture) {
-        this._drawBackgroundTexture(engine, background);
+        this._drawBackgroundTexture(camera, background);
       }
     }
 
@@ -300,7 +300,8 @@
     }
   }
 
-  private _drawBackgroundTexture(engine: Engine, background: Background) {
+  private _drawBackgroundTexture(camera: Camera, background: Background) {
+    const engine = camera.engine;
     const rhi = engine._hardwareRenderer;
     const { canvas } = engine;
     const { _material: material, _mesh: mesh } = background;
@@ -317,6 +318,7 @@
     const program = pass._getShaderProgram(engine, Shader._compileMacros);
     program.bind();
     program.uploadAll(program.materialUniformBlock, material.shaderData);
+    program.uploadAll(program.cameraUniformBlock, camera.shaderData);
     program.uploadUnGroupTextures();
 
     (pass._renderState || material.renderState)._applyStates(

packages/core/src/shaderlib/extra/background-texture.vs.glsl

@@ -1,9 +1,11 @@
 attribute vec3 POSITION;
 attribute vec2 TEXCOORD_0;
-
 varying vec2 v_uv;
+uniform vec4 camera_ProjectionParams;
 
 void main() {
   gl_Position = vec4(POSITION, 1.0);
+  gl_Position.y *= camera_ProjectionParams.x;
+
   v_uv = TEXCOORD_0;
 }