PR

Author: chinmaygarde

impeller/toolkit/glvk/trampoline.cc

@@ -251,12 +251,10 @@ bool Trampoline::BlitTextureOpenGLToVulkan(
   };
 
   static constexpr const VertexData kVertData[] = {
-      {Point{-1, -1}, Point{0, 0}},  //
-      {Point{-1, +1}, Point{0, 1}},  //
-      {Point{+1, +1}, Point{1, 1}},  //
-      {Point{+1, +1}, Point{1, 1}},  //
-      {Point{+1, -1}, Point{1, 0}},  //
-      {Point{-1, -1}, Point{0, 0}},  //
+      {Point{-1, -1}, Point{0, 0}},  // bottom left
+      {Point{-1, +1}, Point{0, 1}},  // top left
+      {Point{+1, +1}, Point{1, 1}},  // top right
+      {Point{+1, -1}, Point{1, 0}},  // bottom right
   };
 
   // This is tedious but we assume no vertex array objects (VAO) are available
@@ -283,7 +281,7 @@ bool Trampoline::BlitTextureOpenGLToVulkan(
   gl.UniformMatrix4fv(st_transformation_location_, 1u, GL_FALSE,
                       reinterpret_cast<GLfloat*>(&gl_st_transformation));
 
-  gl.DrawArrays(GL_TRIANGLES, 0, 6);
+  gl.DrawArrays(GL_TRIANGLE_FAN, 0, 4);
 
   gl.UseProgram(GL_NONE);