diff --git a/src/xenia/gpu/gl4/blitter.cc b/src/xenia/gpu/gl4/blitter.cc
index 575c40b77..c20ba6d41 100644
--- a/src/xenia/gpu/gl4/blitter.cc
+++ b/src/xenia/gpu/gl4/blitter.cc
@@ -52,7 +52,6 @@ struct VertexData { \n\
   const std::string vs_source = header +
                                 "\n\
 layout(location = 0) uniform vec4 src_uv; \n\
-layout(location = 1) uniform vec4 dest_rect; \n\
 out gl_PerVertex { \n\
   vec4 gl_Position; \n\
   float gl_PointSize; \n\
@@ -229,7 +228,8 @@ void Blitter::Draw(GLuint src_texture, Rect2D src_rect, Rect2D dest_rect,
       break;
   }
 
-  glViewport(dest_rect.x, dest_rect.y, dest_rect.width, dest_rect.height);
+  glViewportIndexedf(0, GLfloat(dest_rect.x), GLfloat(dest_rect.y),
+                     GLfloat(dest_rect.width), GLfloat(dest_rect.height));
 
   // TODO(benvanik): avoid this?
   GLint src_texture_width;
@@ -242,8 +242,6 @@ void Blitter::Draw(GLuint src_texture, Rect2D src_rect, Rect2D dest_rect,
                      src_rect.y / float(src_texture_height),
                      src_rect.width / float(src_texture_width),
                      src_rect.height / float(src_texture_height));
-  glProgramUniform4f(vertex_program_, 1, float(dest_rect.x), float(dest_rect.y),
-                     float(dest_rect.width), float(dest_rect.height));
 
   // Useful for seeing the entire framebuffer/etc:
   // glProgramUniform4f(vertex_program_, 0, 0.0f, 0.0f, 1.0f, 1.0f);
diff --git a/src/xenia/gpu/gl4/command_processor.cc b/src/xenia/gpu/gl4/command_processor.cc
index dc1333cbb..10a38ea14 100644
--- a/src/xenia/gpu/gl4/command_processor.cc
+++ b/src/xenia/gpu/gl4/command_processor.cc
@@ -2669,22 +2669,22 @@ bool CommandProcessor::IssueCopy() {
   assert_true(fetch->size == 6);
   const uint8_t* vertex_addr = membase_ + (fetch->address << 2);
   trace_writer_.WriteMemoryRead(fetch->address << 2, fetch->size * 4);
-  int32_t dest_min_x = int32_t(std::ceilf(std::min(
+  int32_t dest_min_x = int32_t((std::min(
       std::min(
           GpuSwap(poly::load<float>(vertex_addr + 0), Endian(fetch->endian)),
           GpuSwap(poly::load<float>(vertex_addr + 8), Endian(fetch->endian))),
       GpuSwap(poly::load<float>(vertex_addr + 16), Endian(fetch->endian)))));
-  int32_t dest_max_x = int32_t(std::ceilf(std::max(
+  int32_t dest_max_x = int32_t((std::max(
       std::max(
           GpuSwap(poly::load<float>(vertex_addr + 0), Endian(fetch->endian)),
           GpuSwap(poly::load<float>(vertex_addr + 8), Endian(fetch->endian))),
       GpuSwap(poly::load<float>(vertex_addr + 16), Endian(fetch->endian)))));
-  int32_t dest_min_y = int32_t(std::ceilf(std::min(
+  int32_t dest_min_y = int32_t((std::min(
       std::min(
           GpuSwap(poly::load<float>(vertex_addr + 4), Endian(fetch->endian)),
           GpuSwap(poly::load<float>(vertex_addr + 12), Endian(fetch->endian))),
       GpuSwap(poly::load<float>(vertex_addr + 20), Endian(fetch->endian)))));
-  int32_t dest_max_y = int32_t(std::ceilf(std::max(
+  int32_t dest_max_y = int32_t((std::max(
       std::max(
           GpuSwap(poly::load<float>(vertex_addr + 4), Endian(fetch->endian)),
           GpuSwap(poly::load<float>(vertex_addr + 12), Endian(fetch->endian))),
diff --git a/src/xenia/gpu/gl4/gl4_shader.cc b/src/xenia/gpu/gl4/gl4_shader.cc
index e9fb2b3dd..bdf6f4ec3 100644
--- a/src/xenia/gpu/gl4/gl4_shader.cc
+++ b/src/xenia/gpu/gl4/gl4_shader.cc
@@ -46,6 +46,7 @@ std::string GL4Shader::GetHeader() {
       "#extension GL_ARB_shader_draw_parameters : require\n"
       "#extension GL_ARB_shader_storage_buffer_object : require\n"
       "#extension GL_ARB_shading_language_420pack : require\n"
+      "#extension GL_ARB_fragment_coord_conventions : require\n"
       "#define FLT_MAX 3.402823466e+38\n"
       "precision highp float;\n"
       "precision highp int;\n"
@@ -247,7 +248,7 @@ bool GL4Shader::PreparePixelShader(
 
   std::string source =
       GetHeader() +
-      "layout(origin_upper_left) in vec4 gl_FragCoord;\n"
+      "layout(origin_upper_left, pixel_center_integer) in vec4 gl_FragCoord;\n"
       "layout(location = 0) flat in uint draw_id;\n"
       "layout(location = 1) in VertexData vtx;\n"
       "layout(location = 0) out vec4 oC[4];\n"