diff --git a/src/CRE/post_process.cpp b/src/CRE/post_process.cpp
index aab3d995..0992f61a 100644
--- a/src/CRE/post_process.cpp
+++ b/src/CRE/post_process.cpp
@@ -194,12 +194,13 @@ void post_process::apply(camera* cam, texture* light_proj_tex, int32_t npr_param
 
     get_frame_texture(rend_texture.GetColorTex(), POST_PROCESS_FRAME_TEXTURE_PRE_PP);
 
-    blur->get_blur(&rend_texture);
+    blur->downsample(&rend_texture);
+    blur->get_blur();
     exposure->get_exposure(cam, render_width, render_height, reset_exposure,
-        blur->tex[4].GetColorTex(), blur->tex[2].GetColorTex());
+        blur->reduce_texture[4].GetColorTex(), blur->reduce_texture[2].GetColorTex());
     tone_map->apply(&rend_texture, light_proj_tex, (texture*)(aet_back ? aet_back_tex : 0),
         &rend_texture, &buf_texture, /* sss_contour_texture,*/
-        blur->tex[0].GetColorTex(), exposure->exposure.GetColorTex(), npr_param, this);
+        blur->reduce_texture[0].GetColorTex(), exposure->exposure.GetColorTex(), npr_param, this);
     if (mlaa)
         apply_mlaa(samplers, ss_alpha_mask);
 
@@ -219,7 +220,8 @@ void post_process::apply(camera* cam, texture* light_proj_tex, int32_t npr_param
         gl_state_active_bind_texture_2d(0, rend_texture.GetColorTex());
         gl_state_bind_sampler(0, samplers[0]);
         shaders_ft.set(SHADER_FT_REDUCE);
-        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
     }
 
     get_frame_texture(rend_texture.GetColorTex(), POST_PROCESS_FRAME_TEXTURE_POST_PP);
@@ -234,7 +236,8 @@ void post_process::apply(camera* cam, texture* light_proj_tex, int32_t npr_param
         uniform_value[U_ALPHA_MASK] = ss_alpha_mask ? 1 : 0;
         uniform_value[U_REDUCE] = 0;
         shaders_ft.set(SHADER_FT_REDUCE);
-        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
         uniform_value[U_ALPHA_MASK] = 0;
     }
     else {
@@ -265,7 +268,8 @@ void post_process::apply(camera* cam, texture* light_proj_tex, int32_t npr_param
         }
 
         shaders_ft.set(SHADER_FT_MAGNIFY);
-        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+        RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
     }
     shader::unbind();
 
@@ -280,7 +284,8 @@ void post_process::apply_mlaa(GLuint* samplers, int32_t ss_alpha_mask) {
     gl_state_bind_sampler(0, samplers[1]);
     uniform_value[U_MLAA] = 0;
     shaders_ft.set(SHADER_FT_MLAA);
-    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
 
     temp_buffer.Bind();
     gl_state_active_bind_texture_2d(0, mlaa_buffer.GetColorTex());
@@ -290,7 +295,8 @@ void post_process::apply_mlaa(GLuint* samplers, int32_t ss_alpha_mask) {
     uniform_value[U_MLAA] = 1;
     uniform_value[U_MLAA_SEARCH] = 2;
     shaders_ft.set(SHADER_FT_MLAA);
-    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
 
     buf_texture.Bind();
     gl_state_active_bind_texture_2d(0, rend_texture.GetColorTex());
@@ -299,7 +305,8 @@ void post_process::apply_mlaa(GLuint* samplers, int32_t ss_alpha_mask) {
     uniform_value[U_MLAA] = 2;
     uniform_value[U_ALPHA_MASK] = ss_alpha_mask ? 1 : 0;
     shaders_ft.set(SHADER_FT_MLAA);
-    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height);
+    RenderTexture::DrawQuad(&shaders_ft, render_width, render_height,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
     uniform_value[U_ALPHA_MASK] = 0;
     gl_state_active_bind_texture_2d(0, 0);
     gl_state_active_bind_texture_2d(1, 0);
@@ -821,7 +828,8 @@ void post_process::get_frame_texture(GLuint tex, post_process_frame_texture_type
             glViewport(0, 0, dst_tex->width, dst_tex->height);
             uniform_value[U_REDUCE] = 0;
             shaders_ft.set(SHADER_FT_REDUCE);
-            RenderTexture::DrawQuad(&shaders_ft, dst_tex->width, dst_tex->height);
+            RenderTexture::DrawQuad(&shaders_ft, dst_tex->width, dst_tex->height,
+                1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
             gl_state_bind_framebuffer(0);
         }
     }
diff --git a/src/CRE/post_process/blur.cpp b/src/CRE/post_process/blur.cpp
index c1b92bdd..7ececda4 100644
--- a/src/CRE/post_process/blur.cpp
+++ b/src/CRE/post_process/blur.cpp
@@ -20,12 +20,19 @@ static void post_process_blur_radius_calculate_gaussian_kernel(float_t* gaussian
 
 post_process_blur::post_process_blur() : data(),
 width(), height(), width_down(), height_down(), tex_down(), count_down() {
-    tex[0].Init(256, 144, 0, GL_RGBA16F, 0);
-    tex[1].Init(128, 72, 0, GL_RGBA16F, 0);
-    tex[2].Init(64, 36, 0, GL_RGBA16F, 0);
-    tex[3].Init(32, 18, 0, GL_RGBA16F, 0);
-    tex[4].Init(8, 8, 0, GL_RGBA16F, 0);
-    tex[5].Init(256, 144, 0, GL_RGBA16F, 0);
+    reduce_width[0] = 256;
+    reduce_height[0] = 144;
+    reduce_width[1] = 128;
+    reduce_height[1] = 72;
+    reduce_width[2] = 64;
+    reduce_height[2] = 36;
+    reduce_width[3] = 32;
+    reduce_height[3] = 18;
+    reduce_width[4] = 8;
+    reduce_height[4] = 8;
+    for (int32_t i = 0; i < 5; i++)
+        reduce_texture[i].Init(reduce_width[i], reduce_height[i], 0, GL_RGBA16F, 0);
+    downsample_texture.Init(reduce_width[0], reduce_height[0], 0, GL_RGBA16F, 0);
     gaussian_coef_ubo.Create(sizeof(gaussian_coef_shader_data));
 }
 
@@ -41,20 +48,7 @@ post_process_blur:: ~post_process_blur() {
     free_def(width_down);
 }
 
-void post_process_blur::get_blur(RenderTexture* rt) {
-    uniform_value[U_ALPHA_MASK] = 0;
-
-    vec3 intensity = data.intensity;
-    vec3* gauss = data.gauss;
-
-    gaussian_coef_shader_data gaussian_coef = {};
-    for (int32_t i = 0; i < POST_PROCESS_BLUR_GAUSSIAN_KERNEL_SIZE && i < 8; i++) {
-        vec3 coef = gauss[i] * intensity;
-        gaussian_coef.g_coef[i] = { coef.x, coef.y, coef.z, 0.0f };
-    }
-
-    gaussian_coef_ubo.WriteMemory(gaussian_coef);
-
+void post_process_blur::downsample(RenderTexture* rt) {
     int32_t i = 0;
     if (count_down > 0) {
         uniform_value[U_REDUCE] = 1;
@@ -63,7 +57,8 @@ void post_process_blur::get_blur(RenderTexture* rt) {
             glViewport(0, 0, width_down[i], height_down[i]);
             tex_down[i].Bind();
             gl_state_active_bind_texture_2d(0, (i ? tex_down[i - 1] : *rt).GetColorTex());
-            RenderTexture::DrawQuad(&shaders_ft, width_down[i], height_down[i]);
+            RenderTexture::DrawQuad(&shaders_ft, width_down[i], height_down[i],
+                1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
         }
         i--;
     }
@@ -71,114 +66,91 @@ void post_process_blur::get_blur(RenderTexture* rt) {
     uniform_value[U_REDUCE] = 3;
     shaders_ft.set(SHADER_FT_REDUCE);
 
-    glViewport(0, 0, 256, 144);
-    tex[0].Bind();
+    glViewport(0, 0, reduce_width[0], reduce_height[0]);
+    reduce_texture[0].Bind();
     gl_state_active_bind_texture_2d(0, (count_down > 0 ? tex_down[i] : *rt).GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, width, height, 1.0f, 1.0f, 1.1f, 1.1f, 1.1f, 0.0f);
+    RenderTexture::DrawQuad(&shaders_ft, width, height,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.1f, 1.1f, 1.1f, 0.0f);
 
-    uniform_value[U_GAUSS] = 1;
-    shaders_ft.set(SHADER_FT_GAUSS);
+    downsample_texture.Bind();
+    gl_state_active_bind_texture_2d(0, reduce_texture[0].GetColorTex());
+    for (int32_t i = 1; i < 5; i++) {
+        float_t scale;
+        if (i == 4) {
+            scale = 1.0f;
+            uniform_value[U_EXPOSURE] = 0;
+            shaders_ft.set(SHADER_FT_EXPOSURE);
+        }
+        else
+        {
+            scale = 0.75;
+            uniform_value[U_REDUCE] = 1;
+            shaders_ft.set(SHADER_FT_REDUCE);
+        }
 
-    glViewport(0, 0, 256, 144);
-    tex[5].Bind();
-    gl_state_active_bind_texture_2d(0, tex[0].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 256, 144, 1.0f, 1.0f,
-        data.intensity.x * 0.5f, data.intensity.y * 0.5f, data.intensity.z * 0.5f, 1.0f);
+        glViewport(0, 0, reduce_width[i], reduce_height[i]);
+        RenderTexture::DrawQuad(&shaders_ft, reduce_width[i - 1], reduce_height[i - 1],
+            1.0f, 1.0f, 0.0f, 0.0f, scale, 1.0f, 1.0f, 1.0f, 1.0f);
+        gl_state_active_bind_texture_2d(0, reduce_texture[i].GetColorTex());
+        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, reduce_width[i], reduce_height[i]);
+    }
+}
 
-    uniform_value[U_REDUCE] = 1;
-    shaders_ft.set(SHADER_FT_REDUCE);
+void post_process_blur::get_blur() {
+    uniform_value[U_ALPHA_MASK] = 0;
 
-    glViewport(0, 0, 128, 72);
-    tex[1].Bind();
-    gl_state_active_bind_texture_2d(0, tex[0].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 256, 144);
+    vec3 intensity = data.intensity;
+    vec3* gauss = data.gauss;
 
-    uniform_value[U_REDUCE] = 1;
-    shaders_ft.set(SHADER_FT_REDUCE);
+    gaussian_coef_shader_data gaussian_coef = {};
+    for (int32_t i = 0; i < POST_PROCESS_BLUR_GAUSSIAN_KERNEL_SIZE && i < 8; i++) {
+        *(vec3*)&gaussian_coef.g_coef[i] = gauss[i] * intensity;
+        gaussian_coef.g_coef[i].w = 0.0f;
+    }
 
-    glViewport(0, 0, 64, 36);
-    tex[2].Bind();
-    gl_state_active_bind_texture_2d(0, tex[1].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 128, 72);
-
-    uniform_value[U_REDUCE] = 1;
-    shaders_ft.set(SHADER_FT_REDUCE);
-
-    glViewport(0, 0, 32, 18);
-    tex[3].Bind();
-    gl_state_active_bind_texture_2d(0, tex[2].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 64, 36);
-
-    uniform_value[U_EXPOSURE] = 0;
-    shaders_ft.set(SHADER_FT_EXPOSURE);
-
-    glViewport(0, 0, 8, 8);
-    tex[4].Bind();
-    gl_state_active_bind_texture_2d(0, tex[3].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 32, 18);
+    gaussian_coef_ubo.WriteMemory(gaussian_coef);
 
     uniform_value[U_GAUSS] = 0;
     shaders_ft.set(SHADER_FT_GAUSS);
     gaussian_coef_ubo.Bind(1);
 
-    glViewport(0, 0, 128, 72);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[1].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 128, 72, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f);
-    fbo::blit(tex[0].fbos[0], tex[1].fbos[0],
-        0, 0, 128, 72,
-        0, 0, 128, 72, GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    downsample_texture.Bind();
+    for (int32_t i = 1; i < 4; i++) {
+        glViewport(0, 0, reduce_width[i], reduce_height[i]);
+        gl_state_active_bind_texture_2d(0, reduce_texture[i].GetColorTex());
+        RenderTexture::DrawQuad(&shaders_ft, reduce_width[i], reduce_height[i],
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f);
+        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, reduce_width[i], reduce_height[i]);
+    }
 
-    glViewport(0, 0, 64, 36);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[2].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 64, 36, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f);
-    fbo::blit(tex[0].fbos[0], tex[2].fbos[0],
-        0, 0, 64, 36,
-        0, 0, 64, 36, GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    for (int32_t i = 1; i < 4; i++) {
+        glViewport(0, 0, reduce_width[i], reduce_height[i]);
+        gl_state_active_bind_texture_2d(0, reduce_texture[i].GetColorTex());
+        RenderTexture::DrawQuad(&shaders_ft, reduce_width[i], reduce_height[i],
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f);
+        glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, reduce_width[i], reduce_height[i]);
+    }
 
-    glViewport(0, 0, 32, 18);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[3].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 32, 18);
-    fbo::blit(tex[0].fbos[0], tex[3].fbos[0],
-        0, 0, 32, 18,
-        0, 0, 32, 18, GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    uniform_value[U_GAUSS] = 1;
+    shaders_ft.set(SHADER_FT_GAUSS);
 
-    glViewport(0, 0, 128, 72);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[1].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 128, 72, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f);
-    fbo::blit(tex[0].fbos[0], tex[1].fbos[0],
-        0, 0, 128, 72,
-        0, 0, 128, 72, GL_COLOR_BUFFER_BIT, GL_LINEAR);
-
-    glViewport(0, 0, 64, 36);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[2].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 64, 36, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f);
-    fbo::blit(tex[0].fbos[0], tex[2].fbos[0],
-        0, 0, 64, 36,
-        0, 0, 64, 36, GL_COLOR_BUFFER_BIT, GL_LINEAR);
-
-    glViewport(0, 0, 32, 18);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[3].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 32, 18, 1.0f, 1.0f, 0.0f, 1.0f, 0.0f, 1.0f);
-    fbo::blit(tex[0].fbos[0], tex[3].fbos[0],
-        0, 0, 32, 18,
-        0, 0, 32, 18, GL_COLOR_BUFFER_BIT, GL_LINEAR);
+    glViewport(0, 0, reduce_width[0], reduce_height[0]);
+    gl_state_active_bind_texture_2d(0, reduce_texture[0].GetColorTex());
+    RenderTexture::DrawQuad(&shaders_ft, reduce_width[0], reduce_height[0],
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
+        data.intensity.x * 0.5f, data.intensity.y * 0.5f, data.intensity.z * 0.5f, 1.0f);
 
     uniform_value[U_REDUCE] = 7;
     shaders_ft.set(SHADER_FT_REDUCE);
 
-    glViewport(0, 0, 256, 144);
-    tex[0].Bind();
-    gl_state_active_bind_texture_2d(0, tex[5].GetColorTex());
-    gl_state_active_bind_texture_2d(1, tex[1].GetColorTex());
-    gl_state_active_bind_texture_2d(2, tex[2].GetColorTex());
-    gl_state_active_bind_texture_2d(3, tex[3].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 32, 18, 0.25f, 0.25f, 0.15f, 0.25f, 0.25f, 0.25f);
+    glViewport(0, 0, reduce_width[0], reduce_height[0]);
+    reduce_texture[0].Bind();
+    gl_state_active_bind_texture_2d(0, downsample_texture.GetColorTex());
+    gl_state_active_bind_texture_2d(1, reduce_texture[1].GetColorTex());
+    gl_state_active_bind_texture_2d(2, reduce_texture[2].GetColorTex());
+    gl_state_active_bind_texture_2d(3, reduce_texture[3].GetColorTex());
+    RenderTexture::DrawQuad(&shaders_ft, reduce_width[3], reduce_height[3],
+        1.0f, 1.0f, 0.0f, 0.0f, 0.25f, 0.15f, 0.25f, 0.25f, 0.25f);
 }
 
 void post_process_blur::init_fbo(int32_t width, int32_t height) {
diff --git a/src/CRE/post_process/blur.hpp b/src/CRE/post_process/blur.hpp
index da58c858..eecf3231 100644
--- a/src/CRE/post_process/blur.hpp
+++ b/src/CRE/post_process/blur.hpp
@@ -23,7 +23,10 @@ struct post_process_blur {
     post_process_blur_data data;
     int32_t width;
     int32_t height;
-    RenderTexture tex[6];
+    RenderTexture reduce_texture[5];
+    RenderTexture downsample_texture;
+    int32_t reduce_width[5];
+    int32_t reduce_height[5];
     int32_t* width_down;
     int32_t* height_down;
     RenderTexture* tex_down;
@@ -33,7 +36,8 @@ struct post_process_blur {
     post_process_blur();
     ~post_process_blur();
 
-    void get_blur(RenderTexture* rt);
+    void downsample(RenderTexture* rt);
+    void get_blur();
     void init_fbo(int32_t width, int32_t height);
     void initialize_data(const vec3& radius, const vec3& intensity);
 
diff --git a/src/CRE/post_process/exposure.cpp b/src/CRE/post_process/exposure.cpp
index 4579b02e..74874108 100644
--- a/src/CRE/post_process/exposure.cpp
+++ b/src/CRE/post_process/exposure.cpp
@@ -174,7 +174,8 @@ void post_process_exposure::get_exposure(camera* cam, int32_t render_width,
         exposure_measure_ubo.Bind(1);
         gl_state_active_bind_texture_2d(0, in_tex_0);
         gl_state_active_bind_texture_2d(1, in_tex_1);
-        RenderTexture::DrawQuad(&shaders_ft, reset_exposure ? 32 : 1, 1);
+        RenderTexture::DrawQuad(&shaders_ft, reset_exposure ? 32 : 1, 1,
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
         exposure_history_counter++;
         exposure_history_counter %= 32;
     }
@@ -184,7 +185,8 @@ void post_process_exposure::get_exposure(camera* cam, int32_t render_width,
     uniform_value[U_EXPOSURE] = 2;
     shaders_ft.set(SHADER_FT_EXPOSURE);
     gl_state_active_bind_texture_2d(0, exposure_history.GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 1, 1);
+    RenderTexture::DrawQuad(&shaders_ft, 1, 1,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
 }
 
 void post_process_exposure::get_exposure_chara_data(void* pp_data, camera* cam) {
diff --git a/src/CRE/render_manager.cpp b/src/CRE/render_manager.cpp
index 8de5ea8e..868512a8 100644
--- a/src/CRE/render_manager.cpp
+++ b/src/CRE/render_manager.cpp
@@ -1197,7 +1197,8 @@ static void draw_pass_sss_contour(render_context* rctx, post_process* pp) {
 
     shaders_ft.set(SHADER_FT_CONTOUR);
     rctx->contour_coef_ubo.Bind(2);
-    RenderTexture::DrawQuad(&shaders_ft, pp->render_width, pp->render_height);
+    RenderTexture::DrawQuad(&shaders_ft, pp->render_width, pp->render_height,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f);
 }
 
 static void draw_pass_sss_filter_calc_coef(double_t a1, size_t a2, double_t a3, size_t a4,
@@ -1305,14 +1306,16 @@ static void draw_pass_sss_filter(render_context* rctx, sss_data* sss) {
         uniform_value[U_REDUCE] = 0;
         shaders_ft.set(SHADER_FT_REDUCE);
         gl_state_bind_texture_2d(pp->rend_texture.GetColorTex());
-        RenderTexture::DrawQuad(&shaders_ft, 640, 360, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
+        RenderTexture::DrawQuad(&shaders_ft, 640, 360,
+            1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
     }
     sss->textures[2].Bind();
     glViewport(0, 0, 320, 180);
     uniform_value[U_SSS_FILTER] = 0;
     shaders_ft.set(SHADER_FT_SSS_FILT);
     gl_state_bind_texture_2d(sss->textures[0].GetColorTex());
-    RenderTexture::DrawQuad(&shaders_ft, 640, 360, 1.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
+    RenderTexture::DrawQuad(&shaders_ft, 640, 360,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f, 1.0f, 0.0f);
 
     sss_filter_gaussian_coef_shader_data shader_data = {};
     shader_data.g_param = { (float_t)(sss_count - 1), 0.0f, 1.0f, 1.0f };
@@ -1330,7 +1333,8 @@ static void draw_pass_sss_filter(render_context* rctx, sss_data* sss) {
     shaders_ft.set(SHADER_FT_SSS_FILT);
     gl_state_bind_texture_2d(sss->textures[2].GetColorTex());
     rctx->sss_filter_gaussian_coef_ubo.Bind(1);
-    RenderTexture::DrawQuad(&shaders_ft, 320, 180, 1.0f, 1.0f, 1.0f, 0.96f, 1.0f, 0.0f);
+    RenderTexture::DrawQuad(&shaders_ft, 320, 180,
+        1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.96f, 1.0f, 0.0f);
     gl_state_bind_texture_2d(0);
 }
 
diff --git a/src/CRE/render_texture.cpp b/src/CRE/render_texture.cpp
index 6008f4ff..1baeac51 100644
--- a/src/CRE/render_texture.cpp
+++ b/src/CRE/render_texture.cpp
@@ -146,14 +146,18 @@ void RenderTexture::DrawCustom() {
 }
 
 void RenderTexture::DrawQuad(shader_set_data* set, int32_t width, int32_t height,
-    float_t scale_x, float_t scale_y, float_t param_x, float_t param_y, float_t param_z, float_t param_w) {
+    float_t s0, float_t t0, float_t s1, float_t t1, float_t scale,
+    float_t param_x, float_t param_y, float_t param_z, float_t param_w) {
     extern render_context* rctx_ptr;
 
+    s0 -= s1;
+    t0 -= t1;
+
     float_t w = (float_t)max_def(width, 1);
     float_t h = (float_t)max_def(height, 1);
     quad_shader_data quad = {};
-    quad.g_texcoord_modifier = { 0.5f, 0.5f, 0.5f, 0.5f }; // x * 0.5 + 0.5
-    quad.g_texel_size = { scale_x / w, scale_y / h, w, h };
+    quad.g_texcoord_modifier = { 0.5f * s0, 0.5f * t0, 0.5f * s0 + s1, 0.5f * t0 + t1 }; // x * 0.5 * y0 + 0.5 * y0 + y1
+    quad.g_texel_size = { scale / w, scale / h, w, h };
     quad.g_color = { param_x, param_y, param_z, param_w };
     quad.g_texture_lod = 0.0f;
 
diff --git a/src/CRE/render_texture.hpp b/src/CRE/render_texture.hpp
index 542cd50f..e0fb034b 100644
--- a/src/CRE/render_texture.hpp
+++ b/src/CRE/render_texture.hpp
@@ -30,9 +30,9 @@ struct RenderTexture {
 
     static void Draw(shader_set_data* set);
     static void DrawCustom();
-    static void DrawQuad(shader_set_data* set,
-        int32_t width, int32_t height, float_t scale_x = 1.0f, float_t scale_y = 1.0f,
-        float_t param_x = 1.0f, float_t param_y = 1.0f, float_t param_z = 1.0f, float_t param_w = 1.0f);
+    static void DrawQuad(shader_set_data* set, int32_t width, int32_t height,
+        float_t s0, float_t t0, float_t s1, float_t t1, float_t scale,
+        float_t param_x, float_t param_y, float_t param_z, float_t param_w);
 
     inline GLuint GetColorTex() {
         return color_texture->tex;