From 5edf24b51025fef4d78e5f9d4038267e472b2f55 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Fri, 12 Jul 2019 02:00:04 -0300
Subject: [PATCH] gl_state: Add support for glBindImageTextures

---
 src/video_core/renderer_opengl/gl_state.cpp | 21 +++++++++++++++++++++
 src/video_core/renderer_opengl/gl_state.h   |  3 +++
 2 files changed, 24 insertions(+)

diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp
index f4777d0b07..a38f881826 100644
--- a/src/video_core/renderer_opengl/gl_state.cpp
+++ b/src/video_core/renderer_opengl/gl_state.cpp
@@ -545,6 +545,26 @@ void OpenGLState::ApplySamplers() const {
     }
 }
 
+void OpenGLState::ApplyImages() const {
+    bool has_delta{};
+    std::size_t first{};
+    std::size_t last{};
+    for (std::size_t i = 0; i < std::size(images); ++i) {
+        if (!UpdateValue(cur_state.images[i], images[i])) {
+            continue;
+        }
+        if (!has_delta) {
+            first = i;
+            has_delta = true;
+        }
+        last = i;
+    }
+    if (has_delta) {
+        glBindImageTextures(static_cast<GLuint>(first), static_cast<GLsizei>(last - first + 1),
+                            images.data() + first);
+    }
+}
+
 void OpenGLState::Apply() {
     MICROPROFILE_SCOPE(OpenGL_State);
     ApplyFramebufferState();
@@ -576,6 +596,7 @@ void OpenGLState::Apply() {
     ApplyLogicOp();
     ApplyTextures();
     ApplySamplers();
+    ApplyImages();
     if (dirty.polygon_offset) {
         ApplyPolygonOffset();
         dirty.polygon_offset = false;
diff --git a/src/video_core/renderer_opengl/gl_state.h b/src/video_core/renderer_opengl/gl_state.h
index fdf9a8a12b..9748d60e2b 100644
--- a/src/video_core/renderer_opengl/gl_state.h
+++ b/src/video_core/renderer_opengl/gl_state.h
@@ -134,6 +134,8 @@ public:
     };
     std::array<TextureUnit, Tegra::Engines::Maxwell3D::Regs::NumTextureSamplers> texture_units;
 
+    std::array<GLuint, Tegra::Engines::Maxwell3D::Regs::NumImages> images{};
+
     struct {
         GLuint read_framebuffer; // GL_READ_FRAMEBUFFER_BINDING
         GLuint draw_framebuffer; // GL_DRAW_FRAMEBUFFER_BINDING
@@ -220,6 +222,7 @@ public:
     void ApplyLogicOp() const;
     void ApplyTextures() const;
     void ApplySamplers() const;
+    void ApplyImages() const;
     void ApplyDepthClamp() const;
     void ApplyPolygonOffset() const;
     void ApplyAlphaTest() const;