From 410d44ce0577dd81fd1debda0fd14b0011238f10 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Tue, 19 Nov 2019 23:55:17 -0300
Subject: gl_device: Deduce indexing bug from device instead of heuristic

The heuristic to detect AMD's driver was not working properly since it
also included Intel. Instead of using heuristics to detect it, compare
the GL_VENDOR string.
---
 src/video_core/renderer_opengl/gl_device.cpp | 49 ++--------------------------
 src/video_core/renderer_opengl/gl_device.h   |  1 -
 2 files changed, 2 insertions(+), 48 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_device.cpp b/src/video_core/renderer_opengl/gl_device.cpp
index a95bd4b2c..413d8546b 100644
--- a/src/video_core/renderer_opengl/gl_device.cpp
+++ b/src/video_core/renderer_opengl/gl_device.cpp
@@ -137,6 +137,7 @@ Device::Device() : base_bindings{BuildBaseBindings()} {
     const std::vector extensions = GetExtensions();
 
     const bool is_nvidia = vendor == "NVIDIA Corporation";
+    const bool is_amd = vendor == "ATI Technologies Inc.";
     const bool is_intel = vendor == "Intel";
 
     uniform_buffer_alignment = GetInteger<std::size_t>(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
@@ -149,7 +150,7 @@ Device::Device() : base_bindings{BuildBaseBindings()} {
     has_vertex_viewport_layer = GLAD_GL_ARB_shader_viewport_layer_array;
     has_image_load_formatted = HasExtension(extensions, "GL_EXT_shader_image_load_formatted");
     has_variable_aoffi = TestVariableAoffi();
-    has_component_indexing_bug = TestComponentIndexingBug();
+    has_component_indexing_bug = is_amd;
     has_precise_bug = TestPreciseBug();
     has_broken_compute = is_intel;
     has_fast_buffer_sub_data = is_nvidia;
@@ -184,52 +185,6 @@ void main() {
 })");
 }
 
-bool Device::TestComponentIndexingBug() {
-    const GLchar* COMPONENT_TEST = R"(#version 430 core
-layout (std430, binding = 0) buffer OutputBuffer {
-    uint output_value;
-};
-layout (std140, binding = 0) uniform InputBuffer {
-    uvec4 input_value[4096];
-};
-layout (location = 0) uniform uint idx;
-void main() {
-    output_value = input_value[idx >> 2][idx & 3];
-})";
-    const GLuint shader{glCreateShaderProgramv(GL_VERTEX_SHADER, 1, &COMPONENT_TEST)};
-    SCOPE_EXIT({ glDeleteProgram(shader); });
-    glUseProgram(shader);
-
-    OGLVertexArray vao;
-    vao.Create();
-    glBindVertexArray(vao.handle);
-
-    constexpr std::array<GLuint, 8> values{0, 0, 0, 0, 0x1236327, 0x985482, 0x872753, 0x2378432};
-    OGLBuffer ubo;
-    ubo.Create();
-    glNamedBufferData(ubo.handle, sizeof(values), values.data(), GL_STATIC_DRAW);
-    glBindBufferBase(GL_UNIFORM_BUFFER, 0, ubo.handle);
-
-    OGLBuffer ssbo;
-    ssbo.Create();
-    glNamedBufferStorage(ssbo.handle, sizeof(GLuint), nullptr, GL_CLIENT_STORAGE_BIT);
-
-    for (GLuint index = 4; index < 8; ++index) {
-        glInvalidateBufferData(ssbo.handle);
-        glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, ssbo.handle);
-
-        glProgramUniform1ui(shader, 0, index);
-        glDrawArrays(GL_POINTS, 0, 1);
-
-        GLuint result;
-        glGetNamedBufferSubData(ssbo.handle, 0, sizeof(result), &result);
-        if (result != values.at(index)) {
-            return true;
-        }
-    }
-    return false;
-}
-
 bool Device::TestPreciseBug() {
     return !TestProgram(R"(#version 430 core
 in vec3 coords;
diff --git a/src/video_core/renderer_opengl/gl_device.h b/src/video_core/renderer_opengl/gl_device.h
index 5433815b9..d73b099d0 100644
--- a/src/video_core/renderer_opengl/gl_device.h
+++ b/src/video_core/renderer_opengl/gl_device.h
@@ -86,7 +86,6 @@ public:
 
 private:
     static bool TestVariableAoffi();
-    static bool TestComponentIndexingBug();
     static bool TestPreciseBug();
 
     std::array<BaseBindings, Tegra::Engines::MaxShaderTypes> base_bindings;
-- 
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