From 013b6891531b37e0f882b8b88d404feb63370617 Mon Sep 17 00:00:00 2001
From: Feng Chen <vonchenplus@gmail.com>
Date: Thu, 5 Jan 2023 12:28:48 +0800
Subject: video_core: Implement opengl/vulkan draw_texture

---
 .../renderer_opengl/gl_shader_manager.cpp          | 121 +++++++++++++++++++++
 1 file changed, 121 insertions(+)

(limited to 'src/video_core/renderer_opengl/gl_shader_manager.cpp')

diff --git a/src/video_core/renderer_opengl/gl_shader_manager.cpp b/src/video_core/renderer_opengl/gl_shader_manager.cpp
index d9c29d8b7..98841ae65 100644
--- a/src/video_core/renderer_opengl/gl_shader_manager.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_manager.cpp
@@ -1,2 +1,123 @@
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <glad/glad.h>
+
+#include "video_core/renderer_opengl/gl_shader_manager.h"
+
+namespace OpenGL {
+
+static constexpr std::array ASSEMBLY_PROGRAM_ENUMS{
+    GL_VERTEX_PROGRAM_NV,   GL_TESS_CONTROL_PROGRAM_NV, GL_TESS_EVALUATION_PROGRAM_NV,
+    GL_GEOMETRY_PROGRAM_NV, GL_FRAGMENT_PROGRAM_NV,
+};
+
+ProgramManager::ProgramManager(const Device& device) {
+    glCreateProgramPipelines(1, &pipeline.handle);
+    if (device.UseAssemblyShaders()) {
+        glEnable(GL_COMPUTE_PROGRAM_NV);
+    }
+}
+
+void ProgramManager::BindComputeProgram(GLuint program) {
+    glUseProgram(program);
+    is_compute_bound = true;
+}
+
+void ProgramManager::BindComputeAssemblyProgram(GLuint program) {
+    if (current_assembly_compute_program != program) {
+        current_assembly_compute_program = program;
+        glBindProgramARB(GL_COMPUTE_PROGRAM_NV, program);
+    }
+    UnbindPipeline();
+}
+
+void ProgramManager::BindSourcePrograms(std::span<const OGLProgram, NUM_STAGES> programs) {
+    static constexpr std::array<GLenum, 5> stage_enums{
+        GL_VERTEX_SHADER_BIT,   GL_TESS_CONTROL_SHADER_BIT, GL_TESS_EVALUATION_SHADER_BIT,
+        GL_GEOMETRY_SHADER_BIT, GL_FRAGMENT_SHADER_BIT,
+    };
+    for (size_t stage = 0; stage < NUM_STAGES; ++stage) {
+        if (current_programs[stage] != programs[stage].handle) {
+            current_programs[stage] = programs[stage].handle;
+            glUseProgramStages(pipeline.handle, stage_enums[stage], programs[stage].handle);
+        }
+    }
+    BindPipeline();
+}
+
+void ProgramManager::BindPresentPrograms(GLuint vertex, GLuint fragment) {
+    if (current_programs[0] != vertex) {
+        current_programs[0] = vertex;
+        glUseProgramStages(pipeline.handle, GL_VERTEX_SHADER_BIT, vertex);
+    }
+    if (current_programs[4] != fragment) {
+        current_programs[4] = fragment;
+        glUseProgramStages(pipeline.handle, GL_FRAGMENT_SHADER_BIT, fragment);
+    }
+    glUseProgramStages(
+        pipeline.handle,
+        GL_TESS_CONTROL_SHADER_BIT | GL_TESS_EVALUATION_SHADER_BIT | GL_GEOMETRY_SHADER_BIT, 0);
+    current_programs[1] = 0;
+    current_programs[2] = 0;
+    current_programs[3] = 0;
+
+    if (current_stage_mask != 0) {
+        current_stage_mask = 0;
+        for (const GLenum program_type : ASSEMBLY_PROGRAM_ENUMS) {
+            glDisable(program_type);
+        }
+    }
+    BindPipeline();
+}
+
+void ProgramManager::BindAssemblyPrograms(std::span<const OGLAssemblyProgram, NUM_STAGES> programs,
+                                          u32 stage_mask) {
+    const u32 changed_mask = current_stage_mask ^ stage_mask;
+    current_stage_mask = stage_mask;
+
+    if (changed_mask != 0) {
+        for (size_t stage = 0; stage < NUM_STAGES; ++stage) {
+            if (((changed_mask >> stage) & 1) != 0) {
+                if (((stage_mask >> stage) & 1) != 0) {
+                    glEnable(ASSEMBLY_PROGRAM_ENUMS[stage]);
+                } else {
+                    glDisable(ASSEMBLY_PROGRAM_ENUMS[stage]);
+                }
+            }
+        }
+    }
+    for (size_t stage = 0; stage < NUM_STAGES; ++stage) {
+        if (current_programs[stage] != programs[stage].handle) {
+            current_programs[stage] = programs[stage].handle;
+            glBindProgramARB(ASSEMBLY_PROGRAM_ENUMS[stage], programs[stage].handle);
+        }
+    }
+    UnbindPipeline();
+}
+
+void ProgramManager::RestoreGuestCompute() {}
+
+void ProgramManager::BindPipeline() {
+    if (!is_pipeline_bound) {
+        is_pipeline_bound = true;
+        glBindProgramPipeline(pipeline.handle);
+    }
+    UnbindCompute();
+}
+
+void ProgramManager::UnbindPipeline() {
+    if (is_pipeline_bound) {
+        is_pipeline_bound = false;
+        glBindProgramPipeline(0);
+    }
+    UnbindCompute();
+}
+
+void ProgramManager::UnbindCompute() {
+    if (is_compute_bound) {
+        is_compute_bound = false;
+        glUseProgram(0);
+    }
+}
+} // namespace OpenGL
-- 
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