From 05dc633a8c35221ce8d6abe6ddf027f8b0bab6c2 Mon Sep 17 00:00:00 2001
From: tfarley <tfarleygithub@gmail.com>
Date: Mon, 18 May 2015 21:21:33 -0700
Subject: OpenGL renderer

---
 src/video_core/renderer_opengl/gl_state.cpp | 160 ++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100644 src/video_core/renderer_opengl/gl_state.cpp

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

diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp
new file mode 100644
index 00000000..ca8a371e
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_state.cpp
@@ -0,0 +1,160 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "video_core/renderer_opengl/gl_state.h"
+#include "video_core/pica.h"
+
+OpenGLState OpenGLState::cur_state;
+
+OpenGLState::OpenGLState() {
+    // These all match default OpenGL values
+    cull.enabled = false;
+    cull.mode = GL_BACK;
+
+    depth.test_enabled = false;
+    depth.test_func = GL_LESS;
+    depth.write_mask = GL_TRUE;
+
+    stencil.test_enabled = false;
+    stencil.test_func = GL_ALWAYS;
+    stencil.test_ref = 0;
+    stencil.test_mask = -1;
+    stencil.write_mask = -1;
+
+    blend.enabled = false;
+    blend.src_rgb_func = GL_ONE;
+    blend.dst_rgb_func = GL_ZERO;
+    blend.src_a_func = GL_ONE;
+    blend.dst_a_func = GL_ZERO;
+    blend.color.red = 0.0f;
+    blend.color.green = 0.0f;
+    blend.color.blue = 0.0f;
+    blend.color.alpha = 0.0f;
+
+    for (auto& texture_unit : texture_units) {
+        texture_unit.enabled_2d = false;
+        texture_unit.texture_2d = 0;
+    }
+
+    draw.framebuffer = 0;
+    draw.vertex_array = 0;
+    draw.vertex_buffer = 0;
+    draw.shader_program = 0;
+}
+
+const void OpenGLState::Apply() {
+    // Culling
+    if (cull.enabled != cur_state.cull.enabled) {
+        if (cull.enabled) {
+            glEnable(GL_CULL_FACE);
+        } else {
+            glDisable(GL_CULL_FACE);
+        }
+    }
+
+    if (cull.mode != cur_state.cull.mode) {
+        glCullFace(cull.mode);
+    }
+
+    // Depth test
+    if (depth.test_enabled != cur_state.depth.test_enabled) {
+        if (depth.test_enabled) {
+            glEnable(GL_DEPTH_TEST);
+        } else {
+            glDisable(GL_DEPTH_TEST);
+        }
+    }
+
+    if (depth.test_func != cur_state.depth.test_func) {
+        glDepthFunc(depth.test_func);
+    }
+
+    // Depth mask
+    if (depth.write_mask != cur_state.depth.write_mask) {
+        glDepthMask(depth.write_mask);
+    }
+
+    // Stencil test
+    if (stencil.test_enabled != cur_state.stencil.test_enabled) {
+        if (stencil.test_enabled) {
+            glEnable(GL_STENCIL_TEST);
+        } else {
+            glDisable(GL_STENCIL_TEST);
+        }
+    } 
+
+    if (stencil.test_func != cur_state.stencil.test_func ||
+        stencil.test_ref != cur_state.stencil.test_ref ||
+        stencil.test_mask != cur_state.stencil.test_mask) {
+        glStencilFunc(stencil.test_func, stencil.test_ref, stencil.test_mask);
+    }
+
+    // Stencil mask
+    if (stencil.write_mask != cur_state.stencil.write_mask) {
+        glStencilMask(stencil.write_mask);
+    }
+
+    // Blending
+    if (blend.enabled != cur_state.blend.enabled) {
+        if (blend.enabled) {
+            glEnable(GL_BLEND);
+        } else {
+            glDisable(GL_BLEND);
+        }
+    }
+
+    if (blend.color.red != cur_state.blend.color.red ||
+        blend.color.green != cur_state.blend.color.green ||
+        blend.color.blue != cur_state.blend.color.blue ||
+        blend.color.alpha != cur_state.blend.color.alpha) {
+        glBlendColor(blend.color.red, blend.color.green, blend.color.blue, blend.color.alpha);
+    }
+
+    if (blend.src_rgb_func != cur_state.blend.src_rgb_func ||
+        blend.dst_rgb_func != cur_state.blend.dst_rgb_func ||
+        blend.src_a_func != cur_state.blend.src_a_func ||
+        blend.dst_a_func != cur_state.blend.dst_a_func) {
+        glBlendFuncSeparate(blend.src_rgb_func, blend.dst_rgb_func, blend.src_a_func, blend.dst_a_func);
+    }
+
+    // Textures
+    for (unsigned texture_index = 0; texture_index < ARRAY_SIZE(texture_units); ++texture_index) {
+        if (texture_units[texture_index].enabled_2d != texture_units[texture_index].enabled_2d) {
+            glActiveTexture(GL_TEXTURE0 + texture_index);
+
+            if (texture_units[texture_index].enabled_2d) {
+                glEnable(GL_TEXTURE_2D);
+            } else {
+                glDisable(GL_TEXTURE_2D);
+            }
+        }
+
+        if (texture_units[texture_index].texture_2d != cur_state.texture_units[texture_index].texture_2d) {
+            glActiveTexture(GL_TEXTURE0 + texture_index);
+            glBindTexture(GL_TEXTURE_2D, texture_units[texture_index].texture_2d);
+        }
+    }
+
+    // Framebuffer
+    if (draw.framebuffer != cur_state.draw.framebuffer) {
+        glBindFramebuffer(GL_FRAMEBUFFER, draw.framebuffer);
+    }
+
+    // Vertex array
+    if (draw.vertex_array != cur_state.draw.vertex_array) {
+        glBindVertexArray(draw.vertex_array);
+    }
+
+    // Vertex buffer
+    if (draw.vertex_buffer != cur_state.draw.vertex_buffer) {
+        glBindBuffer(GL_ARRAY_BUFFER, draw.vertex_buffer);
+    }
+
+    // Shader program
+    if (draw.shader_program != cur_state.draw.shader_program) {
+        glUseProgram(draw.shader_program);
+    }
+
+    cur_state = *this;
+}
-- 
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