1 files changed, 144 insertions, 0 deletions
diff --git a/src/scene-terrain/base-renderer.cpp b/src/scene-terrain/base-renderer.cpp
new file mode 100644
index 0000000..b00c3d5
--- /dev/null
+++ b/src/scene-terrain/base-renderer.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright © 2012 Linaro Limited
+ *
+ * This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
+ *
+ * glmark2 is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * glmark2.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ *  Alexandros Frantzis
+ */
+#include "renderer.h"
+
+BaseRenderer::BaseRenderer(const LibMatrix::vec2 &size) :
+    texture_(0), input_texture_(0), fbo_(0), depth_renderbuffer_(0),
+    min_filter_(GL_LINEAR), mag_filter_(GL_LINEAR),
+    wrap_s_(GL_CLAMP_TO_EDGE), wrap_t_(GL_CLAMP_TO_EDGE)
+{
+    setup(size, true, true);
+}
+
+BaseRenderer::~BaseRenderer()
+{
+    glDeleteTextures(1, &texture_);
+    glDeleteRenderbuffers(1, &depth_renderbuffer_);
+    glDeleteFramebuffers(1, &fbo_);
+}
+
+void
+BaseRenderer::setup(const LibMatrix::vec2 &size, bool onscreen, bool has_depth)
+{
+    size_ = size;
+    recreate(onscreen, has_depth);
+}
+
+void
+BaseRenderer::setup_texture(GLint min_filter, GLint mag_filter,
+                            GLint wrap_s, GLint wrap_t)
+{
+    min_filter_ = min_filter;
+    mag_filter_ = mag_filter;
+    wrap_s_ = wrap_s;
+    wrap_t_ = wrap_t;
+    update_texture_parameters();
+}
+
+void
+BaseRenderer::make_current()
+{
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glViewport(0, 0, size_.x(), size_.y());
+    if (!fbo_ || depth_renderbuffer_) {
+        glEnable(GL_DEPTH_TEST);
+        glDepthMask(GL_TRUE);
+    }
+    else {
+        glDisable(GL_DEPTH_TEST);
+        glDepthMask(GL_FALSE);
+    }
+}
+
+void
+BaseRenderer::update_mipmap()
+{
+    if (texture_ && min_filter_ != GL_NEAREST && min_filter_ != GL_LINEAR) {
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+}
+
+void
+BaseRenderer::recreate(bool onscreen, bool has_depth)
+{
+    if (texture_) {
+        glDeleteTextures(1, &texture_);
+        texture_ = 0;
+    }
+    if (fbo_) {
+        glDeleteRenderbuffers(1, &depth_renderbuffer_);
+        depth_renderbuffer_ = 0;
+        glDeleteFramebuffers(1, &fbo_);
+        fbo_ = 0;
+    }
+    if (!onscreen) {
+        create_texture();
+        create_fbo(has_depth);
+    }
+}
+
+void
+BaseRenderer::create_texture()
+{
+    glGenTextures(1, &texture_);
+    glBindTexture(GL_TEXTURE_2D, texture_);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size_.x(), size_.y(), 0,
+            GL_RGBA, GL_UNSIGNED_BYTE, 0);
+    update_texture_parameters();
+}
+
+void
+BaseRenderer::update_texture_parameters()
+{
+    if (texture_) {
+        glBindTexture(GL_TEXTURE_2D, texture_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, min_filter_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mag_filter_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrap_s_);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrap_t_);
+    }
+    update_mipmap();
+}
+
+void
+BaseRenderer::create_fbo(bool has_depth)
+{
+    if (has_depth) {
+        /* Create a renderbuffer for depth storage */
+        glGenRenderbuffers(1, &depth_renderbuffer_);
+        glBindRenderbuffer(GL_RENDERBUFFER, depth_renderbuffer_);
+        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16,
+                size_.x(), size_.y());
+    }
+
+    /* Create the FBO and attach the texture and the renderebuffer */
+    glGenFramebuffers(1, &fbo_);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+            GL_TEXTURE_2D, texture_, 0);
+    if (has_depth) {
+        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+                GL_RENDERBUFFER, depth_renderbuffer_);
+    }
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}