Merge branch 'master' into xeen

1 files changed, 259 insertions, 0 deletions

diff --git a/backends/graphics/opengl/framebuffer.cpp b/backends/graphics/opengl/framebuffer.cpp
new file mode 100644
index 0000000000..7191aab8bc
--- /dev/null
+++ b/backends/graphics/opengl/framebuffer.cpp
@@ -0,0 +1,259 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "backends/graphics/opengl/framebuffer.h"
+#include "backends/graphics/opengl/texture.h"
+#include "backends/graphics/opengl/pipelines/pipeline.h"
+
+namespace OpenGL {
+
+Framebuffer::Framebuffer()
+    : _viewport(), _projectionMatrix(), _isActive(false), _clearColor(),
+      _blendState(false), _scissorTestState(false), _scissorBox() {
+}
+
+void Framebuffer::activate() {
+	_isActive = true;
+
+	applyViewport();
+	applyProjectionMatrix();
+	applyClearColor();
+	applyBlendState();
+	applyScissorTestState();
+	applyScissorBox();
+
+	activateInternal();
+}
+
+void Framebuffer::deactivate() {
+	_isActive = false;
+
+	deactivateInternal();
+}
+
+void Framebuffer::setClearColor(GLfloat r, GLfloat g, GLfloat b, GLfloat a) {
+	_clearColor[0] = r;
+	_clearColor[1] = g;
+	_clearColor[2] = b;
+	_clearColor[3] = a;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyClearColor();
+	}
+}
+
+void Framebuffer::enableBlend(bool enable) {
+	_blendState = enable;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyBlendState();
+	}
+}
+
+void Framebuffer::enableScissorTest(bool enable) {
+	_scissorTestState = enable;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyScissorTestState();
+	}
+}
+
+void Framebuffer::setScissorBox(GLint x, GLint y, GLsizei w, GLsizei h) {
+	_scissorBox[0] = x;
+	_scissorBox[1] = y;
+	_scissorBox[2] = w;
+	_scissorBox[3] = h;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyScissorBox();
+	}
+}
+
+void Framebuffer::applyViewport() {
+	GL_CALL(glViewport(_viewport[0], _viewport[1], _viewport[2], _viewport[3]));
+}
+
+void Framebuffer::applyProjectionMatrix() {
+	g_context.getActivePipeline()->setProjectionMatrix(_projectionMatrix);
+}
+
+void Framebuffer::applyClearColor() {
+	GL_CALL(glClearColor(_clearColor[0], _clearColor[1], _clearColor[2], _clearColor[3]));
+}
+
+void Framebuffer::applyBlendState() {
+	if (_blendState) {
+		GL_CALL(glEnable(GL_BLEND));
+	} else {
+		GL_CALL(glDisable(GL_BLEND));
+	}
+}
+
+void Framebuffer::applyScissorTestState() {
+	if (_scissorTestState) {
+		GL_CALL(glEnable(GL_SCISSOR_TEST));
+	} else {
+		GL_CALL(glDisable(GL_SCISSOR_TEST));
+	}
+}
+
+void Framebuffer::applyScissorBox() {
+	GL_CALL(glScissor(_scissorBox[0], _scissorBox[1], _scissorBox[2], _scissorBox[3]));
+}
+
+//
+// Backbuffer implementation
+//
+
+void Backbuffer::activateInternal() {
+#if !USE_FORCED_GLES
+	if (g_context.framebufferObjectSupported) {
+		GL_CALL(glBindFramebuffer(GL_FRAMEBUFFER, 0));
+	}
+#endif
+}
+
+void Backbuffer::setDimensions(uint width, uint height) {
+	// Set viewport dimensions.
+	_viewport[0] = 0;
+	_viewport[1] = 0;
+	_viewport[2] = width;
+	_viewport[3] = height;
+
+	// Setup orthogonal projection matrix.
+	_projectionMatrix[ 0] =  2.0f / width;
+	_projectionMatrix[ 1] =  0.0f;
+	_projectionMatrix[ 2] =  0.0f;
+	_projectionMatrix[ 3] =  0.0f;
+
+	_projectionMatrix[ 4] =  0.0f;
+	_projectionMatrix[ 5] = -2.0f / height;
+	_projectionMatrix[ 6] =  0.0f;
+	_projectionMatrix[ 7] =  0.0f;
+
+	_projectionMatrix[ 8] =  0.0f;
+	_projectionMatrix[ 9] =  0.0f;
+	_projectionMatrix[10] =  0.0f;
+	_projectionMatrix[11] =  0.0f;
+
+	_projectionMatrix[12] = -1.0f;
+	_projectionMatrix[13] =  1.0f;
+	_projectionMatrix[14] =  0.0f;
+	_projectionMatrix[15] =  1.0f;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyViewport();
+		applyProjectionMatrix();
+	}
+}
+
+//
+// Render to texture target implementation
+//
+
+#if !USE_FORCED_GLES
+TextureTarget::TextureTarget()
+    : _texture(new GLTexture(GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE)), _glFBO(0), _needUpdate(true) {
+}
+
+TextureTarget::~TextureTarget() {
+	delete _texture;
+	GL_CALL_SAFE(glDeleteFramebuffers, (1, &_glFBO));
+}
+
+void TextureTarget::activateInternal() {
+	// Allocate framebuffer object if necessary.
+	if (!_glFBO) {
+		GL_CALL(glGenFramebuffers(1, &_glFBO));
+		_needUpdate = true;
+	}
+
+	// Attach destination texture to FBO.
+	GL_CALL(glBindFramebuffer(GL_FRAMEBUFFER, _glFBO));
+
+	// If required attach texture to FBO.
+	if (_needUpdate) {
+		GL_CALL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture->getGLTexture(), 0));
+		_needUpdate = false;
+	}
+}
+
+void TextureTarget::destroy() {
+	GL_CALL(glDeleteFramebuffers(1, &_glFBO));
+	_glFBO = 0;
+
+	_texture->destroy();
+}
+
+void TextureTarget::create() {
+	_texture->create();
+
+	_needUpdate = true;
+}
+
+void TextureTarget::setSize(uint width, uint height) {
+	_texture->setSize(width, height);
+
+	const uint texWidth  = _texture->getWidth();
+	const uint texHeight = _texture->getHeight();
+
+	// Set viewport dimensions.
+	_viewport[0] = 0;
+	_viewport[1] = 0;
+	_viewport[2] = texWidth;
+	_viewport[3] = texHeight;
+
+	// Setup orthogonal projection matrix.
+	_projectionMatrix[ 0] =  2.0f / texWidth;
+	_projectionMatrix[ 1] =  0.0f;
+	_projectionMatrix[ 2] =  0.0f;
+	_projectionMatrix[ 3] =  0.0f;
+
+	_projectionMatrix[ 4] =  0.0f;
+	_projectionMatrix[ 5] =  2.0f / texHeight;
+	_projectionMatrix[ 6] =  0.0f;
+	_projectionMatrix[ 7] =  0.0f;
+
+	_projectionMatrix[ 8] =  0.0f;
+	_projectionMatrix[ 9] =  0.0f;
+	_projectionMatrix[10] =  0.0f;
+	_projectionMatrix[11] =  0.0f;
+
+	_projectionMatrix[12] = -1.0f;
+	_projectionMatrix[13] = -1.0f;
+	_projectionMatrix[14] =  0.0f;
+	_projectionMatrix[15] =  1.0f;
+
+	// Directly apply changes when we are active.
+	if (isActive()) {
+		applyViewport();
+		applyProjectionMatrix();
+	}
+}
+#endif // !USE_FORCED_GLES
+
+} // End of namespace OpenGL