Initial commit

engines/alcachofa/graphics-opengl-base.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "alcachofa/graphics-opengl-base.h"
+
+#include "common/config-manager.h"
+#include "common/system.h"
+#include "graphics/renderer.h"
+
+using namespace Common;
+using namespace Graphics;
+using namespace Math;
+
+namespace Alcachofa {
+
+OpenGLRendererBase::OpenGLRendererBase(Point resolution) : _resolution(resolution) {}
+
+bool OpenGLRendererBase::hasOutput() const {
+	return _currentOutput != nullptr;
+}
+
+void OpenGLRendererBase::resetState() {
+	setViewportToScreen();
+	_currentOutput = nullptr;
+	_currentLodBias = -1000.0f;
+	_currentBlendMode = (BlendMode)-1;
+	_isFirstDrawCommand = true;
+}
+
+void OpenGLRendererBase::setViewportToScreen() {
+	int32 screenWidth = g_system->getWidth();
+	int32 screenHeight = g_system->getHeight();
+	Rect viewport(
+		MIN<int32>(screenWidth, screenHeight * (float)_resolution.x / _resolution.y),
+		MIN<int32>(screenHeight, screenWidth * (float)_resolution.y / _resolution.x));
+	viewport.translate(
+		(screenWidth - viewport.width()) / 2,
+		(screenHeight - viewport.height()) / 2);
+
+	setViewportInner(viewport.left, viewport.top, viewport.width(), viewport.height());
+	setMatrices(true);
+}
+
+void OpenGLRendererBase::setViewportToRect(int16 outputWidth, int16 outputHeight) {
+	_outputSize.x = MIN(outputWidth, g_system->getWidth());
+	_outputSize.y = MIN(outputHeight, g_system->getHeight());
+	setViewportInner(0, 0, _outputSize.x, _outputSize.y);
+	setMatrices(false);
+}
+
+void OpenGLRendererBase::getQuadPositions(Vector2d topLeft, Vector2d size, Angle rotation, Vector2d positions[]) const {
+	positions[0] = topLeft + Vector2d(0, 0);
+	positions[1] = topLeft + Vector2d(0, +size.getY());
+	positions[2] = topLeft + Vector2d(+size.getX(), +size.getY());
+	positions[3] = topLeft + Vector2d(+size.getX(), 0);
+	if (abs(rotation.getDegrees()) > epsilon) {
+		const Vector2d zero(0, 0);
+		for (int i = 0; i < 4; i++)
+			positions[i].rotateAround(zero, rotation);
+	}
+}
+
+void OpenGLRendererBase::getQuadTexCoords(Vector2d texMin, Vector2d texMax, Vector2d texCoords[]) const {
+	texCoords[0] = { texMin.getX(), texMin.getY() };
+	texCoords[1] = { texMin.getX(), texMax.getY() };
+	texCoords[2] = { texMax.getX(), texMax.getY() };
+	texCoords[3] = { texMax.getX(), texMin.getY() };
+}
+
+IRenderer *IRenderer::createOpenGLRenderer(Point resolution) {
+	const auto available = Renderer::getAvailableTypes();
+	const auto &rendererCode = ConfMan.get("renderer");
+	RendererType rendererType = Renderer::parseTypeCode(rendererCode);
+	rendererType = (RendererType)(rendererType & available);
+
+	IRenderer *renderer = nullptr;
+	switch (rendererType) {
+	case kRendererTypeOpenGLShaders:
+		renderer = createOpenGLRendererShaders(resolution);
+		break;
+	case kRendererTypeOpenGL:
+		renderer = createOpenGLRendererClassic(resolution);
+		break;
+	case kRendererTypeTinyGL:
+		renderer = createTinyGLRenderer(resolution);
+		break;
+	default:
+		if (available & kRendererTypeOpenGLShaders)
+			renderer = createOpenGLRendererShaders(resolution);
+		else if (available & kRendererTypeOpenGL)
+			renderer = createOpenGLRendererClassic(resolution);
+		else if (available & kRendererTypeTinyGL)
+			renderer = createTinyGLRenderer(resolution);
+		break;
+	}
+
+	if (renderer == nullptr)
+		error("Could not create a renderer, available: %d", (int)available);
+	return renderer;
+}
+
+#ifndef USE_OPENGL_SHADERS
+IRenderer *IRenderer::createOpenGLRendererShaders(Point _) {
+	(void)_;
+	return nullptr;
+}
+#endif
+
+#ifndef USE_OPENGL_GAME
+IRenderer *IRenderer::createOpenGLRendererClassic(Point _) {
+	(void)_;
+	return nullptr;
+}
+#endif
+
+#ifndef USE_TINYGL
+IRenderer *IRenderer::createTinyGLRenderer(Point _) {
+	(void)_;
+	return nullptr;
+}
+#endif
+
+}