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Diffstat (limited to 'backends/graphics/opengl/pipelines/pipeline.h')
-rw-r--r-- | backends/graphics/opengl/pipelines/pipeline.h | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/backends/graphics/opengl/pipelines/pipeline.h b/backends/graphics/opengl/pipelines/pipeline.h new file mode 100644 index 0000000000..9f32d33b95 --- /dev/null +++ b/backends/graphics/opengl/pipelines/pipeline.h @@ -0,0 +1,126 @@ +/* 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. + * + */ + +#ifndef BACKENDS_GRAPHICS_OPENGL_PIPELINES_PIPELINE_H +#define BACKENDS_GRAPHICS_OPENGL_PIPELINES_PIPELINE_H + +#include "backends/graphics/opengl/opengl-sys.h" +#include "backends/graphics/opengl/texture.h" + +namespace OpenGL { + +class Framebuffer; + +/** + * Interface for OpenGL pipeline functionality. + * + * This encapsulates differences in various rendering pipelines used for + * OpenGL, OpenGL ES 1, and OpenGL ES 2. + */ +class Pipeline { +public: + Pipeline(); + virtual ~Pipeline() {} + + /** + * Activate the pipeline. + * + * This sets the OpenGL state to make use of drawing with the given + * OpenGL pipeline. + */ + void activate(); + + /** + * Deactivate the pipeline. + */ + void deactivate(); + + /** + * Set framebuffer to render to. + * + * Client is responsible for any memory management related to framebuffer. + * + * @param framebuffer Framebuffer to activate. + * @return Formerly active framebuffer. + */ + Framebuffer *setFramebuffer(Framebuffer *framebuffer); + + /** + * Set modulation color. + * + * @param r Red component in [0,1]. + * @param g Green component in [0,1]. + * @param b Blue component in [0,1]. + * @param a Alpha component in [0,1]. + */ + virtual void setColor(GLfloat r, GLfloat g, GLfloat b, GLfloat a) = 0; + + /** + * Draw a texture rectangle to the currently active framebuffer. + * + * @param texture Texture to use for drawing. + * @param coordinates x1, y1, x2, y2 coordinates where to draw the texture. + */ + virtual void drawTexture(const GLTexture &texture, const GLfloat *coordinates) = 0; + + void drawTexture(const GLTexture &texture, GLfloat x, GLfloat y, GLfloat w, GLfloat h) { + const GLfloat coordinates[4*2] = { + x, y, + x + w, y, + x, y + h, + x + w, y + h + }; + drawTexture(texture, coordinates); + } + + /** + * Set the projection matrix. + * + * This is intended to be only ever be used by Framebuffer subclasses. + */ + virtual void setProjectionMatrix(const GLfloat *projectionMatrix) = 0; + +protected: + /** + * Activate the pipeline. + * + * This sets the OpenGL state to make use of drawing with the given + * OpenGL pipeline. + */ + virtual void activateInternal() = 0; + + /** + * Deactivate the pipeline. + */ + virtual void deactivateInternal() {} + + bool isActive() const { return _isActive; } + + Framebuffer *_activeFramebuffer; + +private: + bool _isActive; +}; + +} // End of namespace OpenGL + +#endif |