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engines/grim/gfx_opengl_shaders.h

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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/>.
+ *
+ */
+
+#ifndef GRIM_GFX_OPENGL_SHADERS_H
+#define GRIM_GFX_OPENGL_SHADERS_H
+
+#include "engines/grim/actor.h"
+#include "engines/grim/gfx_base.h"
+
+#include "graphics/opengl/shader.h"
+
+#include "common/stack.h"
+#include "common/rect.h"
+
+namespace Grim {
+
+class GfxOpenGLS : public GfxBase {
+public:
+	GfxOpenGLS();
+	virtual ~GfxOpenGLS();
+
+	/**
+	 * Creates a render-context.
+	 *
+	 * @param screenW        the width of the context
+	 * @param screenH        the height of the context
+	 */
+	void setupScreen(int screenW, int screenH) override;
+
+	/**
+	 * Query whether the current context is hardware-accelerated
+	 *
+	 * @return true if hw-accelerated, false otherwise
+	 */
+	bool isHardwareAccelerated() override { return true; };
+	bool supportsShaders() override { return true; }
+	void setupCameraFrustum(float fov, float nclip, float fclip) override;
+	void positionCamera(const Math::Vector3d &pos, const Math::Vector3d &interest, float roll) override;
+	void positionCamera(const Math::Vector3d &pos, const Math::Matrix4 &rot) override;
+
+	Math::Matrix4 getModelView() override;
+	Math::Matrix4 getProjection() override;
+
+	void clearScreen() override;
+	void clearDepthBuffer() override;
+
+	/**
+	 * Swap the buffers, making the drawn screen visible
+	 */
+	void flipBuffer(bool opportunistic = false) override;
+
+	void getScreenBoundingBox(const Mesh *mesh, int *x1, int *y1, int *x2, int *y2) override;
+	void getScreenBoundingBox(const EMIModel *model, int *x1, int *y1, int *x2, int *y2) override;
+	void getActorScreenBBox(const Actor *actor, Common::Point &p1, Common::Point &p2) override;
+	void startActorDraw(const Actor *actor) override;
+
+	void finishActorDraw() override;
+	void setShadow(Shadow *shadow) override;
+	void drawShadowPlanes() override;
+	void setShadowMode() override;
+	void clearShadowMode() override;
+	void setShadowColor(byte r, byte g, byte b) override;
+	void getShadowColor(byte *r, byte *g, byte *b) override;
+	void destroyShadow(Shadow *shadow) override;
+
+	void set3DMode() override;
+
+	void translateViewpointStart() override;
+	void translateViewpoint(const Math::Vector3d &vec) override;
+	void rotateViewpoint(const Math::Angle &angle, const Math::Vector3d &axis) override;
+	void rotateViewpoint(const Math::Matrix4 &rot) override;
+	void translateViewpointFinish() override;
+
+	void drawEMIModelFace(const EMIModel* model, const EMIMeshFace* face) override;
+	void drawModelFace(const Mesh *mesh, const MeshFace *face) override;
+	void drawSprite(const Sprite *sprite) override;
+	void drawMesh(const Mesh *mesh) override;
+	void drawDimPlane() override;
+
+	void enableLights() override;
+	void disableLights() override;
+	void setupLight(Light *light, int lightId) override;
+	void turnOffLight(int lightId) override;
+
+	void createTexture(Texture *texture, const uint8 *data, const CMap *cmap, bool clamp) override;
+	void selectTexture(const Texture *texture) override;
+	void destroyTexture(Texture *texture) override;
+
+	/**
+	 * Prepares a bitmap for drawing
+	 * performs any format conversions needed for the renderer,
+	 * and might create an internal representation of the bitmap
+	 * external changes to the bitmap may not be visible after this
+	 * is called. Must be called before drawBitmap can be used.
+	 *
+	 * the external bitmap might have its data changed by this function,
+	 *
+	 * @param bitmap       the bitmap to be prepared
+	 * @see destroyBitmap
+	 * @see drawBitmap
+	 */
+	void createBitmap(BitmapData *bitmap) override;
+
+	/**
+	 * Draws a bitmap
+	 * before this is safe to use, createBitmap MUST have been called
+	 *
+	 * @param bitmap       the bitmap to be drawn
+	 * @see createBitmap
+	 * @see destroyBitmap
+	 */
+	void drawBitmap(const Bitmap *bitmap, int x, int y, uint32 layer = 0) override;
+
+	/**
+	 * Deletes any internal references and representations of a bitmap
+	 * after this is called, it is safe to dispose of or change the external
+	 * bitmapdata.
+	 *
+	 * @param bitmap       the bitmap to be destroyed
+	 * @see createBitmap
+	 * @see drawBitmap
+	 */
+	void destroyBitmap(BitmapData *bitmap) override;
+
+	void createFont(Font *font) override;
+	void destroyFont(Font *font) override;
+
+	void createTextObject(TextObject *text) override;
+	void drawTextObject(const TextObject *text) override;
+	void destroyTextObject(TextObject *text) override;
+
+	Bitmap *getScreenshot(int w, int h, bool useStored) override;
+	void storeDisplay() override;
+	void copyStoredToDisplay() override;
+
+	/**
+	 * Dims the entire screen
+	 * Sets the entire screen to 10% of its current brightness,
+	 * and converts it to grayscale.
+	 */
+	void dimScreen() override;
+	void dimRegion(int x, int y, int w, int h, float level) override;
+
+	/**
+	 * Draw a completely opaque Iris around the specified rectangle.
+	 * the arguments specify the distance from the screen-edge to the first
+	 * non-iris pixel.
+	 *
+	 * @param x		the width of the Iris
+	 * @param y		the height of the Iris
+	 */
+	void irisAroundRegion(int x1, int y1, int x2, int y2) override;
+
+	void drawEmergString(int x, int y, const char *text, const Color &fgColor) override;
+	void loadEmergFont() override;
+
+	void drawRectangle(const PrimitiveObject *primitive) override;
+	void drawLine(const PrimitiveObject *primitive) override;
+	void drawPolygon(const PrimitiveObject *primitive) override;
+
+	const Graphics::PixelFormat getMovieFormat() const override;
+
+	/**
+	 * Prepare a movie-frame for drawing
+	 * performing any necessary conversion
+	 *
+	 * @param width         the width of the movie-frame.
+	 * @param height        the height of the movie-frame.
+	 * @param bitmap        a pointer to the data for the movie-frame.
+	 * @see drawMovieFrame
+	 * @see releaseMovieFrame
+	 */
+	void prepareMovieFrame(Graphics::Surface* frame) override;
+	void drawMovieFrame(int offsetX, int offsetY) override;
+
+	/**
+	 * Release the currently prepared movie-frame, if one exists.
+	 *
+	 * @see drawMovieFrame
+	 * @see prepareMovieFrame
+	 */
+	void releaseMovieFrame() override;
+
+	const char *getVideoDeviceName() override;
+
+	void renderBitmaps(bool render) override;
+	void renderZBitmaps(bool render) override;
+
+	void createMesh(Mesh *mesh) override;
+	void destroyMesh(const Mesh *mesh) override;
+	void createEMIModel(EMIModel *model) override;
+	void updateEMIModel(const EMIModel* model) override;
+	void destroyEMIModel(EMIModel *model) override;
+
+	void setBlendMode(bool additive) override;
+
+protected:
+	void setupShaders();
+	GLuint compileShader(const char *vertex, const char *fragment);
+	GLuint compileShader(const char *shader) { return compileShader(shader, shader); }
+	void createSpecialtyTextureFromScreen(uint id, uint8 *data, int x, int y, int width, int height) override;
+
+private:
+	const Actor *_currentActor;
+	float _alpha;
+	int _maxLights;
+	GLuint _emergTexture;
+	OpenGL::Shader* _emergProgram;
+
+	OpenGL::Shader* _backgroundProgram;
+	OpenGL::Shader* _actorProgram;
+	OpenGL::Shader* _actorLightsProgram;
+	OpenGL::Shader* _spriteProgram;
+	OpenGL::Shader* _dimProgram;
+	OpenGL::Shader* _dimPlaneProgram;
+	OpenGL::Shader* _dimRegionProgram;
+	OpenGL::Shader* _smushProgram;
+	GLuint _smushVBO, _quadEBO;
+	OpenGL::Shader* _textProgram;
+	OpenGL::Shader* _primitiveProgram;
+	OpenGL::Shader* _irisProgram;
+	OpenGL::Shader* _shadowPlaneProgram;
+
+	int _smushWidth;
+	int _smushHeight;
+	GLuint _smushTexId;
+	void setupTexturedQuad();
+	void setupQuadEBO();
+
+	void setupZBuffer();
+	void drawDepthBitmap(int bitmapId, int x, int y, int w, int h, char *data);
+
+	float _fov;
+	float _nclip;
+	float _fclip;
+	Math::Matrix4 _projMatrix;
+	Math::Matrix4 _viewMatrix;
+	Math::Matrix4 _mvpMatrix;
+	Math::Matrix4 _overworldProjMatrix;
+
+	void setupTexturedCenteredQuad();
+
+	GLuint _spriteVBO;
+
+	Common::Stack<Math::Matrix4> _matrixStack;
+	Texture *_selectedTexture;
+
+	GLuint _zBufTex;
+	Math::Vector2d _zBufTexCrop;
+
+	struct GLSLight {
+		Math::Vector4d _position;
+		Math::Vector4d _direction;
+		Math::Vector4d _color;
+		Math::Vector4d _params;
+	};
+
+	GLSLight *_lights;
+	bool _hasAmbientLight;
+	bool _lightsEnabled;
+
+	void setupPrimitives();
+	GLuint nextPrimitive();
+	GLuint _primitiveVBOs[32];
+	uint32 _currentPrimitive;
+	void drawGenericPrimitive(const float *vertices, uint32 numVertices, const PrimitiveObject *primitive);
+	GLuint _irisVBO;
+	GLuint _dimVBO;
+	GLuint _dimRegionVBO;
+	GLuint _blastVBO;
+	GLuint _storedDisplay;
+};
+
+}
+
+#endif