Changeset - r24908:4dfe7bc46264
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Michael Lutz - 4 years ago 2021-01-16 15:43:42
michi@icosahedron.de
Add: [OpenGL] Support for a separate animation buffer that stores the palette values of the screen in addition to the colour buffer.
6 files changed with 122 insertions and 6 deletions:
src/blitter/base.hpp
8
src/video/opengl.cpp
78
2
src/video/opengl.h
5
src/video/video_driver.hpp
18
src/video/win32_v.cpp
5
src/video/win32_v.h
8
4
0 comments (0 inline, 0 general)
src/blitter/base.hpp
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@@ -186,6 +186,14 @@ public:
 
	virtual Blitter::PaletteAnimation UsePaletteAnimation() = 0;
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Does this blitter require a separate animation buffer from the video backend?

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	virtual bool NeedsAnimationBuffer()

			




	
	
	
		
 
	{

			




	
	
	
		
 
		return false;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Get the name of the blitter, the same as the Factory-instance returns.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	virtual const char *GetName() = 0;

			




        

    


    
    

    

        

                

                    src/video/opengl.cpp
                

                

                  
                      
                        

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@@ -392,8 +392,10 @@ OpenGLBackend::~OpenGLBackend()

			




	
	
	
		
 
	if (_glDeleteBuffers != nullptr) {

			




	
	
	
		
 
		_glDeleteBuffers(1, &this->vbo_quad);

			




	
	
	
		
 
		_glDeleteBuffers(1, &this->vid_pbo);

			




	
	
	
		
 
		_glDeleteBuffers(1, &this->anim_pbo);

			




	
	
	
		
 
	}

			




	
	
	
		
 
	glDeleteTextures(1, &this->vid_texture);

			




	
	
	
		
 
	glDeleteTextures(1, &this->anim_texture);

			




	
	
	
		
 
	glDeleteTextures(1, &this->pal_texture);

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
		
 
@@ -458,6 +460,17 @@ const char *OpenGLBackend::Init()

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_2D, 0);

			




	
	
	
		
 
	if (glGetError() != GL_NO_ERROR) return "Can't generate video buffer texture";

			




	
	
	
		
 

			




	
	
	
		
 
	/* Setup video buffer texture. */

			




	
	
	
		
 
	glGenTextures(1, &this->anim_texture);

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_2D, this->anim_texture);

			




	
	
	
		
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

			




	
	
	
		
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

			




	
	
	
		
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);

			




	
	
	
		
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

			




	
	
	
		
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_2D, 0);

			




	
	
	
		
 
	if (glGetError() != GL_NO_ERROR) return "Can't generate animation buffer texture";

			




	
	
	
		
 

			




	
	
	
		
 
	/* Setup palette texture. */

			




	
	
	
		
 
	glGenTextures(1, &this->pal_texture);

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_1D, this->pal_texture);

			




	
	
		
 
@@ -505,10 +518,13 @@ const char *OpenGLBackend::Init()

			




	
	
	
		
 
	_glUniform1i(tex_location, 0);     // Texture unit 0.

			




	
	
	
		
 
	_glUniform1i(palette_location, 1); // Texture unit 1.

			




	
	
	
		
 
	_glUniform1i(remap_location, 2);   // Texture unit 2.

			




	
	
	
		
 
	(void)glGetError(); // Clear errors.

			




	
	
	
		
 

			




	
	
	
		
 
	/* Create pixel buffer object as video buffer storage. */

			




	
	
	
		
 
	_glGenBuffers(1, &this->vid_pbo);

			




	
	
	
		
 
	_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vid_pbo);

			




	
	
	
		
 
	_glGenBuffers(1, &this->anim_pbo);

			




	
	
	
		
 
	_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->anim_pbo);

			




	
	
	
		
 
	if (glGetError() != GL_NO_ERROR) return "Can't allocate pixel buffer for video buffer";

			




	
	
	
		
 

			




	
	
	
		
 
	/* Prime vertex buffer with a full-screen quad and store

			




	
	
		
 
@@ -686,7 +702,7 @@ bool OpenGLBackend::Resize(int w, int h,

			




	
	
	
		
 
	if (!force && _screen.width == w && _screen.height == h) return false;

			




	
	
	
		
 

			




	
	
	
		
 
	int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();

			




	
	
	
		
 
	int pitch = bpp != 32 ? Align(w, 4) : w;

			




	
	
	
		
 
	int pitch = Align(w, 4);

			




	
	
	
		
 

			




	
	
	
		
 
	glViewport(0, 0, w, h);

			




	
	
	
		
 

			




	
	
		
 
@@ -715,6 +731,23 @@ bool OpenGLBackend::Resize(int w, int h,

			




	
	
	
		
 
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);

			




	
	
	
		
 
			break;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/* Does this blitter need a separate animation buffer? */

			




	
	
	
		
 
	if (BlitterFactory::GetCurrentBlitter()->NeedsAnimationBuffer()) {

			




	
	
	
		
 
		_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->anim_pbo);

			




	
	
	
		
 
		_glBufferData(GL_PIXEL_UNPACK_BUFFER, pitch * h, NULL, GL_DYNAMIC_READ); // Buffer content has to persist from frame to frame and is read back by the blitter, which means a READ usage hint.

			




	
	
	
		
 
		_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);

			




	
	
	
		
 

			




	
	
	
		
 
		glBindTexture(GL_TEXTURE_2D, this->anim_texture);

			




	
	
	
		
 
		glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, NULL);

			




	
	
	
		
 
	} else {

			




	
	
	
		
 
		/* Allocate dummy texture that always reads as 0 == no remap. */

			




	
	
	
		
 
		uint dummy = 0;

			




	
	
	
		
 
		glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);

			




	
	
	
		
 
		glBindTexture(GL_TEXTURE_2D, this->anim_texture);

			




	
	
	
		
 
		glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, 1, 1, 0, GL_RED, GL_UNSIGNED_BYTE, &dummy);

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_2D, 0);

			




	
	
	
		
 

			




	
	
	
		
 
	/* Set new viewport. */

			




	
	
		
 
@@ -761,7 +794,18 @@ void OpenGLBackend::Paint()

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_2D, this->vid_texture);

			




	
	
	
		
 
	_glActiveTexture(GL_TEXTURE1);

			




	
	
	
		
 
	glBindTexture(GL_TEXTURE_1D, this->pal_texture);

			




	
	
	
		
 
	_glUseProgram(BlitterFactory::GetCurrentBlitter()->GetScreenDepth() == 8 ? this->pal_program : this->vid_program);

			




	
	
	
		
 
	/* Is the blitter relying on a separate animation buffer? */

			




	
	
	
		
 
	if (BlitterFactory::GetCurrentBlitter()->NeedsAnimationBuffer()) {

			




	
	
	
		
 
		_glActiveTexture(GL_TEXTURE2);

			




	
	
	
		
 
		glBindTexture(GL_TEXTURE_2D, this->anim_texture);

			




	
	
	
		
 
		_glUseProgram(this->remap_program);

			




	
	
	
		
 
		_glUniform4f(this->remap_sprite_loc, 0.0f, 0.0f, 1.0f, 1.0f);

			




	
	
	
		
 
		_glUniform2f(this->remap_screen_loc, 1.0f, 1.0f);

			




	
	
	
		
 
		_glUniform1f(this->remap_zoom_loc, 0);

			




	
	
	
		
 
		_glUniform1i(this->remap_rgb_loc, 1);

			




	
	
	
		
 
	} else {

			




	
	
	
		
 
		_glUseProgram(BlitterFactory::GetCurrentBlitter()->GetScreenDepth() == 8 ? this->pal_program : this->vid_program);

			




	
	
	
		
 
	}

			




	
	
	
		
 
	_glBindVertexArray(this->vao_quad);

			




	
	
	
		
 
	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

			




	
	
	
		
 

			




	
	
		
 
@@ -815,6 +859,18 @@ void *OpenGLBackend::GetVideoBuffer()

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/**

			




	
	
	
		
 
 * Get a pointer to the memory for the separate animation buffer.

			




	
	
	
		
 
 * @return Pointer to draw on.

			




	
	
	
		
 
 */

			




	
	
	
		
 
uint8 *OpenGLBackend::GetAnimBuffer()

			




	
	
	
		
 
{

			




	
	
	
		
 
	if (this->anim_pbo == 0) return nullptr;

			




	
	
	
		
 

			




	
	
	
		
 
	_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->anim_pbo);

			




	
	
	
		
 
	return (uint8 *)_glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_READ_WRITE);

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/**

			




	
	
	
		
 
 * Update video buffer texture after the video buffer was filled.

			




	
	
	
		
 
 * @param update_rect Rectangle encompassing the dirty region of the video buffer.

			




	
	
	
		
 
 */

			




	
	
		
 
@@ -842,6 +898,26 @@ void OpenGLBackend::ReleaseVideoBuffer(c

			




	
	
	
		
 
	}

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/**

			




	
	
	
		
 
 * Update animation buffer texture after the animation buffer was filled.

			




	
	
	
		
 
 * @param update_rect Rectangle encompassing the dirty region of the animation buffer.

			




	
	
	
		
 
 */

			




	
	
	
		
 
void OpenGLBackend::ReleaseAnimBuffer(const Rect &update_rect)

			




	
	
	
		
 
{

			




	
	
	
		
 
	if (this->anim_pbo == 0) return;

			




	
	
	
		
 

			




	
	
	
		
 
	_glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->anim_pbo);

			




	
	
	
		
 
	_glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);

			




	
	
	
		
 

			




	
	
	
		
 
	/* Update changed rect of the video buffer texture. */

			




	
	
	
		
 
	if (update_rect.left != update_rect.right) {

			




	
	
	
		
 
		_glActiveTexture(GL_TEXTURE0);

			




	
	
	
		
 
		glBindTexture(GL_TEXTURE_2D, this->anim_texture);

			




	
	
	
		
 
		glPixelStorei(GL_UNPACK_ROW_LENGTH, _screen.pitch);

			




	
	
	
		
 
		glTexSubImage2D(GL_TEXTURE_2D, 0, update_rect.left, update_rect.top, update_rect.right - update_rect.left, update_rect.bottom - update_rect.top, GL_RED, GL_UNSIGNED_BYTE, (GLvoid *)(size_t)(update_rect.top * _screen.pitch + update_rect.left));

			




	
	
	
		
 
	}

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/* virtual */ Sprite *OpenGLBackend::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)

			




	
	
	
		
 
{

			




	
	
	
		
 
	/* Allocate and construct sprite data. */

			




        

    


    
    

    

        

                

                    src/video/opengl.h
                

                

                  
                      
                        

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@@ -39,6 +39,9 @@ private:

			




	
	
	
		
 
	GLuint vbo_quad;    ///< Vertex buffer with a fullscreen quad.

			




	
	
	
		
 
	GLuint pal_texture; ///< Palette lookup texture.

			




	
	
	
		
 

			




	
	
	
		
 
	GLuint anim_pbo;     ///< Pixel buffer object storing the memory used for the animation buffer.

			




	
	
	
		
 
	GLuint anim_texture; ///< Texture handle for the animation buffer texture.

			




	
	
	
		
 

			




	
	
	
		
 
	GLuint remap_program;    ///< Shader program for blending and rendering a RGBA + remap texture.

			




	
	
	
		
 
	GLint  remap_sprite_loc; ///< Uniform location for sprite parameters.

			




	
	
	
		
 
	GLint  remap_screen_loc; ///< Uniform location for screen size;

			




	
	
		
 
@@ -72,7 +75,9 @@ public:

			




	
	
	
		
 
	void ClearCursorCache();

			




	
	
	
		
 

			




	
	
	
		
 
	void *GetVideoBuffer();

			




	
	
	
		
 
	uint8 *GetAnimBuffer();

			




	
	
	
		
 
	void ReleaseVideoBuffer(const Rect &update_rect);

			




	
	
	
		
 
	void ReleaseAnimBuffer(const Rect &update_rect);

			




	
	
	
		
 

			




	
	
	
		
 
	/* SpriteEncoder */

			




	
	
	
		
 

			




        

    


    
    

    

        

                

                    src/video/video_driver.hpp
                

                

                  
                      
                        

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@@ -122,6 +122,24 @@ public:

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Does this video driver support a separate animation buffer in addition to the colour buffer?

			




	
	
	
		
 
	 * @return True if a separate animation buffer is supported.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	virtual bool HasAnimBuffer()

			




	
	
	
		
 
	{

			




	
	
	
		
 
		return false;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Get a pointer to the animation buffer of the video back-end.

			




	
	
	
		
 
	 * @return Pointer to the buffer or nullptr if no animation buffer is supported.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	virtual uint8 *GetAnimBuffer()

			




	
	
	
		
 
	{

			




	
	
	
		
 
		return nullptr;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * An edit box lost the input focus. Abort character compositing if necessary.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	virtual void EditBoxLostFocus() {}

			




        

    


    
    

    

        

                

                    src/video/win32_v.cpp
                

                

                  
                      
                        

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@@ -1545,14 +1545,19 @@ bool VideoDriver_Win32OpenGL::AllocateBa

			




	
	
	
		
 

			




	
	
	
		
 
void *VideoDriver_Win32OpenGL::GetVideoPointer()

			




	
	
	
		
 
{

			




	
	
	
		
 
	if (BlitterFactory::GetCurrentBlitter()->NeedsAnimationBuffer()) {

			




	
	
	
		
 
		this->anim_buffer = OpenGLBackend::Get()->GetAnimBuffer();

			




	
	
	
		
 
	}

			




	
	
	
		
 
	return OpenGLBackend::Get()->GetVideoBuffer();

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
void VideoDriver_Win32OpenGL::ReleaseVideoPointer()

			




	
	
	
		
 
{

			




	
	
	
		
 
	if (this->anim_buffer != nullptr) OpenGLBackend::Get()->ReleaseAnimBuffer(this->dirty_rect);

			




	
	
	
		
 
	OpenGLBackend::Get()->ReleaseVideoBuffer(this->dirty_rect);

			




	
	
	
		
 
	this->dirty_rect = {};

			




	
	
	
		
 
	_screen.dst_ptr = nullptr;

			




	
	
	
		
 
	this->anim_buffer = nullptr;

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
void VideoDriver_Win32OpenGL::Paint()

			




        

    


    
    

    

        

                

                    src/video/win32_v.h
                

                

                  
                      
                        

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@@ -128,7 +128,7 @@ public:

			




	
	
	
		
 
/** The OpenGL video driver for windows. */

			




	
	
	
		
 
class VideoDriver_Win32OpenGL : public VideoDriver_Win32Base {

			




	
	
	
		
 
public:

			




	
	
	
		
 
	VideoDriver_Win32OpenGL() : dc(nullptr), gl_rc(nullptr) {}

			




	
	
	
		
 
	VideoDriver_Win32OpenGL() : dc(nullptr), gl_rc(nullptr), anim_buffer(nullptr) {}

			




	
	
	
		
 

			




	
	
	
		
 
	const char *Start(const StringList &param) override;

			




	
	
	
		
 

			




	
	
		
 
@@ -144,12 +144,16 @@ public:

			




	
	
	
		
 

			




	
	
	
		
 
	void ClearSystemSprites() override;

			




	
	
	
		
 

			




	
	
	
		
 
	bool HasAnimBuffer() override { return true; }

			




	
	
	
		
 
	uint8 *GetAnimBuffer() override { return this->anim_buffer; }

			




	
	
	
		
 

			




	
	
	
		
 
	const char *GetName() const override { return "win32-opengl"; }

			




	
	
	
		
 

			




	
	
	
		
 
protected:

			




	
	
	
		
 
	HDC   dc;          ///< Window device context.

			




	
	
	
		
 
	HGLRC gl_rc;       ///< OpenGL context.

			




	
	
	
		
 
	bool  vsync;       ///< Enable VSync?

			




	
	
	
		
 
	HDC    dc;          ///< Window device context.

			




	
	
	
		
 
	HGLRC  gl_rc;       ///< OpenGL context.

			




	
	
	
		
 
	bool   vsync;       ///< Enable VSync?

			




	
	
	
		
 
	uint8 *anim_buffer; ///< Animation buffer from OpenGL back-end.

			




	
	
	
		
 

			




	
	
	
		
 
	uint8 GetFullscreenBpp() override { return 32; } // OpenGL is always 32 bpp.

			




	
	
	
		
 

			




        

    



    


    



    



      

      





    
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