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LookingGlass/client/renderers/opengl.c

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#include "lg-renderer.h"
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <SDL_ttf.h>
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glx.h>
#include "debug.h"
#include "memcpySSE.h"
#include "utils.h"
#define VBO_BUFFERS 2
#define FPS_TEXTURE (VBO_BUFFERS )
#define MOUSE_TEXTURE (VBO_BUFFERS+1)
#define TEXTURE_COUNT (VBO_BUFFERS+2)
static PFNGLXGETVIDEOSYNCSGIPROC glXGetVideoSyncSGI = NULL;
static PFNGLXWAITVIDEOSYNCSGIPROC glXWaitVideoSyncSGI = NULL;
struct LGR_OpenGL
{
LG_RendererParams params;
bool initialized;
SDL_GLContext glContext;
bool resizeWindow;
bool frameUpdate;
LG_RendererFormat format;
GLuint intFormat;
GLuint vboFormat;
size_t texSize;
uint64_t drawStart;
bool hasBuffers;
GLuint vboID[VBO_BUFFERS];
uint8_t * texPixels[VBO_BUFFERS];
int texIndex;
int texList;
int fpsList;
int mouseList;
LG_RendererRect destRect;
bool hasTextures;
GLuint textures[TEXTURE_COUNT];
uint gpuFrameCount;
bool fpsTexture;
uint64_t lastFrameTime;
uint64_t renderTime;
uint64_t frameCount;
SDL_Rect fpsRect;
bool mouseUpdate;
uint64_t lastMouseDraw;
LG_RendererCursor mouseType;
bool mouseRepair;
SDL_Rect mouseRepairPos;
bool mouseVisible;
SDL_Rect mousePos;
};
bool lgr_opengl_check_error(const char * name)
{
GLenum error = glGetError();
if (error == GL_NO_ERROR)
return false;
const GLubyte * errStr = gluErrorString(error);
DEBUG_ERROR("%s = %d (%s)", name, error, errStr);
return true;
}
const char * lgr_opengl_get_name()
{
return "OpenGL";
}
bool lgr_opengl_initialize(void ** opaque, const LG_RendererParams params, const LG_RendererFormat format)
{
// create our local storage
*opaque = malloc(sizeof(struct LGR_OpenGL));
if (!*opaque)
{
DEBUG_INFO("Failed to allocate %lu bytes", sizeof(struct LGR_OpenGL));
return false;
}
memset(*opaque, 0, sizeof(struct LGR_OpenGL));
struct LGR_OpenGL * this = (struct LGR_OpenGL *)*opaque;
memcpy(&this->params, &params, sizeof(LG_RendererParams));
this->glContext = SDL_GL_CreateContext(params.window);
if (!this->glContext)
{
DEBUG_ERROR("Failed to create the OpenGL context");
return false;
}
if (SDL_GL_MakeCurrent(params.window, this->glContext) != 0)
{
DEBUG_ERROR("Failed to make the GL context current");
return false;
}
DEBUG_INFO("Vendor : %s", glGetString(GL_VENDOR ));
DEBUG_INFO("Renderer: %s", glGetString(GL_RENDERER));
DEBUG_INFO("Version : %s", glGetString(GL_VERSION ));
if (!glXGetVideoSyncSGI)
{
glXGetVideoSyncSGI = (PFNGLXGETVIDEOSYNCSGIPROC )glXGetProcAddress((const GLubyte *)"glXGetVideoSyncSGI" );
glXWaitVideoSyncSGI = (PFNGLXWAITVIDEOSYNCSGIPROC)glXGetProcAddress((const GLubyte *)"glXWaitVideoSyncSGI");
if (!glXGetVideoSyncSGI || !glXWaitVideoSyncSGI)
{
glXGetVideoSyncSGI = NULL;
DEBUG_ERROR("Failed to get proc addresses");
return false;
}
}
SDL_GL_SetSwapInterval(0);
// check if the GPU supports GL_ARB_buffer_storage first
// there is no advantage to this renderer if it is not present.
const GLubyte * extensions = glGetString(GL_EXTENSIONS);
if (!gluCheckExtension((const GLubyte *)"GL_ARB_buffer_storage", extensions))
{
DEBUG_INFO("The GPU doesn't support GL_ARB_buffer_storage");
return false;
}
// assume 24 and 32 bit formats are RGB and RGBA
switch(format.bpp)
{
case 24:
this->intFormat = GL_RGB8;
this->vboFormat = GL_BGR;
break;
case 32:
this->intFormat = GL_RGBA8;
this->vboFormat = GL_BGRA;
break;
default:
DEBUG_INFO("%d bpp not supported", format.bpp);
return false;
}
// calculate the texture size in bytes
this->texSize = format.height * format.pitch;
// generate lists for drawing
this->texList = glGenLists(2);
this->fpsList = glGenLists(1);
this->mouseList = glGenLists(1);
// generate the pixel unpack buffers
glGenBuffers(VBO_BUFFERS, this->vboID);
if (lgr_opengl_check_error("glGenBuffers"))
return false;
this->hasBuffers = true;
// persistant bind the buffers
for (int i = 0; i < VBO_BUFFERS; ++i)
{
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vboID[i]);
if (lgr_opengl_check_error("glBindBuffer"))
return false;
glBufferStorage(GL_PIXEL_UNPACK_BUFFER, this->texSize, 0, GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT);
if (lgr_opengl_check_error("glBufferStorage"))
return false;
this->texPixels[i] = glMapBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, this->texSize,
GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT | GL_MAP_FLUSH_EXPLICIT_BIT);
if (lgr_opengl_check_error("glMapBufferRange"))
return false;
if (!this->texPixels[i])
{
DEBUG_ERROR("Failed to map the buffer range");
return false;
}
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
}
// create the textures
glGenTextures(TEXTURE_COUNT, this->textures);
if (lgr_opengl_check_error("glGenTextures"))
return false;
this->hasTextures = true;
// bind the textures to the unpack buffers
for (int i = 0; i < VBO_BUFFERS; ++i)
{
glBindTexture(GL_TEXTURE_2D, this->textures[i]);
if (lgr_opengl_check_error("glBindTexture"))
return false;
glTexImage2D(
GL_TEXTURE_2D,
0,
this->intFormat,
format.width, format.height,
0,
this->vboFormat,
GL_UNSIGNED_BYTE,
(void*)0
);
if (lgr_opengl_check_error("glTexImage2D"))
return false;
// create the display lists
glNewList(this->texList + i, GL_COMPILE);
glBindTexture(GL_TEXTURE_2D, this->textures[i]);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f, 0.0f); glVertex2i(0 , 0 );
glTexCoord2f(1.0f, 0.0f); glVertex2i(format.width, 0 );
glTexCoord2f(0.0f, 1.0f); glVertex2i(0 , format.height);
glTexCoord2f(1.0f, 1.0f); glVertex2i(format.width, format.height);
glEnd();
glEndList();
if (lgr_opengl_check_error("glTexImage2D"))
return false;
}
glBindTexture(GL_TEXTURE_2D, 0);
glEnable(GL_TEXTURE_2D);
glEnable(GL_COLOR_MATERIAL);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBlendEquation(GL_FUNC_ADD);
glEnable(GL_SCISSOR_TEST);
this->resizeWindow = true;
this->drawStart = nanotime();
glXGetVideoSyncSGI(&this->gpuFrameCount);
// copy the format into the local storage
memcpy(&this->format, &format, sizeof(LG_RendererFormat));
this->initialized = true;
return true;
}
void lgr_opengl_deinitialize(void * opaque)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this)
return;
if (this->hasTextures)
glDeleteTextures(VBO_BUFFERS, this->textures);
if (this->hasBuffers)
glDeleteBuffers(VBO_BUFFERS, this->vboID);
if (this->glContext)
SDL_GL_DeleteContext(this->glContext);
free(this);
}
bool lgr_opengl_is_compatible(void * opaque, const LG_RendererFormat format)
{
const struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return false;
return (memcmp(&this->format, &format, sizeof(LG_RendererFormat)) == 0);
}
void lgr_opengl_on_resize(void * opaque, const int width, const int height, const LG_RendererRect destRect)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return;
this->params.width = width;
this->params.height = height;
memcpy(&this->destRect, &destRect, sizeof(LG_RendererRect));
this->resizeWindow = true;
}
bool lgr_opengl_on_mouse_shape(void * opaque, const LG_RendererCursor cursor, const int width, const int height, const int pitch, const uint8_t * data)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return false;
this->mouseType = cursor;
switch(cursor)
{
case LG_CURSOR_COLOR:
{
glBindTexture(GL_TEXTURE_2D, this->textures[MOUSE_TEXTURE]);
glPixelStorei(GL_UNPACK_ALIGNMENT , 4 );
glPixelStorei(GL_UNPACK_ROW_LENGTH, width);
glTexImage2D
(
GL_TEXTURE_2D,
0 ,
GL_RGBA,
width ,
height ,
0 ,
GL_RGBA,
GL_UNSIGNED_BYTE,
data
);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
this->mousePos.w = width;
this->mousePos.h = height;
glNewList(this->mouseList, GL_COMPILE);
glEnable(GL_BLEND);
glBindTexture(GL_TEXTURE_2D, this->textures[MOUSE_TEXTURE]);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f, 0.0f); glVertex2i(0 , 0 );
glTexCoord2f(1.0f, 0.0f); glVertex2i(width, 0 );
glTexCoord2f(0.0f, 1.0f); glVertex2i(0 , height);
glTexCoord2f(1.0f, 1.0f); glVertex2i(width, height);
glEnd();
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_BLEND);
glEndList();
break;
}
case LG_CURSOR_MONOCHROME:
{
const int hheight = height / 2;
uint32_t d[width * height];
for(int y = 0; y < hheight; ++y)
for(int x = 0; x < width; ++x)
{
const uint8_t * srcAnd = data + (pitch * y) + (x / 8);
const uint8_t * srcXor = srcAnd + pitch * hheight;
const uint8_t mask = 0x80 >> (x % 8);
const uint32_t andMask = (*srcAnd & mask) ? 0xFFFFFFFF : 0xFF000000;
const uint32_t xorMask = (*srcXor & mask) ? 0x00FFFFFF : 0x00000000;
d[y * width + x ] = andMask;
d[y * width + x + width * hheight] = xorMask;
}
glBindTexture(GL_TEXTURE_2D, this->textures[MOUSE_TEXTURE]);
glPixelStorei(GL_UNPACK_ALIGNMENT , 4 );
glPixelStorei(GL_UNPACK_ROW_LENGTH, width);
glTexImage2D
(
GL_TEXTURE_2D,
0 ,
GL_RGBA,
width ,
height ,
0 ,
GL_RGBA,
GL_UNSIGNED_BYTE,
d
);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
this->mousePos.w = width;
this->mousePos.h = hheight;
glNewList(this->mouseList, GL_COMPILE);
glEnable(GL_COLOR_LOGIC_OP);
glBindTexture(GL_TEXTURE_2D, this->textures[MOUSE_TEXTURE]);
glLogicOp(GL_AND);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f, 0.0f); glVertex2i(0 , 0 );
glTexCoord2f(1.0f, 0.0f); glVertex2i(width, 0 );
glTexCoord2f(0.0f, 0.5f); glVertex2i(0 , hheight);
glTexCoord2f(1.0f, 0.5f); glVertex2i(width, hheight);
glEnd();
glLogicOp(GL_XOR);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f, 0.5f); glVertex2i(0 , 0 );
glTexCoord2f(1.0f, 0.5f); glVertex2i(width, 0 );
glTexCoord2f(0.0f, 1.0f); glVertex2i(0 , hheight);
glTexCoord2f(1.0f, 1.0f); glVertex2i(width, hheight);
glEnd();
glDisable(GL_COLOR_LOGIC_OP);
glEndList();
break;
}
case LG_CURSOR_MASKED_COLOR:
{
//TODO
break;
}
}
this->mouseUpdate = true;
return true;
}
bool lgr_opengl_on_mouse_event(void * opaque, const bool visible, const int x, const int y)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return false;
if (this->mousePos.x == x && this->mousePos.y == y && this->mouseVisible == visible)
return true;
this->mouseVisible = visible;
this->mousePos.x = x;
this->mousePos.y = y;
this->mouseUpdate = true;
return false;
}
bool lgr_opengl_on_frame_event(void * opaque, const uint8_t * data, bool resample)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return false;
int texIndex = this->texIndex + 1;
if (texIndex == VBO_BUFFERS)
texIndex = 0;
if (this->params.showFPS && this->renderTime > 1e9)
{
char str[128];
const float avgFPS = 1000.0f / (((float)this->renderTime / this->frameCount) / 1e6f);
snprintf(str, sizeof(str), "FPS: %8.4f", avgFPS);
SDL_Color color = {0xff, 0xff, 0xff};
SDL_Surface *textSurface = NULL;
if (!(textSurface = TTF_RenderText_Blended(this->params.font, str, color)))
{
DEBUG_ERROR("Failed to render text");
return false;
}
glBindTexture(GL_TEXTURE_2D , this->textures[VBO_BUFFERS]);
glPixelStorei(GL_UNPACK_ALIGNMENT , 4 );
glPixelStorei(GL_UNPACK_ROW_LENGTH, textSurface->w );
glTexImage2D(
GL_TEXTURE_2D,
0,
textSurface->format->BytesPerPixel,
textSurface->w,
textSurface->h,
0,
GL_BGRA,
GL_UNSIGNED_BYTE,
textSurface->pixels
);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
this->fpsRect.x = 5;
this->fpsRect.y = 5;
this->fpsRect.w = textSurface->w;
this->fpsRect.h = textSurface->h;
SDL_FreeSurface(textSurface);
this->renderTime = 0;
this->frameCount = 0;
this->fpsTexture = true;
glNewList(this->fpsList, GL_COMPILE);
glEnable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
glColor4f(0.0f, 0.0f, 1.0f, 0.5f);
glBegin(GL_TRIANGLE_STRIP);
glVertex2i(this->fpsRect.x , this->fpsRect.y );
glVertex2i(this->fpsRect.x + this->fpsRect.w, this->fpsRect.y );
glVertex2i(this->fpsRect.x , this->fpsRect.y + this->fpsRect.h);
glVertex2i(this->fpsRect.x + this->fpsRect.w, this->fpsRect.y + this->fpsRect.h);
glEnd();
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, this->textures[VBO_BUFFERS]);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f , 0.0f); glVertex2i(this->fpsRect.x , this->fpsRect.y );
glTexCoord2f(1.0f , 0.0f); glVertex2i(this->fpsRect.x + this->fpsRect.w, this->fpsRect.y );
glTexCoord2f(0.0f , 1.0f); glVertex2i(this->fpsRect.x , this->fpsRect.y + this->fpsRect.h);
glTexCoord2f(1.0f, 1.0f); glVertex2i(this->fpsRect.x + this->fpsRect.w, this->fpsRect.y + this->fpsRect.h);
glEnd();
glDisable(GL_BLEND);
glEndList();
}
// copy the buffer to the texture
memcpySSE(this->texPixels[texIndex], data, this->texSize);
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, this->vboID[texIndex]);
glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, this->texSize);
// bind the texture and update it
glBindTexture(GL_TEXTURE_2D , this->textures[texIndex]);
glPixelStorei(GL_UNPACK_ALIGNMENT , 4 );
glPixelStorei(GL_UNPACK_ROW_LENGTH , this->format.width );
// update the texture
glTexSubImage2D(
GL_TEXTURE_2D,
0,
0, 0,
this->format.width ,
this->format.height,
this->vboFormat,
GL_UNSIGNED_BYTE,
(void*)0
);
const bool mipmap = resample && (
(this->format.width > this->destRect.w) ||
(this->format.height > this->destRect.h));
// unbind the buffer
glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
// configure the texture
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
if (mipmap)
{
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
}
else
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
}
this->frameUpdate = true;
this->texIndex = texIndex;
return true;
}
inline void lgr_opengl_draw_mouse(struct LGR_OpenGL * this)
{
if (!this->mouseVisible)
return;
memcpy(&this->mouseRepairPos, &this->mousePos, sizeof(SDL_Rect));
this->mouseRepair = true;
glPushMatrix();
glTranslatef(this->mouseRepairPos.x, this->mouseRepairPos.y, 0.0f);
glCallList(this->mouseList);
glPopMatrix();
}
bool lgr_opengl_render(void * opaque)
{
struct LGR_OpenGL * this = (struct LGR_OpenGL *)opaque;
if (!this || !this->initialized)
return false;
if (this->resizeWindow)
{
// setup the projection matrix
glViewport(0, 0, this->params.width, this->params.height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0, this->params.width, this->params.height, 0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(this->destRect.x, this->destRect.y, 0.0f);
glScalef(
(float)this->destRect.w / (float)this->format.width,
(float)this->destRect.h / (float)this->format.height,
1.0f
);
// update the scissor rect to prevent drawing outside of the frame
glScissor(
this->destRect.x,
this->destRect.y,
this->destRect.w,
this->destRect.h
);
this->resizeWindow = false;
glDisable(GL_SCISSOR_TEST);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
}
if (!this->frameUpdate)
{
if (!this->mouseUpdate)
return true;
// don't update the mouse too fast
const uint64_t delta = nanotime() - this->lastMouseDraw;
if (delta < 1e7)
return true;
glCallList(this->texList + this->texIndex);
lgr_opengl_draw_mouse(this);
glFinish();
this->mouseUpdate = false;
this->lastMouseDraw = nanotime();
}
else
{
glDrawBuffer(GL_BACK);
glCallList(this->texList + this->texIndex);
lgr_opengl_draw_mouse(this);
if (this->fpsTexture)
glCallList(this->fpsList);
glDrawBuffer(GL_FRONT);
unsigned int count;
glXGetVideoSyncSGI(&count);
if (count == this->gpuFrameCount)
glXWaitVideoSyncSGI(1, 0, &count);
SDL_GL_SwapWindow(this->params.window);
glXGetVideoSyncSGI(&this->gpuFrameCount);
}
++this->frameCount;
const uint64_t t = nanotime();
this->renderTime += t - this->lastFrameTime;
this->lastFrameTime = t;
this->frameUpdate = false;
this->mouseUpdate = false;
this->lastMouseDraw = t;
return true;
}
const LG_Renderer LGR_OpenGL =
{
.get_name = lgr_opengl_get_name,
.initialize = lgr_opengl_initialize,
.deinitialize = lgr_opengl_deinitialize,
.is_compatible = lgr_opengl_is_compatible,
.on_resize = lgr_opengl_on_resize,
.on_mouse_shape = lgr_opengl_on_mouse_shape,
.on_mouse_event = lgr_opengl_on_mouse_event,
.on_frame_event = lgr_opengl_on_frame_event,
.render = lgr_opengl_render
};
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