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This commit is contained in:
Brandon Dyck
2021-11-23 20:24:38 -07:00
commit 6120807f92
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368
lib/minifb/upstream/src/gl/MiniFB_GL.c Normal file
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#if defined(USE_OPENGL_API)
#include "MiniFB_GL.h"
#include "MiniFB_internal.h"
#if defined(_WIN32) || defined(WIN32)
#include <windows/WindowData_Win.h>
#include <gl/gl.h>
#elif defined(linux)
#include <x11/WindowData_X11.h>
#include <GL/gl.h>
#include <GL/glx.h>
#endif
#include <stdio.h>
#include <stdlib.h>
//#define kUse_Clean_UP
#if defined(kUse_Clean_UP)
#define UseCleanUp(x) x
#else
#define UseCleanUp(x)
#endif
extern double g_time_for_frame;
extern bool g_use_hardware_sync;
//-------------------------------------
#if defined(_WIN32) || defined(WIN32)
bool
setup_pixel_format(HDC hDC) {
int pixelFormat;
PIXELFORMATDESCRIPTOR pfd = {
sizeof(PIXELFORMATDESCRIPTOR), // size
1, // version
PFD_SUPPORT_OPENGL | //
PFD_DRAW_TO_WINDOW | //
PFD_DOUBLEBUFFER, // support double-buffering
PFD_TYPE_RGBA, // color type
24, // preferred color depth
0, 0, 0, 0, 0, 0, // color and shift bits (ignored)
0, // no alpha buffer
0, // alpha bits (ignored)
0, // no accumulation buffer
0, 0, 0, 0, // accum bits (ignored)
24, // depth buffer
8, // no stencil buffer
0, // no auxiliary buffers
PFD_MAIN_PLANE, // main layer
0, // reserved
0, 0, 0, // no layer, visible, damage masks
};
pixelFormat = ChoosePixelFormat(hDC, &pfd);
if (pixelFormat == 0) {
MessageBox(WindowFromDC(hDC), "ChoosePixelFormat failed.", "Error", MB_ICONERROR | MB_OK);
return false;
}
if (SetPixelFormat(hDC, pixelFormat, &pfd) != TRUE) {
MessageBox(WindowFromDC(hDC), "SetPixelFormat failed.", "Error", MB_ICONERROR | MB_OK);
return false;
}
return true;
}
typedef BOOL (WINAPI * PFNWGLSWAPINTERVALEXTPROC)(int);
typedef int (WINAPI * PFNWGLGETSWAPINTERVALEXTPROC)(void);
PFNWGLSWAPINTERVALEXTPROC SwapIntervalEXT = 0x0;
PFNWGLGETSWAPINTERVALEXTPROC GetSwapIntervalEXT = 0x0;
#elif defined(linux)
bool
setup_pixel_format(SWindowData_X11 *window_data_x11) {
GLint glxAttribs[] = {
GLX_RGBA,
GLX_DOUBLEBUFFER,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_DEPTH_SIZE, 24,
GLX_STENCIL_SIZE, 8,
GLX_SAMPLE_BUFFERS, 0,
GLX_SAMPLES, 0,
None
};
XVisualInfo* visualInfo = glXChooseVisual(window_data_x11->display, window_data_x11->screen, glxAttribs);
if (visualInfo == 0) {
fprintf(stderr, "Could not create correct visual window.\n");
XCloseDisplay(window_data_x11->display);
return false;
}
window_data_x11->context = glXCreateContext(window_data_x11->display, visualInfo, NULL, GL_TRUE);
return true;
}
typedef void (*PFNGLXSWAPINTERVALEXTPROC)(Display*,GLXDrawable,int);
PFNGLXSWAPINTERVALEXTPROC SwapIntervalEXT = 0x0;
#endif
//-------------------------------------
bool
create_GL_context(SWindowData *window_data) {
#if defined(_WIN32) || defined(WIN32)
SWindowData_Win *window_data_win = (SWindowData_Win *) window_data->specific;
if (setup_pixel_format(window_data_win->hdc) == false)
return false;
window_data_win->hGLRC = wglCreateContext(window_data_win->hdc);
wglMakeCurrent(window_data_win->hdc, window_data_win->hGLRC);
init_GL(window_data);
SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) wglGetProcAddress("wglSwapIntervalEXT");
GetSwapIntervalEXT = (PFNWGLGETSWAPINTERVALEXTPROC) wglGetProcAddress("wglGetSwapIntervalEXT");
set_target_fps_aux();
return true;
#elif defined(linux)
SWindowData_X11 *window_data_x11 = (SWindowData_X11 *) window_data->specific;
GLint majorGLX, minorGLX = 0;
glXQueryVersion(window_data_x11->display, &majorGLX, &minorGLX);
if (majorGLX <= 1 && minorGLX < 2) {
fprintf(stderr, "GLX 1.2 or greater is required.\n");
XCloseDisplay(window_data_x11->display);
return false;
}
else {
//fprintf(stdout, "GLX version: %d.%d\n", majorGLX, minorGLX);
}
if (setup_pixel_format(window_data_x11) == false)
return false;
glXMakeCurrent(window_data_x11->display, window_data_x11->window, window_data_x11->context);
//fprintf(stdout, "GL Vendor: %s\n", glGetString(GL_VENDOR));
//fprintf(stdout, "GL Renderer: %s\n", glGetString(GL_RENDERER));
//fprintf(stdout, "GL Version: %s\n", glGetString(GL_VERSION));
//fprintf(stdout, "GL Shading Language: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION));
init_GL(window_data);
SwapIntervalEXT = (PFNGLXSWAPINTERVALEXTPROC) glXGetProcAddress("glXSwapIntervalEXT");
set_target_fps_aux();
return true;
#endif
}
//-------------------------------------
void
destroy_GL_context(SWindowData *window_data) {
#if defined(_WIN32) || defined(WIN32)
SWindowData_Win *window_data_win = (SWindowData_Win *) window_data->specific;
if (window_data_win->hGLRC) {
wglMakeCurrent(NULL, NULL);
wglDeleteContext(window_data_win->hGLRC);
window_data_win->hGLRC = 0;
}
#elif defined(linux)
SWindowData_X11 *window_data_x11 = (SWindowData_X11 *) window_data->specific;
glXDestroyContext(window_data_x11->display, window_data_x11->context);
#endif
}
//-------------------------------------
#if defined(RGB)
#undef RGB
#endif
#define TEXTURE0 0x84C0 // [ Core in gl 1.3, gles1 1.0, gles2 2.0, glsc2 2.0, Provided by GL_ARB_multitexture (gl) ]
#define RGB 0x1907 // [ Core in gl 1.0, gles1 1.0, gles2 2.0, glsc2 2.0 ]
#define RGBA 0x1908 // [ Core in gl 1.0, gles1 1.0, gles2 2.0, glsc2 2.0 ]
#define BGR 0x80E0 // [ Core in gl 1.2 ]
#define BGRA 0x80E1 // [ Core in gl 1.2, Provided by GL_ARB_vertex_array_bgra (gl|glcore) ]
//-------------------------------------
void
init_GL(SWindowData *window_data) {
#if defined(_WIN32) || defined(WIN32)
SWindowData_Win *window_data_ex = (SWindowData_Win *) window_data->specific;
#elif defined(linux)
SWindowData_X11 *window_data_ex = (SWindowData_X11 *) window_data->specific;
#endif
glViewport(0, 0, window_data->window_width, window_data->window_height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, window_data->window_width, window_data->window_height, 0, 2048, -2048);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDisable(GL_DEPTH_TEST);
glDisable(GL_STENCIL_TEST);
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &window_data_ex->text_id);
//glActiveTexture(TEXTURE0);
glBindTexture(GL_TEXTURE_2D, window_data_ex->text_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
UseCleanUp(glDisableClientState(GL_TEXTURE_COORD_ARRAY));
UseCleanUp(glDisableClientState(GL_VERTEX_ARRAY));
UseCleanUp(glBindTexture(GL_TEXTURE_2D, 0));
}
//-------------------------------------
void
resize_GL(SWindowData *window_data) {
if (window_data->is_initialized) {
#if defined(_WIN32) || defined(WIN32)
SWindowData_Win *window_data_ex = (SWindowData_Win *) window_data->specific;
wglMakeCurrent(window_data_ex->hdc, window_data_ex->hGLRC);
#elif defined(linux)
SWindowData_X11 *window_data_ex = (SWindowData_X11 *) window_data->specific;
glXMakeCurrent(window_data_ex->display, window_data_ex->window, window_data_ex->context);
#endif
glViewport(0, 0, window_data->window_width, window_data->window_height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, window_data->window_width, window_data->window_height, 0, 2048, -2048);
glClear(GL_COLOR_BUFFER_BIT);
}
}
//-------------------------------------
void
redraw_GL(SWindowData *window_data, const void *pixels) {
#if defined(_WIN32) || defined(WIN32)
SWindowData_Win *window_data_ex = (SWindowData_Win *) window_data->specific;
GLenum format = BGRA;
wglMakeCurrent(window_data_ex->hdc, window_data_ex->hGLRC);
#elif defined(linux)
SWindowData_X11 *window_data_ex = (SWindowData_X11 *) window_data->specific;
GLenum format = BGRA;
glXMakeCurrent(window_data_ex->display, window_data_ex->window, window_data_ex->context);
#endif
float x, y, w, h;
x = (float) window_data->dst_offset_x;
y = (float) window_data->dst_offset_y;
w = (float) window_data->dst_offset_x + window_data->dst_width;
h = (float) window_data->dst_offset_y + window_data->dst_height;
float vertices[] = {
x, y,
0, 0,
w, y,
1, 0,
x, h,
0, 1,
w, h,
1, 1,
};
glClear(GL_COLOR_BUFFER_BIT);
UseCleanUp(glBindTexture(GL_TEXTURE_2D, window_data_ex->text_id));
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, window_data->buffer_width, window_data->buffer_height, 0, format, GL_UNSIGNED_BYTE, pixels);
//glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, window_data->buffer_width, window_data->buffer_height, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
UseCleanUp(glEnableClientState(GL_VERTEX_ARRAY));
UseCleanUp(glEnableClientState(GL_TEXTURE_COORD_ARRAY));
glVertexPointer(2, GL_FLOAT, 4 * sizeof(float), vertices);
glTexCoordPointer(2, GL_FLOAT, 4 * sizeof(float), vertices + 2);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
UseCleanUp(glDisableClientState(GL_TEXTURE_COORD_ARRAY));
UseCleanUp(glDisableClientState(GL_VERTEX_ARRAY));
UseCleanUp(glBindTexture(GL_TEXTURE_2D, 0));
#if defined(_WIN32) || defined(WIN32)
SwapBuffers(window_data_ex->hdc);
#elif defined(linux)
glXSwapBuffers(window_data_ex->display, window_data_ex->window);
#endif
}
//-------------------------------------
void
set_target_fps_aux() {
// Assuming the monitor refresh rate is 60 hz
int interval = (int) ((60.0 * g_time_for_frame) + 0.5);
#if defined(_WIN32) || defined(WIN32)
if (SwapIntervalEXT != 0x0) {
bool success = SwapIntervalEXT(interval);
if (GetSwapIntervalEXT != 0x0) {
int currentInterval = GetSwapIntervalEXT();
if (interval != currentInterval) {
fprintf(stderr, "Cannot set target swap interval. Current swap interval is %d\n", currentInterval);
}
}
else if (success == false) {
fprintf(stderr, "Cannot set target swap interval.\n");
}
g_use_hardware_sync = true;
}
#elif defined(linux)
#define kGLX_SWAP_INTERVAL_EXT 0x20F1
#define kGLX_MAX_SWAP_INTERVAL_EXT 0x20F2
if (SwapIntervalEXT != 0x0) {
Display *dpy = glXGetCurrentDisplay();
GLXDrawable drawable = glXGetCurrentDrawable();
unsigned int currentInterval, maxInterval;
SwapIntervalEXT(dpy, drawable, interval);
glXQueryDrawable(dpy, drawable, kGLX_SWAP_INTERVAL_EXT, &currentInterval);
if (interval != currentInterval) {
glXQueryDrawable(dpy, drawable, kGLX_MAX_SWAP_INTERVAL_EXT, &maxInterval);
fprintf(stderr, "Cannot set target swap interval. Current swap interval is %d (max: %d)\n", currentInterval, maxInterval);
}
g_use_hardware_sync = true;
}
#endif
}
#endif

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lib/minifb/upstream/src/gl/MiniFB_GL.h Normal file
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#pragma once
#if defined(USE_OPENGL_API)
#include <WindowData.h>
bool create_GL_context(SWindowData *window_data);
void destroy_GL_context(SWindowData *window_data);
void init_GL(SWindowData *window_data);
void redraw_GL(SWindowData *window_data, const void *pixels);
void resize_GL(SWindowData *window_data);
#endif