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Add glew, defines for width/height

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This commit is contained in:
Peter Evans 2017-12-17 19:09:54 -06:00
parent a73c15c37c
commit 83dcfaf646
3 changed files with 34 additions and 2 deletions
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2
CMakeLists.txt
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@ -27,4 +27,4 @@ link_directories(/usr/local/lib)
add_executable(erc ${sources} src/main.c) add_executable(erc ${sources} src/main.c)
# Graphics # Graphics
target_link_libraries(erc ${opengl_library} glfw) target_link_libraries(erc ${opengl_library} glfw GLEW)

4
include/vm_screen.h
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@ -1,9 +1,13 @@
#ifndef _VM_SCREEN_H_ #ifndef _VM_SCREEN_H_
#define _VM_SCREEN_H_ #define _VM_SCREEN_H_
#include <GL/glew.h>
#include <GLFW/glfw3.h> #include <GLFW/glfw3.h>
#include <stdbool.h> #include <stdbool.h>
#define VM_SCREEN_DEFWIDTH 800
#define VM_SCREEN_DEFHEIGHT 600
/* /*
* If you just want to plot a single pixel, you can use this macro to * If you just want to plot a single pixel, you can use this macro to
* abstract away the need to indicate the x/y dimensions (as those must * abstract away the need to indicate the x/y dimensions (as those must

30
src/vm_screen.c
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@ -6,11 +6,25 @@
* program, which only knows to call the functions here. * program, which only knows to call the functions here.
*/ */
#include <stdbool.h>
#include <stdlib.h> #include <stdlib.h>
#include "log.h" #include "log.h"
#include "vm_screen.h" #include "vm_screen.h"
static bool init_glew = false;
static void
glew_init()
{
if (!init_glew) {
glewExperimental = GL_TRUE;
glewInit();
init_glew = true;
}
}
int int
vm_screen_init() vm_screen_init()
{ {
@ -18,6 +32,13 @@ vm_screen_init()
return ERR_GFXINIT; return ERR_GFXINIT;
} }
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
return OK; return OK;
} }
@ -48,7 +69,10 @@ vm_screen_create()
int int
vm_screen_add_window(vm_screen *screen) vm_screen_add_window(vm_screen *screen)
{ {
screen->window = glfwCreateWindow(320, 240, "erc", NULL, NULL); screen->window = glfwCreateWindow(VM_SCREEN_DEFWIDTH,
VM_SCREEN_DEFHEIGHT,
"erc", NULL, NULL);
if (screen->window == NULL) { if (screen->window == NULL) {
log_critical("Could not create a window"); log_critical("Could not create a window");
return ERR_GFXINIT; return ERR_GFXINIT;
@ -56,6 +80,10 @@ vm_screen_add_window(vm_screen *screen)
glfwMakeContextCurrent(screen->window); glfwMakeContextCurrent(screen->window);
// glew can only be initialized _after_ the window is built; if you
// do so beforehand, you will be rudely presented with a segfault.
glew_init();
return OK; return OK;
} }