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Support of FLTK widgets in OpenGL 3 windows - cont'd.

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This commit allows to switch between FL_DOUBLE / FL_SINGLE modes
in widget-containing GL3 windows.
Demo program examples/OpenGL3test is modified to show FLTK widgets
even if the platform does not support OpenGL 3.
This commit is contained in:
ManoloFLTK
2022-09-29 09:39:21 +02:00
parent 283184a09a
commit da66e21e1d
4 changed files with 24 additions and 14 deletions
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22
examples/OpenGL3test.cxx
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@@ -30,7 +30,7 @@
# endif
# include <GL/glew.h>
#endif
#include <FL/gl.h> // for gl_texture_reset()
void add_output(const char *format, ...);
@@ -50,8 +50,7 @@ public:
gl_version_major = 0;
}
void draw(void) {
if (gl_version_major < 3) return;
if (!shaderProgram) {
if (gl_version_major >= 3 && !shaderProgram) {
GLuint vs;
GLuint fs;
int Mslv, mslv; // major and minor version numbers of the shading language
@@ -135,9 +134,11 @@ public:
}
glClearColor(0.08, 0.8, 0.8, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
GLfloat p[]={0,0};
glUniform2fv(positionUniform, 1, (const GLfloat *)&p);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
if (shaderProgram) {
GLfloat p[]={0,0};
glUniform2fv(positionUniform, 1, (const GLfloat *)&p);
glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
}
Fl_Gl_Window::draw(); // Draw FLTK child widgets.
}
virtual int handle(int event) {
@@ -158,7 +159,12 @@ public:
const uchar *glv = glGetString(GL_VERSION);
add_output("GL_VERSION=%s\n", glv);
sscanf((const char *)glv, "%d", &gl_version_major);
if (gl_version_major < 3) add_output("\nThis platform does not support OpenGL V3\n\n");
if (gl_version_major < 3) {
add_output("\nThis platform does not support OpenGL V3 :\n"
"FLTK widgets will appear but the programmed "
"rendering pipeline will not run.\n");
mode(mode() & !FL_OPENGL3);
}
redraw();
}
@@ -181,7 +187,7 @@ public:
}
return retval;
}
void reset(void) { shaderProgram = 0; }
void reset(void) { shaderProgram = 0; gl_texture_reset(); }
};