From: Brian Date: Thu, 2 Aug 2007 18:14:05 +0000 (-0600) Subject: test glClear w/ scissor X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=65cc3d29a695a9059ec455026775bc24548c6b1a;p=mesa.git test glClear w/ scissor --- diff --git a/progs/trivial/clear-scissor.c b/progs/trivial/clear-scissor.c new file mode 100644 index 00000000000..5e2025bed74 --- /dev/null +++ b/progs/trivial/clear-scissor.c @@ -0,0 +1,118 @@ +/* + * glClear + glScissor + */ + +#include +#include +#include +#include + + +GLenum doubleBuffer; +GLint Width = 200, Height = 150; + +static void Init(void) +{ + fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); + fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); +} + +static void Reshape(int width, int height) +{ + Width = width; + Height = height; + + glViewport(0, 0, (GLint)width, (GLint)height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); + glMatrixMode(GL_MODELVIEW); +} + +static void Key(unsigned char key, int x, int y) +{ + switch (key) { + case 27: + exit(1); + default: + return; + } + glutPostRedisplay(); +} + +static void Draw(void) +{ + glEnable(GL_SCISSOR_TEST); + + glClearColor(1, 0, 0, 0); + glScissor(0, 0, Width / 2, Height / 2); + glClear(GL_COLOR_BUFFER_BIT); + + glClearColor(0, 1, 0, 0); + glScissor(Width / 2, 0, Width - Width / 2, Height / 2); + glClear(GL_COLOR_BUFFER_BIT); + + glClearColor(0, 0, 1, 0); + glScissor(0, Height / 2, Width / 2, Height - Height / 2); + glClear(GL_COLOR_BUFFER_BIT); + + glClearColor(1, 1, 1, 0); + glScissor(Width / 2, Height / 2, Width - Width / 2, Height - Height / 2); + glClear(GL_COLOR_BUFFER_BIT); + + glFlush(); + + if (doubleBuffer) { + glutSwapBuffers(); + } +} + +static GLenum Args(int argc, char **argv) +{ + GLint i; + + doubleBuffer = GL_FALSE; + + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-sb") == 0) { + doubleBuffer = GL_FALSE; + } else if (strcmp(argv[i], "-db") == 0) { + doubleBuffer = GL_TRUE; + } else { + fprintf(stderr, "%s (Bad option).\n", argv[i]); + return GL_FALSE; + } + } + return GL_TRUE; +} + +int main(int argc, char **argv) +{ + GLenum type; + + glutInit(&argc, argv); + + if (Args(argc, argv) == GL_FALSE) { + exit(1); + } + + glutInitWindowPosition(0, 0); glutInitWindowSize( Width, Height ); + + type = GLUT_RGB | GLUT_ALPHA; + type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; + glutInitDisplayMode(type); + + if (glutCreateWindow(argv[0]) == GL_FALSE) { + exit(1); + } + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +}