diff options
Diffstat (limited to 'progs/tests/calibrate_rast.c')
-rw-r--r-- | progs/tests/calibrate_rast.c | 397 |
1 files changed, 0 insertions, 397 deletions
diff --git a/progs/tests/calibrate_rast.c b/progs/tests/calibrate_rast.c deleted file mode 100644 index 5d89ff79c55..00000000000 --- a/progs/tests/calibrate_rast.c +++ /dev/null @@ -1,397 +0,0 @@ -/* - * Automatic primitive rasterization precision test. - * - * Draw prims at various sub-pixel offsets and examine where the quad is - * actually drawn. - * Check if the range of offsets which paint the right pixels falls within - * OpenGL's specification. - * In case of failures, report the coordinate bias needed to fix the problem. - * - * Note that even Mesa/swrast fails some line tests. This is because some - * window coordinates wind up as 53.9999 instead of 54, for example. Enabling - * the small translation factor below fixes that. Revisit someday... - * - * Brian Paul - * 28 Feb 2008 - */ - - -#include <assert.h> -#include <stdio.h> -#include <stdlib.h> -#include <GL/glew.h> -#include <GL/glut.h> - - -static int Width = 100, Height = 100; -static int Win; -static float Step = 0.125; -#if 0 -/* This tiny offset fixes errors in Mesa/Xlib */ -static float Xtrans = 0.5 * 0.125; -static float Ytrans = 0.5 * 0.125; -#else -static float Xtrans = 0.0; -static float Ytrans = 0.0; -#endif - - -static void -PointCalibrate(int xpos, int ypos) -{ - GLfloat rgba[4]; - float x, y; - float xmin, ymin, xmax, ymax; - - xmin = ymin = 1000.0; - xmax = ymax = -1000.0; - - for (y = -1.0; y <= 1.0; y += Step) { - for (x = -1.0; x <= 1.0; x += Step) { - glClear(GL_COLOR_BUFFER_BIT); - glBegin(GL_POINTS); - glVertex2f(xpos + x, ypos + y); - glEnd(); - glReadPixels(xpos, ypos, 1, 1, GL_RGBA, GL_FLOAT, rgba); - if (rgba[0] == 1.0 && rgba[1] == 1.0 && rgba[2] == 1.0) { - /* hit */ - if (x < xmin) - xmin = x; - if (y < ymin) - ymin = y; - if (x > xmax) - xmax = x; - if (y > ymax) - ymax = y; - } - } - } - - printf("Point at (%2d, %2d) drawn for x in [%6.3f, %6.3f] and y in [%6.3f, %6.3f]\n", - xpos, ypos, - xpos + xmin, xpos + xmax, - ypos + ymin, ypos + ymax); - - if (xmax - xmin != 1.0 - Step) { - printf(" => Inconsistant X-axis rasterization!\n"); - } - if (ymax - ymin != 1.0 - Step) { - printf(" => Inconsistant Y-axis rasterization!\n"); - } - if (xmin < 0.0) { - printf(" => Points should be X biased by about %f\n", xmin); - } - if (ymin < 0.0) { - printf(" => Points should be Y biased by about %f\n", ymin); - } - if (xmax > 1.0) { - printf(" => Points should be X biased by about %f\n", 1.0 - xmax); - } - if (ymax > 1.0) { - printf(" => Points should be Y biased by about %f\n", 1.0 - ymax); - } - -} - - -/** - * XXX Implement VLineCalibrate() someday - */ -static void -HLineCalibrate(int xpos, int ypos, int len) -{ - GLfloat rgba[2][4]; - float x, y; - float ymin, ymax; - float xmin_left, xmax_left, xmin_right, xmax_right; - - xmin_left = xmin_right = 1000.0; - xmax_left = xmax_right = -1000.0; - ymin = 1000; - ymax = -1000.0; - - /* - * First, check vertical positioning of the horizontal line - */ - for (y = -1.0; y <= 1.0; y += Step) { - glClear(GL_COLOR_BUFFER_BIT); - glBegin(GL_LINES); - glVertex2f(xpos, ypos + y); - glVertex2f(xpos + len, ypos + y); - glEnd(); - - glReadPixels(xpos + len / 2, ypos, 1, 1, GL_RGBA, GL_FLOAT, rgba); - if (rgba[0][0] == 1.0) { - /* hit */ - if (y < ymin) - ymin = y; - if (y > ymax) - ymax = y; - } - } - - printf("H-line at Y=%2d drawn for y in [%6.3f, %6.3f]\n", - ypos, - ypos + ymin, ypos + ymax); - - if (ymax - ymin != 1.0 - Step) { - printf(" => Inconsistant Y-axis rasterization!\n"); - } - - if (ymin > 0.5 ) { - printf(" => Lines should be Y biased by about %f\n", ymin - 0.5); - } - - if (ymax < 0.5 ) { - printf(" => Lines should be Y biased by about %f\n", 0.5 - ymax); - } - - /* - * Second, check endpoints (for Y at 1/2 pixel) - */ - for (x = -1.0; x <= 1.0; x += Step) { - glClear(GL_COLOR_BUFFER_BIT); - glBegin(GL_LINES); - glVertex2f(xpos + x, ypos + 0.5f); - glVertex2f(xpos + x + len, ypos + 0.5f); - glEnd(); - - /* left end */ - glReadPixels(xpos - 1, ypos, 2, 1, GL_RGBA, GL_FLOAT, rgba); - if (rgba[0][0] == 0.0 && rgba[1][0] == 1.0) { - /* hit */ - if (x < xmin_left) - xmin_left = x; - if (x > xmax_left) - xmax_left = x; - } - - /* right end */ - glReadPixels(xpos + len - 1, ypos, 2, 1, GL_RGBA, GL_FLOAT, rgba); - if (rgba[0][0] == 1.0 && rgba[1][0] == 0.0) { - /* hit */ - if (x < xmin_right) - xmin_right = x; - if (x > xmax_right) - xmax_right = x; - } - } - - printf("H-line [%d..%d) hit left end for x in [%6.3f, %6.3f] " - "hit right end for x in [%6.3f, %6.3f]\n", - xpos, xpos + len, - xpos + xmin_left, xpos + xmax_left, - xpos + len + xmin_right, xpos + len + xmax_right); - - if (xmax_left - xmin_left > 1.0 - Step) { - printf(" => Inconsistant left-end rasterization!\n"); - } - if (xmax_right - xmin_right > 1.0 - Step) { - printf(" => Inconsistant right-end rasterization!\n"); - } - - if (xmin_left != xmin_right || - xmax_left != xmax_right) { - printf(" => Inconsistant length!\n"); - } - - if (xmin_left < 0.0) { - printf(" => Coords should be X biased by about %f\n", xmin_left ); - } - if (xmin_right < 0.0) { - printf(" => Coords should be X biased by about %f\n", xmin_right ); - } - if (xmax_left >= 1.0) { - printf(" => Coords should be X biased by about %f\n", -xmax_right + 1.0); - } - if (xmax_right >= 1.0) { - printf(" => Coords should be X biased by about %f\n", -xmax_right + 1.0); - } - -} - - -static void -QuadCalibrate(int xpos, int ypos, int width, int height) -{ - GLfloat rgba1[2][4]; - GLfloat rgba2[2][4]; - float x, y; - float xmin, ymin, xmax, ymax; - - xmin = ymin = 1000.0; - xmax = ymax = -1000.0; - - for (y = -1.0; y <= 1.0; y += Step) { - for (x = -1.0; x <= 1.0; x += Step) { - glClear(GL_COLOR_BUFFER_BIT); - glBegin(GL_QUADS); - glVertex2f(xpos + x, ypos + y); - glVertex2f(xpos + x + width, ypos + y); - glVertex2f(xpos + x + width, ypos + y + height); - glVertex2f(xpos + x, ypos + y + height); - glEnd(); - - /* horizontal measurement */ - glReadPixels(xpos - 1, ypos + 2, 2, 1, GL_RGBA, GL_FLOAT, rgba1); - glReadPixels(xpos + width - 1, ypos + 2, 2, 1, GL_RGBA, GL_FLOAT, rgba2); - if (rgba1[0][0] == 0.0 && rgba1[1][0] == 1.0 && - rgba2[0][0] == 1.0 && rgba2[1][0] == 0.0) { - if (x < xmin) - xmin = x; - if (x > xmax) - xmax = x; - } - - /* vertical measurement */ - glReadPixels(xpos + 2, ypos - 1, 1, 2, GL_RGBA, GL_FLOAT, rgba1); - glReadPixels(xpos + 2, ypos + height - 1, 1, 2, GL_RGBA, GL_FLOAT, rgba2); - if (rgba1[0][0] == 0.0 && rgba1[1][0] == 1.0 && - rgba2[0][0] == 1.0 && rgba2[1][0] == 0.0) { - if (y < ymin) - ymin = y; - if (y > ymax) - ymax = y; - } - } - } - - printf("Quad at (%2d, %2d)..(%2d, %2d) drawn" - " for x in [%6.3f, %6.3f] and y in [%6.3f, %6.3f]\n", - xpos, ypos, - xpos + width, ypos + height, - xpos + xmin, xpos + xmax, - ypos + ymin, ypos + ymax); - - if (xmax - xmin != 1.0 - Step) { - printf(" => Inconsistant X-axis rasterization/size!\n"); - } - if (ymax - ymin != 1.0 - Step) { - printf(" => Inconsistant Y-axis rasterization/size!\n"); - } - - if (xmin < -0.5) { - printf(" => Coords should be X biased by about %f\n", 0.5 + xmin ); - } - if (ymin < -0.5) { - printf(" => Coords should be Y biased by about %f\n", 0.5 + ymin); - } - if (xmax > 0.5) { - printf(" => Coords should be X biased by about %f\n", -xmax + 0.5); - } - if (ymax > 0.5) { - printf(" => Coords should be Y biased by about %f\n", -ymax + 0.5); - } -} - - -/** - * Misc/disabled code for debugging. - */ -static void -DebugTest(void) -{ - glClear(GL_COLOR_BUFFER_BIT); - glEnable(GL_BLEND); - glBlendFunc(GL_ONE, GL_ONE); - - glColor3f(.5, .5, .5); - - glBegin(GL_LINES); - glVertex2f(30, 35.5); - glVertex2f(54, 35.5); - glVertex2f(54, 35.5); - glVertex2f(66, 35.5); - glEnd(); - - glDisable(GL_BLEND); - glColor3f(1,1,1); -} - - -static void -Draw(void) -{ - glClear(GL_COLOR_BUFFER_BIT); - - glPushMatrix(); - glTranslatef(Xtrans, Ytrans, 0); - - PointCalibrate(1, 1); - PointCalibrate(50, 50); - PointCalibrate(28, 17); - PointCalibrate(17, 18); - printf("\n"); - - HLineCalibrate(5, 10, 10); - HLineCalibrate(25, 22, 12); - HLineCalibrate(54, 33, 12); - HLineCalibrate(54+12, 33, 12); - printf("\n"); - - QuadCalibrate(2, 2, 10, 10); - QuadCalibrate(50, 50, 10, 10); - QuadCalibrate(28, 17, 12, 12); - QuadCalibrate(17, 28, 12, 12); - - (void) DebugTest; - - glPopMatrix(); - - glutSwapBuffers(); -} - - -static void -Reshape(int width, int height) -{ - Width = width; - Height = height; - glViewport(0, 0, width, height); - glMatrixMode(GL_PROJECTION); - glLoadIdentity(); - glOrtho(0, width, 0, height, -1, 1); - glMatrixMode(GL_MODELVIEW); - glLoadIdentity(); -} - - -static void -Key(unsigned char key, int x, int y) -{ - (void) x; - (void) y; - switch (key) { - case 27: - glutDestroyWindow(Win); - exit(0); - break; - } - glutPostRedisplay(); -} - - -static void -Init(void) -{ - printf("Measurement/callibration for basic prim rasterization...\n"); - printf("GL_RENDERER: %s\n", (char*) glGetString(GL_RENDERER)); -} - - -int -main(int argc, char *argv[]) -{ - glutInit(&argc, argv); - glutInitWindowPosition(0, 0); - glutInitWindowSize(Width, Height); - glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); - Win = glutCreateWindow(argv[0]); - glewInit(); - glutReshapeFunc(Reshape); - glutKeyboardFunc(Key); - glutDisplayFunc(Draw); - Init(); - glutMainLoop(); - return 0; -} |