/* * Copyright (c) 2011 VMware, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * on the rights to use, copy, modify, merge, publish, distribute, sub * license, and/or sell copies of the Software, and to permit persons to whom * the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NON-INFRINGEMENT. IN NO EVENT SHALL VMWARE AND/OR THEIR SUPPLIERS * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ /** * Tests glPolygonMode wrt facing. * Roland Scheidegger * December 2015 */ #include "piglit-util-gl.h" PIGLIT_GL_TEST_CONFIG_BEGIN config.supports_gl_compat_version = 20; config.window_width = 400; config.window_height = 100; config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE; config.khr_no_error_support = PIGLIT_NO_ERRORS; PIGLIT_GL_TEST_CONFIG_END static const char *TestName = "polygon-mode-facing"; static const char *vstext = "#version 130\n" "\n" "void main()\n" "{\n" " gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\n" "}\n"; static const char *fstext = "#version 130\n" "\n" "void main()\n" "{\n" " vec4 color = gl_FrontFacing ? vec4(1.0, 0.0, 0.0, 1.0)\n" " : vec4(0.0, 1.0, 0.0, 1.0);\n" " gl_FragColor = color;\n" "}\n"; static const GLfloat Colors[2][4] = { /* back color */ {0, 1, 0, 1}, /* front color */ {1, 0, 0, 1}, }; static const GLfloat Positions[4][4][2] = { {{10, 10}, {90, 10}, {90, 90}, {10, 90}}, {{190, 10}, {110, 10}, {110, 90}, {190, 90}}, {{290, 10}, {210, 10}, {210, 90}, {290, 90}}, {{310, 10}, {390, 10}, {390, 90}, {310, 90}}, }; static GLenum get_prim_mode(GLenum mode) { switch (mode) { case GL_POINT: return GL_POINTS; case GL_LINE: return GL_LINE_LOOP; case GL_FILL: return GL_QUADS; default: return 0; } } /** * Probe a 3x3 pixel region to see if any of the pixels matches the * expected color. */ static GLboolean probe_region(float px, float py, const GLfloat expectedColor[4]) { GLfloat img[3][3][4]; int i, j; glReadPixels(px-1, py-1, 3, 3, GL_RGBA, GL_FLOAT, img); /* see if any of the pixels matches the expected color */ for (i = 0; i < 3; i++) { for (j = 0; j < 3; j++) { if (img[i][j][0] == expectedColor[0] && img[i][j][1] == expectedColor[1] && img[i][j][2] == expectedColor[2]) { return GL_TRUE; } } } return GL_FALSE; } /** * Examine the pixels drawn by a rect using the four vertex positions * and determine if it was drawn filled, outlined, or as four points. * \return GL_FILL, GL_LINE, GL_POINT or GL_NONE */ static GLenum identify_primitive(const GLfloat positions[4][2], const GLfloat expectedColor[4]) { /* center */ float cx = (positions[0][0] + positions[2][0]) / 2.0; float cy = (positions[0][1] + positions[2][1]) / 2.0; /* left edge */ float lx = MIN2(positions[0][0], positions[2][0]); float ly = cy; /* right edge */ float rx = MAX2(positions[0][0], positions[2][0]); float ry = cy; /* bottom edge */ float bx = cx; float by = positions[0][1]; /* top edge */ float tx = cx; float ty = positions[1][1]; /* probe center */ if (probe_region(cx, cy, expectedColor)) return GL_FILL; /* probe left edge */ if (probe_region(lx, ly, expectedColor)) { /* and bottom edge */ if (probe_region(bx, by, expectedColor)) { /* and right edge */ if (probe_region(rx, ry, expectedColor)) { /* and top edge */ if (probe_region(tx, ty, expectedColor)) { return GL_LINE; } } } } /* probe lower-left corner */ if (probe_region(lx, by, expectedColor)) { /* probe lower-right corner */ if (probe_region(rx, by, expectedColor)) { /* probe top-left corner */ if (probe_region(lx, ty, expectedColor)) { /* probe top-right corner */ if (probe_region(rx, ty, expectedColor)) { return GL_POINT; } } } } return GL_NONE; } static GLboolean test_combo(GLenum frontMode, GLenum backMode) { GLenum frontPrim = get_prim_mode(frontMode); GLenum backPrim = get_prim_mode(backMode); GLboolean pass = GL_TRUE; GLenum expectedPrims[4]; int i; int expectFrontColorRef[4] = {1,1,1,1}; glClear(GL_COLOR_BUFFER_BIT); /* * Drawing 4 quads. The first and 3rd should always be red (front facing). * The 2nd and 4th are green with FILL backMode (lines/points are always * front facing). */ if (backMode == GL_FILL) { expectFrontColorRef[1] = expectFrontColorRef[3] = 0; } /* Draw reference image */ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); glFrontFace(GL_CCW); glDrawArrays(frontPrim, 0, 4); glDrawArrays(backPrim, 4, 4); glFrontFace(GL_CW); glDrawArrays(frontPrim, 8, 4); glDrawArrays(backPrim, 12, 4); /* determine what kind of primitives were drawn */ for (i = 0; i < 4; i++) { bool err = false; expectedPrims[i] = identify_primitive(Positions[i], Colors[expectFrontColorRef[i]]); if (i & 1) { if (expectedPrims[i] != backMode) { err = true; } } else { if (expectedPrims[i] != frontMode) { err = true; } } if (err) { /* we didn't get the expected reference primitive */ fprintf(stderr, "%s: reference drawing failed for frontPrim=%s, backPrim=%s\n", TestName, piglit_get_gl_enum_name(frontMode), piglit_get_gl_enum_name(backMode)); return GL_FALSE; } } /* Draw test image */ glClear(GL_COLOR_BUFFER_BIT); glPolygonMode(GL_FRONT, frontMode); glPolygonMode(GL_BACK, backMode); glFrontFace(GL_CCW); glDrawArrays(GL_QUADS, 0, 8); glFrontFace(GL_CW); glDrawArrays(GL_QUADS, 8, 8); /* check that these prims match expectations */ /* * The first and 3rd should always be red (front-facing), the 2nd and 4th * green (back-facing). */ for (i = 0; i < 4; i++) { GLenum prim = identify_primitive(Positions[i], Colors[!(i % 2)]); if (prim != expectedPrims[i]) { fprintf(stderr, "%s: glPolygonMode(front=%s, back=%s) failed\n", TestName, piglit_get_gl_enum_name(frontMode), piglit_get_gl_enum_name(backMode)); pass = GL_FALSE; } } piglit_present_results(); return pass; } static GLboolean test_polygonmode(void) { GLenum pass = GL_TRUE; glVertexPointer(2, GL_FLOAT, 0, Positions); glEnableClientState(GL_VERTEX_ARRAY); /* * First test with same front/back mode. * Those are probably more important to get right... */ if (!test_combo(GL_FILL, GL_FILL)) pass = GL_FALSE; if (!test_combo(GL_POINT, GL_POINT)) pass = GL_FALSE; /* * Be extra mean to mesa draw stage interactions turning lines back * to tris... */ glEnable(GL_LINE_SMOOTH); if (!test_combo(GL_LINE, GL_LINE)) pass = GL_FALSE; glDisable(GL_LINE_SMOOTH); if (!test_combo(GL_FILL, GL_POINT)) pass = GL_FALSE; if (!test_combo(GL_POINT, GL_LINE)) pass = GL_FALSE; if (!test_combo(GL_POINT, GL_FILL)) pass = GL_FALSE; if (!test_combo(GL_LINE, GL_FILL)) pass = GL_FALSE; if (!test_combo(GL_LINE, GL_POINT)) pass = GL_FALSE; /* * Be really mean to mesa draw stage interactions turning lines back * to tris... */ glEnable(GL_LINE_SMOOTH); if (!test_combo(GL_FILL, GL_LINE)) pass = GL_FALSE; if (!test_combo(GL_POINT, GL_LINE)) pass = GL_FALSE; if (!test_combo(GL_LINE, GL_FILL)) pass = GL_FALSE; if (!test_combo(GL_LINE, GL_POINT)) pass = GL_FALSE; return pass; } enum piglit_result piglit_display(void) { if (!test_polygonmode()) return PIGLIT_FAIL; return PIGLIT_PASS; } void piglit_init(int argc, char **argv) { GLuint prog; piglit_require_GLSL_version(130); piglit_ortho_projection(piglit_width, piglit_height, false); prog = piglit_build_simple_program(vstext, fstext); glUseProgram(prog); }