From 2a626860b74345335f33c055db357e35c5d4ea14 Mon Sep 17 00:00:00 2001
From: Pierre-Eric Pelloux-Prayer <pelloux@gmail.com>
Date: Wed, 10 Aug 2011 20:36:36 +0200
Subject: Add GL_SELECT render mode tests

---
 tests/all.tests                 |   5 +
 tests/general/CMakeLists.gl.txt |   1 +
 tests/general/select.c          | 260 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 266 insertions(+)
 create mode 100644 tests/general/select.c

diff --git a/tests/all.tests b/tests/all.tests
index de64e7ec..b7560ed0 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -257,6 +257,11 @@ add_plain_test(general, 'scissor-depth-clear')
 add_plain_test(general, 'scissor-many')
 add_plain_test(general, 'scissor-offscreen')
 add_plain_test(general, 'scissor-stencil-clear')
+general['GL_SELECT - no test function'] = PlainExecTest(['select', 'general'])
+general['GL_SELECT - depth-test enabled'] = PlainExecTest(['select', 'depth'])
+general['GL_SELECT - stencil-test enabled'] = PlainExecTest(['select', 'stencil'])
+general['GL_SELECT - alpha-test enabled'] = PlainExecTest(['select', 'alpha'])
+general['GL_SELECT - scissor-test enabled'] = PlainExecTest(['select', 'scissor'])
 add_plain_test(general, 'stencil-drawpixels')
 add_plain_test(general, 'stencil-twoside')
 add_plain_test(general, 'stencil-wrap')
diff --git a/tests/general/CMakeLists.gl.txt b/tests/general/CMakeLists.gl.txt
index c6275bee..d6e73cf1 100644
--- a/tests/general/CMakeLists.gl.txt
+++ b/tests/general/CMakeLists.gl.txt
@@ -87,6 +87,7 @@ add_executable (scissor-depth-clear scissor-depth-clear.c)
 add_executable (scissor-many scissor-many.c)
 add_executable (scissor-offscreen scissor-offscreen.c)
 add_executable (scissor-stencil-clear scissor-stencil-clear.c)
+add_executable (select select.c)
 add_executable (stencil-drawpixels stencil-drawpixels.c)
 add_executable (stencil-twoside stencil-twoside.c)
 add_executable (stencil-wrap stencil-wrap.c)
diff --git a/tests/general/select.c b/tests/general/select.c
new file mode 100644
index 00000000..fa60e39d
--- /dev/null
+++ b/tests/general/select.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright © 2011
+ *
+ * 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
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ *
+ * Authors:
+ *	 Pierre-Eric Pelloux-Prayer <pelloux@gmail.com>
+ *
+ * Description:
+ *  This test represents a simple usage of GL_SELECT rendering mode.
+ *  It draws several squares to screen, with various GL_..._TEST active,
+ *  and then verifies the number of hits and the content of the select buffer.
+ *  Based on this documentation: http://glprogramming.com/red/chapter13.html
+ *
+ */
+
+#include "piglit-util.h"
+#include "piglit-framework.h"
+
+int piglit_width = 100;
+int piglit_height = 100;
+int piglit_window_mode = GLUT_RGB | GLUT_ALPHA | GLUT_DEPTH | GLUT_STENCIL;
+
+GLuint ReferenceHitEntries[3][64];
+#define NAME_STACK_DEPTH	0
+#define MIN_Z			1
+#define MAX_Z			2
+#define NAME_STACK_0		3
+
+/**
+ * Draw 4 objects and handle name stack
+ */
+static void
+draw_objects()
+{
+	float zscale = (float)(~0u);
+	glInitNames();
+
+	/* no draw call issued for name '0' */
+	glPushName(0);
+
+	/* OBJECT 1 */
+	glPushName(1);
+	/* draw object */
+	glColor3f(1.0, 0.0, 0.0);
+	piglit_draw_rect_z(0.8, 10, 30, 50, 50);
+	/* fill reference buffer */
+	ReferenceHitEntries[0][NAME_STACK_DEPTH] = 2;
+	ReferenceHitEntries[0][MIN_Z] = (GLuint)roundf(zscale * ((1 - 0.8) * 0.5));
+	ReferenceHitEntries[0][MAX_Z] = ReferenceHitEntries[0][MIN_Z];
+	ReferenceHitEntries[0][NAME_STACK_0] = 0;
+	ReferenceHitEntries[0][NAME_STACK_0 + 1] = 1;
+
+	/* OBJECT 2 */
+	/* 2 draw calls for name '2' */
+	glPushName(2);
+	glColor3f(0.0, 1.0, 0.0);
+	piglit_draw_rect_z(0.5, 40, 5, 25, 30);
+	piglit_draw_rect_z(0.4, 10, 75, 25, 10);
+	/* fill reference buffer */
+	ReferenceHitEntries[1][NAME_STACK_DEPTH] = 3;
+	ReferenceHitEntries[1][MIN_Z] = (GLuint)roundf(zscale * ((1 - 0.5)*0.5));
+	ReferenceHitEntries[1][MAX_Z] = (GLuint)roundf(zscale * ((1 - 0.4)*0.5));
+	ReferenceHitEntries[1][NAME_STACK_0] = 0;
+	ReferenceHitEntries[1][NAME_STACK_0 + 1] = 1;
+	ReferenceHitEntries[1][NAME_STACK_0 + 2] = 2;
+
+	/* OBJECT 3 */
+	glPopName();
+	glPushName(3);
+	/* drawn offscreen */
+	piglit_draw_rect_z(0.3, 250, 45, 280, 20);
+
+	/* OBJECT 4 */
+	/* glLoadName instead of glPushName */
+	glLoadName(4);
+	glColor3f(0.0, 0.0, 1.0);
+	piglit_draw_rect_z(0.2, 50, 45, 80, 20);
+	/* fill reference buffer */
+	ReferenceHitEntries[2][NAME_STACK_DEPTH] = 3;
+	ReferenceHitEntries[2][MIN_Z] = (GLuint)roundf(zscale * ((1 - 0.2)*0.5));
+	ReferenceHitEntries[2][MAX_Z] = ReferenceHitEntries[2][MIN_Z];
+	ReferenceHitEntries[2][NAME_STACK_0] = 0;
+	ReferenceHitEntries[2][NAME_STACK_0 + 1] = 1;
+	ReferenceHitEntries[2][NAME_STACK_0 + 2] = 4;
+}
+
+/**
+ * Helper function to compare 2 hit records
+ */
+static bool
+compare_hit_record(GLuint* hit1, GLuint* hit2)
+{
+	int i;
+	float zscale = (float)(~0u);
+	float diffz;
+
+	if (hit1[NAME_STACK_DEPTH] != hit2[NAME_STACK_DEPTH]) {
+		printf("\t%s : Incorrect name stack depth : %u %u\n",
+			__FUNCTION__,
+			hit1[NAME_STACK_DEPTH],
+			hit2[NAME_STACK_DEPTH]);
+		return false;
+	}
+
+	diffz = abs(hit1[MIN_Z] - hit2[MIN_Z])/zscale;
+	if (diffz > 0.1) {
+		printf("\t%s : Incorrect Minz : %u %u (%f %f) %f\n",
+			__FUNCTION__,
+			hit1[MIN_Z],
+			hit2[MIN_Z],
+			hit1[MIN_Z] / zscale,
+			hit2[MIN_Z] / zscale,
+			diffz);
+		return false;
+	}
+
+	diffz = abs(hit1[MAX_Z] - hit2[MAX_Z])/zscale;
+	if (diffz > 0.1) {
+		printf("\t%s : Incorrect Maxz : %u %u (%f %f) %f\n",
+			__FUNCTION__,
+			hit1[MAX_Z],
+			hit2[MAX_Z],
+			hit1[MAX_Z] / zscale,
+			hit2[MAX_Z] / zscale,
+			diffz);
+		return false;
+	}
+
+	for (i=0; i<hit1[NAME_STACK_DEPTH]; i++) {
+		if (hit1[NAME_STACK_0 + i] != hit2[NAME_STACK_0 + i])
+			return false;
+	}
+	return true;
+}
+
+/**
+ * Helper function to check select buffer
+ */
+static bool
+validate_select_buffer(GLuint* buffer)
+{
+	int i,j;
+	GLint hits = glRenderMode(GL_RENDER);
+	bool object_hit_found[3] = {false, false, false};
+	GLuint* ptr;
+
+	if (hits != 3) {
+		printf("\t%s : unexpected hit count:%d\n", __FUNCTION__, hits);
+		return false;
+	}
+
+	ptr = buffer;
+	/* ordering in select buffer isn't necessarly the same as drawing order,
+	 *  so we need to look for each hit entry
+	 */
+	for (i=0; i<hits; i++) {
+		for (j=0; j<3; j++) {
+			if (!object_hit_found[j]) {
+				if (compare_hit_record(ptr, ReferenceHitEntries[j])) {
+					object_hit_found[j] = true;
+					break;
+				}
+			}
+		}
+		if (j == 3)
+			return false;
+
+		/* advance pointer */
+		ptr += 3 + ptr[NAME_STACK_DEPTH];
+	}
+
+	return true;
+}
+
+void
+test_case_setup(bool depth, bool stencil, bool alpha, bool scissor) {
+	if (depth)
+		glEnable(GL_DEPTH_TEST);
+	else
+		glDisable(GL_DEPTH_TEST);
+
+	if (stencil)
+		glEnable(GL_STENCIL_TEST);
+	else
+		glDisable(GL_STENCIL_TEST);
+
+	if (alpha)
+		glEnable(GL_ALPHA_TEST);
+	else
+		glDisable(GL_ALPHA_TEST);
+
+	if (scissor)
+		glEnable(GL_SCISSOR_TEST);
+	else
+		glDisable(GL_SCISSOR_TEST);
+
+	/* setup all test functions to never pass */
+	glDepthFunc(GL_NEVER);
+	glStencilFunc(GL_NEVER, 0, 0);
+	glAlphaFunc(GL_NEVER, 0);
+	glScissor(0, 0, 0, 0);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	return PIGLIT_FAIL;
+}
+
+enum piglit_result
+do_blit_test(void)
+{
+	GLuint buff[64] = {0};
+	glSelectBuffer(64, buff);
+
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+	glClearColor(0.5, 0.5, 0.5, 0.0);
+
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	glRenderMode(GL_SELECT);
+	draw_objects();
+
+	return validate_select_buffer(buff) ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void piglit_init(int argc, char**argv)
+{
+	enum piglit_result pass;
+
+	if (argc < 2) {
+		test_case_setup(false, false, false, false);
+		pass = do_blit_test();
+	} else {
+		test_case_setup(
+			strcmp(argv[1], "depth") == 0,
+			strcmp(argv[1], "stencil") == 0,
+			strcmp(argv[1], "alpha") == 0,
+			strcmp(argv[1], "scissor") == 0);
+		pass = do_blit_test();
+	}
+	piglit_report_result(pass);
+}
-- 
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