New test: texturing/texredefine

Test some texture redefinition scenarios: Switching between different
texture sizes & mipmapping enable/disable

1 files changed, 255 insertions, 0 deletions

diff --git a/tests/texturing/texredefine.c b/tests/texturing/texredefine.c
new file mode 100644
index 00000000..7d2334a7
--- /dev/null
+++ b/tests/texturing/texredefine.c
@@ -0,0 +1,255 @@
+/*
+ * Copyright (c) The Piglit project 2008
+ *
+ * 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
+ * VA LINUX SYSTEM, IBM 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.
+ */
+
+/**
+ * @file
+ * Test whether resizing a texture and switching from/to mipmapping
+ * works correctly.
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+#include "piglit-util.h"
+
+static int Width = 128, Height = 128;
+static int Automatic = 0;
+static int CurrentTest = 0;
+
+static const int CellSize = 8; /* see cell_coords */
+
+static int testnr;
+
+static void make_color(int nr, float* result)
+{
+	int i;
+
+	for(i = 0; i < 4; ++i) {
+		result[i] = ((nr & 3) + 1) * 0.2;
+		nr >>= 2;
+	}
+}
+
+static void cell_coords(int cellnr, int *px, int *py)
+{
+	*px = CellSize * (cellnr & 15); /* Hard-coded things! */
+	*py = CellSize * (cellnr / 16);
+	assert(cellnr < 256);
+}
+
+/** Load a texture image with a constant color generated by \ref make_color */
+static void teximage2d(GLuint lvl, GLuint w, GLuint h, int colornum)
+{
+	float color[4];
+	float* tex;
+	int i;
+
+	make_color(colornum, color);
+	tex = (float*)malloc(w*h*4*sizeof(float));
+	for(i = 0; i < w*h; ++i) {
+		tex[4*i] = color[0];
+		tex[4*i + 1] = color[1];
+		tex[4*i + 2] = color[2];
+		tex[4*i + 3] = color[3];
+	}
+	glTexImage2D(GL_TEXTURE_2D, lvl, GL_RGBA, w, h, 0, GL_RGBA, GL_FLOAT, tex);
+	free(tex);
+}
+
+/** Render the given texture level into the given cell and verify the resulting color*/
+static int cell(int cellnr, int lvl, GLuint basew, GLuint baseh, int colornr,
+	const char* testnamefmt, ...)
+{
+	float color[4];
+	float *readback;
+	float tcx = (float)CellSize / basew * (1 << lvl);
+	float tcy = (float)CellSize / baseh * (1 << lvl);
+	int cellx, celly;
+	int x, y;
+
+	make_color(colornr, color);
+	cell_coords(cellnr, &cellx, &celly);
+
+	glBegin(GL_QUADS);
+		glTexCoord2f(0, 0);
+		glVertex2f(cellx, celly);
+		glTexCoord2f(tcx, 0);
+		glVertex2f(cellx+CellSize, celly);
+		glTexCoord2f(tcx, tcy);
+		glVertex2f(cellx+CellSize, celly+CellSize);
+		glTexCoord2f(0, tcy);
+		glVertex2f(cellx, celly+CellSize);
+	glEnd();
+
+	readback = (float*)malloc(CellSize*CellSize*4*sizeof(float));
+	glReadPixels(cellx, celly, CellSize, CellSize, GL_RGBA, GL_FLOAT, readback);
+	for(y = 0; y < CellSize; ++y) {
+		for(x = 0; x < CellSize; ++x) {
+			float *read = readback + 4*(y*CellSize + x);
+			float eps = 0.01;
+			if (fabs(read[0] - color[0]) > eps ||
+			    fabs(read[1] - color[1]) > eps ||
+			    fabs(read[2] - color[2]) > eps ||
+			    fabs(read[3] - color[3]) > eps) {
+				va_list args;
+				va_start(args, testnamefmt);
+				fprintf(stderr, "Test #%i failed: ", cellnr+1);
+				vfprintf(stderr, testnamefmt, args);
+				fprintf(stderr, "\n  First failing pixel at %ix%i of cell\n", x, y);
+				fprintf(stderr, "  Expected: %f %f %f %f\n", color[0], color[1], color[2], color[3]);
+				fprintf(stderr, "  Readback: %f %f %f %f\n", read[0], read[1], read[2], read[3]);
+				va_end(args);
+				free(readback);
+				return 0;
+			}
+		}
+	}
+	free(readback);
+	return 1;
+}
+
+/** Run a couple of tests with the given base texture size */
+static int test_size(GLuint basew, GLuint baseh)
+{
+	int lvls, lvl;
+	GLuint w = basew;
+	GLuint h = baseh;
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	teximage2d(0, w, h, testnr);
+	if (!cell(testnr, 0, basew, baseh, testnr,
+	          "Nearest filtering, base size %ix%i", basew, baseh))
+		return 0;
+	testnr++;
+
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
+	for(lvls = 0; w >= 1 || h >= 1; lvls++, w >>= 1, h >>= 1) {
+		if (!w)
+			w = 1;
+		if (!h)
+			h = 1;
+
+		teximage2d(lvls, w, h, testnr+lvls);
+	}
+
+	for(lvl = 0; lvl < lvls; ++lvl) {
+		if (!cell(testnr+lvl, lvl, basew, baseh, testnr+lvl,
+		          "Mip filtering, base size %ix%i, level %i",
+		          basew, baseh, lvl))
+			return 0;
+	}
+	testnr += lvls;
+
+	return 1;
+}
+
+struct size {
+	GLuint w, h;
+};
+
+static const struct size sizes[] = {
+	{ 16, 16 },
+	{ 32, 16 },
+	{ 16, 32 },
+	{ 32, 32 },
+	{ 16, 16 }
+};
+
+static void Redisplay(void)
+{
+	int sizeidx;
+
+	testnr = 0;
+
+	glClearColor(0.5, 0.5, 0.5, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	glEnable(GL_TEXTURE_2D);
+
+	for(sizeidx = 0; sizeidx < sizeof(sizes)/sizeof(sizes[0]); ++sizeidx) {
+		if (!test_size(sizes[sizeidx].w, sizes[sizeidx].h)) {
+			if (Automatic)
+				piglit_report_result(PIGLIT_FAILURE);
+		}
+	}
+
+	glDisable(GL_TEXTURE_2D);
+	glutSwapBuffers();
+
+	if (Automatic)
+		piglit_report_result(PIGLIT_SUCCESS);
+}
+
+
+static void Reshape(int width, int height)
+{
+	glViewport(0, 0, width, height);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
+	glMatrixMode(GL_MODELVIEW);
+	glLoadIdentity();
+}
+
+
+static void Init(void)
+{
+	Reshape(Width,Height);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+	(void) x;
+	(void) y;
+	switch (key) {
+	case 27:
+		exit(0);
+		break;
+	}
+	glutPostRedisplay();
+}
+
+int main(int argc, char *argv[])
+{
+	int i;
+	glutInit(&argc, argv);
+	if (argc == 2 && !strcmp(argv[1], "-auto"))
+		Automatic = 1;
+	glutInitWindowPosition(0, 0);
+	glutInitWindowSize(Width, Height);
+	glutInitDisplayMode(GLUT_RGB | GLUT_ALPHA);
+	glutCreateWindow(argv[0]);
+	glutReshapeFunc(Reshape);
+	glutDisplayFunc(Redisplay);
+	if (!Automatic)
+		glutKeyboardFunc(Key);
+	Init();
+	glutMainLoop();
+	return 0;
+}
+