arb_texture_cube_map_array: add fbo test

This tests the glFramebufferTextureLayer interface.
Reviewed-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

tests/spec/arb_texture_cube_map_array/CMakeLists.gl.txt

@@ -13,3 +13,4 @@ piglit_add_executable (arb_texture_cube_map_array-cubemap cubemap.c)
 piglit_add_executable (arb_texture_cube_map_array-teximage3d-invalid-values teximage3d-invalid-values.c)
 piglit_add_executable (arb_texture_cube_map_array-get get.c)
 piglit_add_executable (arb_texture_cube_map_array-sampler-cube-array-shadow sampler-cube-array-shadow.c)
+piglit_add_executable (arb_texture_cube_map_array-fbo-cubemap-array fbo-cubemap-array.c)

tests/spec/arb_texture_cube_map_array/fbo-cubemap-array.c

+/*
+ * Copyright © 2009 Intel Corporation
+ * Copyright (c) 2010 VMware, Inc.
+ * Copyright © 2012 Red Hat 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
+ * 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:
+ *     Dave Airlie
+ *
+ */
+
+/** @file fbo-cubemap-array.c
+ *
+ * Tests that drawing to each level of an cubemap array texture FBO and then
+ * drawing views * of those individual layerfaces to the window system framebuffer succeeds.
+ * based on fbo-array.c
+ */
+
+#include "piglit-util-gl-common.h"
+
+#define BUF_WIDTH 32
+#define BUF_HEIGHT 32
+
+PIGLIT_GL_TEST_MAIN(
+    200 /*window_width*/,
+    100 /*window_height*/,
+    GLUT_DOUBLE | GLUT_RGB)
+
+#define NUM_FACES       6
+#define NUM_LAYERS	3
+
+float layer_color[NUM_LAYERS * NUM_FACES][4] = {
+	{1.0, 0.0, 0.0, 0.0},
+	{0.0, 1.0, 0.0, 0.0},
+	{0.0, 0.0, 1.0, 0.0},
+	{1.0, 0.0, 1.0, 0.0},
+	{1.0, 1.0, 0.0, 0.0},
+	{0.0, 1.0, 1.0, 0.0},
+
+	{0.0, 1.0, 1.0, 0.0},
+	{1.0, 0.0, 0.0, 0.0},
+	{0.0, 1.0, 0.0, 0.0},
+	{0.0, 0.0, 1.0, 0.0},
+	{1.0, 0.0, 1.0, 0.0},
+	{1.0, 1.0, 0.0, 0.0},
+
+	{1.0, 1.0, 0.0, 0.0},
+	{0.0, 1.0, 1.0, 0.0},
+	{1.0, 0.0, 0.0, 0.0},
+	{0.0, 1.0, 0.0, 0.0},
+	{0.0, 0.0, 1.0, 0.0},
+	{1.0, 0.0, 1.0, 0.0},
+};
+
+int num_layers = NUM_LAYERS * NUM_FACES;
+
+static const char *prog = "fbo-cubemap-array";
+
+static const char *frag_shader_cube_array_text =
+   "#version 130\n"
+   "#extension GL_ARB_texture_cube_map_array : enable \n"
+   "uniform samplerCubeArray tex; \n"
+   "void main() \n"
+   "{ \n"
+   "   gl_FragColor = texture(tex, gl_TexCoord[0]); \n"
+   "} \n";
+
+static GLuint frag_shader_cube_array;
+static GLuint program_cube_array;
+
+static int
+create_array_fbo(void)
+{
+	GLuint tex, fb;
+	GLenum status;
+	int layer;
+
+	glGenTextures(1, &tex);
+	glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, tex);
+	assert(glGetError() == 0);
+
+	/* allocate empty array texture */
+	glTexImage3D(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, 0, GL_RGBA,
+		     BUF_WIDTH, BUF_HEIGHT, num_layers,
+		     0,
+		     GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	assert(glGetError() == 0);
+
+	glGenFramebuffersEXT(1, &fb);
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
+
+	/* draw something into each layer of the array texture */
+	for (layer = 0; layer < num_layers; layer++) {
+		glFramebufferTextureLayer(GL_FRAMEBUFFER_EXT,
+					     GL_COLOR_ATTACHMENT0_EXT,
+					     tex,
+					     0,
+					     layer);
+
+		assert(glGetError() == 0);
+
+		status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
+		if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+			fprintf(stderr, "FBO incomplete\n");
+			piglit_report_result(PIGLIT_SKIP);
+		}
+
+		glViewport(0, 0, BUF_WIDTH, BUF_HEIGHT);
+		piglit_ortho_projection(BUF_WIDTH, BUF_HEIGHT, GL_FALSE);
+
+		/* solid color quad */
+		glColor4fv(layer_color[layer]);
+		piglit_draw_rect(-2, -2, BUF_WIDTH + 2, BUF_HEIGHT + 2);
+	}
+
+
+done:
+	glDeleteFramebuffersEXT(1, &fb);
+	return tex;
+}
+
+GLfloat a_cube_face_texcoords[6][4][4];
+
+void setup_texcoords(void)
+{
+	int i, j;
+	for (i = 0; i < 6; i++) {
+		for (j = 0; j < 4; j++) {
+			memcpy(a_cube_face_texcoords[i][j], cube_face_texcoords[i][j], 3 * sizeof(GLfloat));
+		}
+	}
+}
+
+/* Draw a textured quad, sampling only the given layerface of the
+ * array texture.
+ */
+static void
+draw_layer(int x, int y, int layerface)
+{
+	GLint face = layerface % 6;
+	GLint layer = layerface / 6;
+	GLint loc;
+
+	glUseProgram(program_cube_array);
+	loc = glGetUniformLocation(program_cube_array, "tex");
+	glUniform1i(loc, 0); /* texture unit p */
+
+	glViewport(0, 0, piglit_width, piglit_height);
+	piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+	glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP_ARRAY_ARB, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+	glBegin(GL_QUADS);
+
+	a_cube_face_texcoords[face][0][3] = layer;
+	a_cube_face_texcoords[face][1][3] = layer;
+	a_cube_face_texcoords[face][2][3] = layer;
+	a_cube_face_texcoords[face][3][3] = layer;
+
+	glTexCoord4fv(a_cube_face_texcoords[face][0]);
+	glVertex2f(x, y);
+
+	glTexCoord4fv(a_cube_face_texcoords[face][1]);
+	glVertex2f(x + BUF_WIDTH, y);
+
+	glTexCoord4fv(a_cube_face_texcoords[face][2]);
+	glVertex2f(x + BUF_WIDTH, y + BUF_HEIGHT);
+
+	glTexCoord4fv(a_cube_face_texcoords[face][3]);
+	glVertex2f(x, y + BUF_HEIGHT);
+
+	glEnd();
+
+	glUseProgram(0);
+}
+
+static GLboolean test_layer_drawing(int start_x, int start_y, float *expected)
+{
+	return piglit_probe_rect_rgb(start_x, start_y, BUF_WIDTH, BUF_HEIGHT,
+				     expected);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+	GLboolean pass = GL_TRUE;
+	int layer;
+	GLuint tex;
+	int y;
+
+	glClearColor(1.0, 1.0, 1.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	tex = create_array_fbo();
+
+	y = -1;
+	for (layer = 0; layer < num_layers; layer++) {
+		int x = 1 + (layer % 6) * (BUF_WIDTH + 1);
+		if (layer % 6 == 0)
+			y++;
+		draw_layer(x, y * BUF_HEIGHT, layer);
+
+	}
+
+	y = -1;
+	for (layer = 0; layer < num_layers; layer++) {
+		int x = 1 + (layer % 6) * (BUF_WIDTH + 1);
+		if (layer % 6 == 0)
+			y++;
+		pass &= test_layer_drawing(x, y * BUF_HEIGHT, layer_color[layer]);
+	}
+
+	glDeleteTextures(1, &tex);
+
+	piglit_present_results();
+
+	return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
+
+void piglit_init(int argc, char **argv)
+{
+	piglit_require_extension("GL_ARB_texture_cube_map_array");
+
+	/* Make shader programs */
+	frag_shader_cube_array =
+		piglit_compile_shader_text(GL_FRAGMENT_SHADER,
+					   frag_shader_cube_array_text);
+	piglit_check_gl_error(GL_NO_ERROR);
+
+	program_cube_array = piglit_link_simple_program(0, frag_shader_cube_array);
+	piglit_check_gl_error(GL_NO_ERROR);
+
+	setup_texcoords();
+}