arb_shader_image_load_store: Import test for mipmap level binding.

Test that image loads and stores land in the correct mipmap level of
the texture when a level other than the first is bound to an image
unit.

3 files changed, 197 insertions, 0 deletions

diff --git a/tests/all.py b/tests/all.py
index 85f58e9d7..1cc226151 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -4440,6 +4440,7 @@ arb_shader_image_load_store['host-mem-barrier'] = PiglitGLTest(['arb_shader_imag
 arb_shader_image_load_store['indexing'] = PiglitGLTest(['arb_shader_image_load_store-indexing'], run_concurrent=True)
 arb_shader_image_load_store['invalid'] = PiglitGLTest(['arb_shader_image_load_store-invalid'], run_concurrent=True)
 arb_shader_image_load_store['layer'] = PiglitGLTest(['arb_shader_image_load_store-layer'], run_concurrent=True)
+arb_shader_image_load_store['level'] = PiglitGLTest(['arb_shader_image_load_store-level'], run_concurrent=True)
 
 profile.tests['hiz'] = hiz
 profile.tests['fast_color_clear'] = fast_color_clear
diff --git a/tests/spec/arb_shader_image_load_store/CMakeLists.gl.txt b/tests/spec/arb_shader_image_load_store/CMakeLists.gl.txt
index 2dfdccff8..990c3e03a 100644
--- a/tests/spec/arb_shader_image_load_store/CMakeLists.gl.txt
+++ b/tests/spec/arb_shader_image_load_store/CMakeLists.gl.txt
@@ -21,5 +21,6 @@ piglit_add_executable(arb_shader_image_load_store-host-mem-barrier host-mem-barr
 piglit_add_executable(arb_shader_image_load_store-indexing indexing.c ${depends})
 piglit_add_executable(arb_shader_image_load_store-invalid invalid.c ${depends})
 piglit_add_executable(arb_shader_image_load_store-layer layer.c ${depends})
+piglit_add_executable(arb_shader_image_load_store-level level.c ${depends})
 
 # vim: ft=cmake:
diff --git a/tests/spec/arb_shader_image_load_store/level.c b/tests/spec/arb_shader_image_load_store/level.c
new file mode 100644
index 000000000..5fbdbaf5c
--- /dev/null
+++ b/tests/spec/arb_shader_image_load_store/level.c
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * 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.
+ */
+
+/** @file level.c
+ *
+ * Test the binding of individual mipmap levels to an image unit by
+ * dumping the whole accessible contents of an image to the
+ * framebuffer and then checking that the observed values match the
+ * bound mipmap level.  The same mipmap level is then overwritten by
+ * the shader program after its contents have been read.
+ */
+
+#include "common.h"
+
+/** Window width. */
+#define W 16
+
+/** Window height. */
+#define H 96
+
+/** Total number of pixels in the window and image. */
+#define N (W * H)
+
+/** Maximum number of mipmap levels. */
+#define M 11
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+config.supports_gl_core_version = 32;
+
+config.window_width = W;
+config.window_height = H;
+config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+static bool
+init_image(const struct image_info img, unsigned l)
+{
+        const unsigned num_levels = image_num_levels(img);
+        uint32_t pixels[4 * N * M];
+        unsigned i;
+
+        for (i = 0; i < 4 * N * num_levels; ++i)
+                pixels[i] = encode(img.format, i);
+
+        return upload_image_levels(img, num_levels, l, 0, pixels);
+}
+
+static bool
+check_fb(const struct grid_info grid, const struct image_info img, unsigned l)
+{
+        const unsigned offset = 4 * image_level_offset(img, l);
+        const unsigned n = 4 * product(grid.size);
+        uint32_t pixels_fb[4 * N], expect_fb[4 * N];
+        unsigned i;
+
+        if (!download_result(grid, pixels_fb))
+                return false;
+
+        for (i = 0; i < n; ++i) {
+                /*
+                 * The framebuffer contents should reflect level l of
+                 * the image which is read by the shader program.
+                 */
+                expect_fb[i] = encode(grid.format, offset + i);
+        }
+
+        if (!check_pixels_v(image_info_for_grid(grid), pixels_fb, expect_fb)) {
+                printf("  Source: framebuffer\n");
+                return false;
+        }
+
+        return true;
+}
+
+static bool
+check_img(const struct image_info img, unsigned l)
+{
+        const unsigned num_levels = image_num_levels(img);
+        uint32_t pixels_img[4 * N * M], expect_img[4 * N];
+        unsigned i, j;
+
+        if (!download_image_levels(img, num_levels, 0, pixels_img))
+                return false;
+
+        for (j = 0; j < num_levels; ++j) {
+                const struct image_info level_img = image_info_for_level(img, j);
+                const unsigned offset = 4 * image_level_offset(img, j);
+                const unsigned n = 4 * product(level_img.size);
+
+                for (i = 0; i < n; ++i) {
+                        if (j == l) {
+                                /*
+                                 * Level l should have been modified
+                                 * by the shader.
+                                 */
+                                expect_img[i] = encode(img.format, 33);
+                        } else {
+                                /*
+                                 * Other levels should have remained
+                                 * unchanged.
+                                 */
+                                expect_img[i] = encode(img.format, offset + i);
+                        }
+                }
+
+                if (!check_pixels_v(level_img, &pixels_img[offset],
+                                    expect_img)) {
+                        printf("  Source: image level %d\n", j);
+                        return false;
+                }
+        }
+
+        return true;
+}
+
+/**
+ * Bind an individual level of a texture mipmap to an image unit, read
+ * its contents and write back a different value to the same location.
+ */
+static bool
+run_test(const struct image_target_info *target)
+{
+        const unsigned level = 3;
+        const struct image_info img = image_info(
+                target->target, GL_RGBA32F, W, H);
+        const struct image_info level_img = image_info_for_level(img, level);
+        const struct grid_info grid = {
+                GL_FRAGMENT_SHADER_BIT, img.format,
+                image_optimal_extent(level_img.size)
+        };
+        GLuint prog = generate_program(
+                grid, GL_FRAGMENT_SHADER,
+                concat(image_hunk(level_img, ""),
+                       hunk("uniform IMAGE_T img;\n"
+                            "\n"
+                            "GRID_T op(ivec2 idx, GRID_T x) {\n"
+                            "        GRID_T v = imageLoad(img, IMAGE_ADDR(idx));\n"
+                            "        imageStore(img, IMAGE_ADDR(idx), DATA_T(33));\n"
+                            "        return v;\n"
+                            "}\n"), NULL));
+        bool ret = prog && init_fb(grid) &&
+                init_image(img, level) &&
+                set_uniform_int(prog, "img", 0) &&
+                draw_grid(grid, prog) &&
+                check_fb(grid, img, level) &&
+                check_img(img, level);
+
+        glDeleteProgram(prog);
+        return ret;
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+        enum piglit_result status = PIGLIT_PASS;
+        const struct image_target_info *target;
+
+        piglit_require_extension("GL_ARB_shader_image_load_store");
+
+        for (target = image_targets(); target->name; ++target) {
+                if (image_target_mipmapping_dimensions(target))
+                        subtest(&status, true, run_test(target),
+                                "%s level binding test", target->name);
+        }
+
+        piglit_report_result(status);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+        return PIGLIT_FAIL;
+}