Define helper data structures and functions to query several kinds of
information for any supported image format, target or shader stage,
like the matching pixel transfer type and format for a given image
format, GLSL type information, error tolerance, maximum supported
dimensions and samples for a given image dimensionality, number of
supported image uniforms for a given shader stage, etc.
This also defines the image_info data structure that aggregates some
combination of image target, format and dimensions in a single object
to avoid having to repeat the same three arguments constantly when
working with images.
---
tests/spec/arb_shader_image_load_store/image.c | 759 +++++++++++++++++++++++++
tests/spec/arb_shader_image_load_store/image.h | 375 ++++++++++++
2 files changed, 1134 insertions(+)
create mode 100644 tests/spec/arb_shader_image_load_store/image.c
create mode 100644 tests/spec/arb_shader_image_load_store/image.h
diff --git a/tests/spec/arb_shader_image_load_store/image.c
b/tests/spec/arb_shader_image_load_store/image.c
new file mode 100644
index 0000000..7e8d7f9
--- /dev/null
+++ b/tests/spec/arb_shader_image_load_store/image.c
@@ -0,0 +1,759 @@
+/*
+ * 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 image.c
+ *
+ * Common image format, target and shader stage metadata.
+ */
+
+#include "image.h"
+
+struct image_extent
+image_optimal_extent(struct image_extent ext)
+{
+ const unsigned n = product(ext);
+ const unsigned w = 1 << MIN2(ffs(n) - 1, (int)log2(n) / 2);
+ const struct image_extent opt = {
+ w, n / w, 1, 1
+ };
+
+ return opt;
+}
+
+const struct image_format_info image_formats_load_store[] = {
+ { "rgba32f", GL_RGBA32F, GL_RGBA, GL_FLOAT, { 32, 32, 32, 32 } },
+ { "rgba16f", GL_RGBA16F, GL_RGBA, GL_HALF_FLOAT, { 16, 16, 16, 16 } },
+ { "rg32f", GL_RG32F, GL_RG, GL_FLOAT, { 32, 32, 0, 0 } },
+ { "rg16f", GL_RG16F, GL_RG, GL_HALF_FLOAT, { 16, 16, 0, 0 } },
+ { "r11f_g11f_b10f", GL_R11F_G11F_B10F, GL_RGB,
GL_UNSIGNED_INT_10F_11F_11F_REV, { 11, 11, 10, 0 } },
+ { "r32f", GL_R32F, GL_RED, GL_FLOAT, { 32, 0, 0, 0 } },
+ { "r16f", GL_R16F, GL_RED, GL_HALF_FLOAT, { 16, 0, 0, 0 } },
+ { "rgba32ui", GL_RGBA32UI, GL_RGBA_INTEGER, GL_UNSIGNED_INT, { 32, 32,
32, 32 } },
+ { "rgba16ui", GL_RGBA16UI, GL_RGBA_INTEGER, GL_UNSIGNED_SHORT, { 16,
16, 16, 16 } },
+ { "rgb10_a2ui", GL_RGB10_A2UI, GL_RGBA_INTEGER,
GL_UNSIGNED_INT_2_10_10_10_REV, { 10, 10, 10, 2 } },
+ { "rgba8ui", GL_RGBA8UI, GL_RGBA_INTEGER, GL_UNSIGNED_BYTE, { 8, 8, 8,
8 } },
+ { "rg32ui", GL_RG32UI, GL_RG_INTEGER, GL_UNSIGNED_INT, { 32, 32, 0, 0
} },
+ { "rg16ui", GL_RG16UI, GL_RG_INTEGER, GL_UNSIGNED_SHORT, { 16, 16, 0,
0 } },
+ { "rg8ui", GL_RG8UI, GL_RG_INTEGER, GL_UNSIGNED_BYTE, { 8, 8, 0, 0 } },
+ { "r32ui", GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, { 32, 0, 0, 0 }
},
+ { "r16ui", GL_R16UI, GL_RED_INTEGER, GL_UNSIGNED_SHORT, { 16, 0, 0, 0
} },
+ { "r8ui", GL_R8UI, GL_RED_INTEGER, GL_UNSIGNED_BYTE, { 8, 0, 0, 0 } },
+ { "rgba32i", GL_RGBA32I, GL_RGBA_INTEGER, GL_INT, { 32, 32, 32, 32 } },
+ { "rgba16i", GL_RGBA16I, GL_RGBA_INTEGER, GL_SHORT, { 16, 16, 16, 16 }
},
+ { "rgba8i", GL_RGBA8I, GL_RGBA_INTEGER, GL_BYTE, { 8, 8, 8, 8 } },
+ { "rg32i", GL_RG32I, GL_RG_INTEGER, GL_INT, { 32, 32, 0, 0 } },
+ { "rg16i", GL_RG16I, GL_RG_INTEGER, GL_SHORT, { 16, 16, 0, 0 } },
+ { "rg8i", GL_RG8I, GL_RG_INTEGER, GL_BYTE, { 8, 8, 0, 0 } },
+ { "r32i", GL_R32I, GL_RED_INTEGER, GL_INT, { 32, 0, 0, 0 } },
+ { "r16i", GL_R16I, GL_RED_INTEGER, GL_SHORT, { 16, 0, 0, 0 } },
+ { "r8i", GL_R8I, GL_RED_INTEGER, GL_BYTE, { 8, 0, 0, 0 } },
+ { "rgba16", GL_RGBA16, GL_RGBA, GL_UNSIGNED_SHORT, { 16, 16, 16, 16 }
},
+ { "rgb10_a2", GL_RGB10_A2, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, {
10, 10, 10, 2 } },
+ { "rgba8", GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE, { 8, 8, 8, 8 } },
+ { "rg16", GL_RG16, GL_RG, GL_UNSIGNED_SHORT, { 16, 16, 0, 0 } },
+ { "rg8", GL_RG8, GL_RG, GL_UNSIGNED_BYTE, { 8, 8, 0, 0 } },
+ { "r16", GL_R16, GL_RED, GL_UNSIGNED_SHORT, { 16, 0, 0, 0 } },
+ { "r8", GL_R8, GL_RED, GL_UNSIGNED_BYTE, { 8, 0, 0, 0 } },
+ { "rgba16_snorm", GL_RGBA16_SNORM, GL_RGBA, GL_SHORT, { 16, 16, 16, 16
} },
+ { "rgba8_snorm", GL_RGBA8_SNORM, GL_RGBA, GL_BYTE, { 8, 8, 8, 8 } },
+ { "rg16_snorm", GL_RG16_SNORM, GL_RG, GL_SHORT, { 16, 16, 0, 0 } },
+ { "rg8_snorm", GL_RG8_SNORM, GL_RG, GL_BYTE, { 8, 8, 0, 0 } },
+ { "r16_snorm", GL_R16_SNORM, GL_RED, GL_SHORT, { 16, 0, 0, 0 } },
+ { "r8_snorm", GL_R8_SNORM, GL_RED, GL_BYTE, { 8, 0, 0, 0 } },
+ { 0 }
+};
+
+const struct image_format_info image_formats_atomic[] = {
+ { "r32ui", GL_R32UI, GL_RED_INTEGER, GL_UNSIGNED_INT, { 32, 0, 0, 0 }
},
+ { "r32i", GL_R32I, GL_RED_INTEGER, GL_INT, { 32, 0, 0, 0 } },
+ { 0 }
+};
+
+const struct image_format_info *
+get_image_format(GLenum f)
+{
+ const struct image_format_info *format;
+
+ for (format = image_formats_load_store; format->format; ++format) {
+ if (format->format == f)
+ return format;
+ }
+
+ return NULL;
+}
+
+GLenum
+image_base_format(const struct image_format_info *format)
+{
+ switch (format->pixel_format) {
+ case GL_RGBA:
+ case GL_RGB:
+ case GL_RG:
+ case GL_RED:
+ return GL_RGBA;
+
+ case GL_RGBA_INTEGER:
+ case GL_RG_INTEGER:
+ case GL_RED_INTEGER:
+ return GL_RGBA_INTEGER;
+
+ default:
+ abort();
+ }
+}
+
+GLenum
+image_base_type(const struct image_format_info *format)
+{
+ switch (image_base_format(format)) {
+ case GL_RGBA:
+ return GL_FLOAT;
+
+ case GL_RGBA_INTEGER:
+ switch (format->pixel_type) {
+ case GL_INT:
+ case GL_SHORT:
+ case GL_BYTE:
+ return GL_INT;
+
+ case GL_UNSIGNED_INT:
+ case GL_UNSIGNED_SHORT:
+ case GL_UNSIGNED_INT_2_10_10_10_REV:
+ case GL_UNSIGNED_BYTE:
+ return GL_UNSIGNED_INT;
+
+ default:
+ abort();
+ }
+ default:
+ abort();
+ }
+}
+
+GLenum
+image_base_internal_format(const struct image_format_info *format)
+{
+ switch (image_base_type(format)) {
+ case GL_FLOAT:
+ return GL_RGBA32F;
+
+ case GL_INT:
+ return GL_RGBA32I;
+
+ case GL_UNSIGNED_INT:
+ return GL_RGBA32UI;
+
+ default:
+ abort();
+ }
+}
+
+GLenum
+image_compat_format(const struct image_format_info *format)
+{
+ const unsigned bits = (format->bits[0] + format->bits[1] +
+ format->bits[2] + format->bits[3]);
+
+ switch (bits) {
+ case 128:
+ return GL_RGBA32UI;
+
+ case 64:
+ return GL_RG32UI;
+
+ case 32:
+ return GL_R32UI;
+
+ case 16:
+ return GL_R16UI;
+
+ case 8:
+ return GL_R8UI;
+
+ default:
+ abort();
+ }
+}
+
+const char *
+image_scalar_type_name(const struct image_format_info *format)
+{
+ switch (image_base_type(format)) {
+ case GL_FLOAT:
+ return "float";
+
+ case GL_INT:
+ return "int";
+
+ case GL_UNSIGNED_INT:
+ return "uint";
+
+ default:
+ abort();
+ }
+}
+
+unsigned
+image_num_components(const struct image_format_info *format)
+{
+ return (!!format->bits[0] + !!format->bits[1] +
+ !!format->bits[2] + !!format->bits[3]);
+}
+
+const char *
+image_vector_type_name(const struct image_format_info *format)
+{
+ switch (image_base_type(format)) {
+ case GL_FLOAT:
+ return "vec4";
+
+ case GL_INT:
+ return "ivec4";
+
+ case GL_UNSIGNED_INT:
+ return "uvec4";
+
+ default:
+ abort();
+ }
+}
+
+const char *
+image_type_name(const struct image_format_info *format)
+{
+ switch (image_base_type(format)) {
+ case GL_FLOAT:
+ return "image";
+
+ case GL_INT:
+ return "iimage";
+
+ case GL_UNSIGNED_INT:
+ return "uimage";
+
+ default:
+ abort();
+ }
+}
+
+struct image_datum
+image_format_scale(const struct image_format_info *format)
+{
+ struct image_datum v = { 0.0 };
+ int i;
+
+ for (i = 0; i < 4 && format->bits[i]; ++i) {
+ switch (image_base_type(format)) {
+ case GL_FLOAT:
+ set_idx(v, i, 1.0);
+ break;
+
+ case GL_INT:
+ set_idx(v, i, 1u << (format->bits[i] - 2));
+ break;
+
+ case GL_UNSIGNED_INT:
+ set_idx(v, i, 1u << (format->bits[i] - 1));
+ break;
+
+ default:
+ abort();
+ }
+ }
+
+ return v;
+}
+
+static unsigned
+image_channel_fraction_bits(const struct image_format_info *format, unsigned i)
+{
+ if (image_base_type(format) == GL_FLOAT && format->bits[i]) {
+ switch (format->pixel_type) {
+ case GL_FLOAT:
+ return 23;
+
+ case GL_HALF_FLOAT:
+ return 10;
+
+ case GL_UNSIGNED_INT_10F_11F_11F_REV:
+ return format->bits[i] - 5;
+
+ case GL_SHORT:
+ case GL_BYTE:
+ return format->bits[i] - 1;
+
+ case GL_UNSIGNED_SHORT:
+ case GL_UNSIGNED_INT_2_10_10_10_REV:
+ case GL_UNSIGNED_BYTE:
+ return format->bits[i];
+
+ default:
+ abort();
+ }
+ } else {
+ return 0;
+ }
+}
+
+struct image_datum
+image_format_epsilon(const struct image_format_info *format)
+{
+ struct image_datum v = { 0.0 };
+ int i;
+
+ for (i = 0; i < 4; ++i) {
+ unsigned p = image_channel_fraction_bits(format, i);
+ set_idx(v, i, (p ? MAX2(1.0 / ((1 << p) - 1), 1e-5) : 0));
+ }
+
+ return v;
+}
+
+uint32_t
+encode(const struct image_format_info *format, double x)
+{
+ switch (image_base_type(format)) {
+ case GL_UNSIGNED_INT:
+ return x;
+
+ case GL_INT:
+ return (int32_t)x;
+
+ case GL_FLOAT: {
+ float y = x;
+ return *(uint32_t *)&y;
+ }
+ default:
+ abort();
+ }
+}
+
+double
+decode(const struct image_format_info *format, uint32_t x)
+{
+ switch (image_base_type(format)) {
+ case GL_UNSIGNED_INT:
+ return x;
+
+ case GL_INT:
+ return (int32_t)x;
+
+ case GL_FLOAT:
+ return *(float *)&x;
+
+ default:
+ abort();
+ }
+}
+
+const struct image_target_info *
+image_targets(void)
+{
+ const struct image_target_info known[] = {
+ { "1D", GL_TEXTURE_1D, "int" },
+ { "2D", GL_TEXTURE_2D, "ivec2" },
+ { "3D", GL_TEXTURE_3D, "ivec3" },
+ { "2DRect", GL_TEXTURE_RECTANGLE, "ivec2" },
+ { "Cube", GL_TEXTURE_CUBE_MAP, "ivec3" },
+ { "Buffer", GL_TEXTURE_BUFFER, "int" },
+ { "1DArray", GL_TEXTURE_1D_ARRAY, "ivec2" },
+ { "2DArray", GL_TEXTURE_2D_ARRAY, "ivec3" },
+ { "CubeArray", GL_TEXTURE_CUBE_MAP_ARRAY, "ivec3" },
+ { "2DMS", GL_TEXTURE_2D_MULTISAMPLE, "ivec2" },
+ { "2DMSArray", GL_TEXTURE_2D_MULTISAMPLE_ARRAY, "ivec3" },
+ { 0 }
+ };
+ static struct image_target_info supported[ARRAY_SIZE(known)];
+
+ if (!supported[0].name) {
+ int max_samples = 0, i, n = 0;
+
+ glGetIntegerv(GL_MAX_IMAGE_SAMPLES, &max_samples);
+
+ for (i = 0; i < ARRAY_SIZE(known); ++i) {
+ if ((known[i].target != GL_TEXTURE_2D_MULTISAMPLE &&
+ known[i].target !=
GL_TEXTURE_2D_MULTISAMPLE_ARRAY) ||
+ max_samples > 0) {
+ supported[n++] = known[i];
+ }
+ }
+ }
+
+ return supported;
+}
+
+const struct image_target_info *
+get_image_target(GLenum t)
+{
+ const struct image_target_info *target;
+
+ for (target = image_targets(); target->target; ++target) {
+ if (target->target == t)
+ return target;
+ }
+
+ return NULL;
+}
+
+struct image_extent
+image_target_limits(const struct image_target_info *target)
+{
+ struct image_extent ext = { 1, 1, 1, 1 };
+
+ switch (target->target) {
+ case GL_TEXTURE_1D:
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.x);
+ break;
+
+ case GL_TEXTURE_2D:
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.y);
+ break;
+
+ case GL_TEXTURE_3D:
+ glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, (int *)&ext.y);
+ glGetIntegerv(GL_MAX_3D_TEXTURE_SIZE, (int *)&ext.z);
+ break;
+
+ case GL_TEXTURE_RECTANGLE:
+ glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_RECTANGLE_TEXTURE_SIZE, (int *)&ext.y);
+ break;
+
+ case GL_TEXTURE_CUBE_MAP:
+ glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, (int *)&ext.y);
+ ext.z = 6;
+ break;
+
+ case GL_TEXTURE_BUFFER:
+ glGetIntegerv(GL_MAX_TEXTURE_BUFFER_SIZE, (int *)&ext.x);
+ break;
+
+ case GL_TEXTURE_1D_ARRAY:
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, (int *)&ext.y);
+ break;
+
+ case GL_TEXTURE_2D_ARRAY:
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.y);
+ glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, (int *)&ext.z);
+ break;
+
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, (int *)&ext.y);
+ glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, (int *)&ext.z);
+ break;
+
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ glGetIntegerv(GL_MAX_IMAGE_SAMPLES, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.y);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.z);
+ break;
+
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ glGetIntegerv(GL_MAX_IMAGE_SAMPLES, (int *)&ext.x);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.y);
+ glGetIntegerv(GL_MAX_TEXTURE_SIZE, (int *)&ext.z);
+ glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, (int *)&ext.w);
+ break;
+
+ default:
+ abort();
+ }
+
+ return ext;
+}
+
+unsigned
+image_target_samples(const struct image_target_info *target)
+{
+ if (target->target == GL_TEXTURE_2D_MULTISAMPLE ||
+ target->target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) {
+ return image_target_limits(target).x;
+ } else {
+ return 1;
+ }
+}
+
+struct image_extent
+image_extent_for_target(const struct image_target_info *target,
+ unsigned w, unsigned h)
+{
+ switch (target->target) {
+ case GL_TEXTURE_1D: {
+ struct image_extent ext = { w * h, 1, 1, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_2D: {
+ struct image_extent ext = { w, h, 1, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_3D: {
+ struct image_extent ext = { w, w, h / w, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_RECTANGLE: {
+ struct image_extent ext = { w, h, 1, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_CUBE_MAP: {
+ struct image_extent ext = { w, w, h / w, 1 };
+ assert(ext.z == 6);
+ return ext;
+ }
+ case GL_TEXTURE_BUFFER: {
+ struct image_extent ext = { w * h, 1, 1, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_1D_ARRAY: {
+ struct image_extent ext = { w, h, 1, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_2D_ARRAY: {
+ struct image_extent ext = { w, w, h / w, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_CUBE_MAP_ARRAY: {
+ struct image_extent ext = { w, w, h / w, 1 };
+ assert(ext.z % 6 == 0);
+ return ext;
+ }
+ case GL_TEXTURE_2D_MULTISAMPLE: {
+ struct image_extent ext = { 2, w / 2, h, 1 };
+ return ext;
+ }
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY: {
+ struct image_extent ext = { 2, w / 2, w, h / w };
+ return ext;
+ }
+ default:
+ abort();
+ }
+}
+
+GLenum
+image_layer_target(const struct image_target_info *target)
+{
+ switch (target->target) {
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_1D_ARRAY:
+ return GL_TEXTURE_1D;
+
+ case GL_TEXTURE_2D:
+ case GL_TEXTURE_3D:
+ case GL_TEXTURE_CUBE_MAP:
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ return GL_TEXTURE_2D;
+
+ case GL_TEXTURE_RECTANGLE:
+ return GL_TEXTURE_RECTANGLE;
+
+ case GL_TEXTURE_BUFFER:
+ return GL_TEXTURE_BUFFER;
+
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ return GL_TEXTURE_2D_MULTISAMPLE;
+
+ default:
+ abort();
+ }
+}
+
+unsigned
+image_target_mipmapping_dimensions(const struct image_target_info *target)
+{
+ switch (target->target) {
+ case GL_TEXTURE_RECTANGLE:
+ case GL_TEXTURE_BUFFER:
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ return 0;
+
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_1D_ARRAY:
+ return 1;
+
+ case GL_TEXTURE_2D:
+ case GL_TEXTURE_CUBE_MAP:
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ return 2;
+
+ case GL_TEXTURE_3D:
+ return 3;
+
+ default:
+ abort();
+ }
+}
+
+const struct image_stage_info *
+image_stages(void)
+{
+ const struct image_stage_info known[] = {
+ { "Vertex", GL_VERTEX_SHADER, GL_VERTEX_SHADER_BIT },
+ { "Tessellation control", GL_TESS_CONTROL_SHADER,
+ GL_TESS_CONTROL_SHADER_BIT },
+ { "Tessellation evaluation", GL_TESS_EVALUATION_SHADER,
+ GL_TESS_EVALUATION_SHADER_BIT },
+ { "Geometry", GL_GEOMETRY_SHADER, GL_GEOMETRY_SHADER_BIT },
+ { "Fragment", GL_FRAGMENT_SHADER, GL_FRAGMENT_SHADER_BIT },
+ { "Compute", GL_COMPUTE_SHADER, GL_COMPUTE_SHADER_BIT },
+ { 0 }
+ };
+ static struct image_stage_info supported[ARRAY_SIZE(known)];
+
+ if (!supported[0].name) {
+ int i, n = 0;
+
+ for (i = 0; i < ARRAY_SIZE(known); ++i) {
+ if (image_stage_max_images(&known[i]))
+ supported[n++] = known[i];
+ }
+ }
+
+ return supported;
+}
+
+const struct image_stage_info *
+get_image_stage(GLenum s)
+{
+ const struct image_stage_info *stage;
+
+ for (stage = image_stages(); stage->stage; ++stage) {
+ if (stage->stage == s)
+ return stage;
+ }
+
+ return NULL;
+}
+
+unsigned
+image_stage_max_images(const struct image_stage_info *stage)
+{
+ int n = 0;
+
+ switch (stage->stage) {
+ case GL_FRAGMENT_SHADER:
+ glGetIntegerv(GL_MAX_FRAGMENT_IMAGE_UNIFORMS, &n);
+ return n;
+
+ case GL_VERTEX_SHADER:
+ glGetIntegerv(GL_MAX_VERTEX_IMAGE_UNIFORMS, &n);
+ return n;
+
+ case GL_GEOMETRY_SHADER:
+ if (piglit_get_gl_version() >= 32)
+ glGetIntegerv(GL_MAX_GEOMETRY_IMAGE_UNIFORMS, &n);
+ return n;
+
+ case GL_TESS_CONTROL_SHADER:
+ if
(piglit_is_extension_supported("GL_ARB_tessellation_shader"))
+ glGetIntegerv(GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS, &n);
+ return n;
+
+ case GL_TESS_EVALUATION_SHADER:
+ if
(piglit_is_extension_supported("GL_ARB_tessellation_shader"))
+ glGetIntegerv(GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS,
+ &n);
+ return n;
+
+ case GL_COMPUTE_SHADER:
+ if (piglit_is_extension_supported("GL_ARB_compute_shader"))
+ glGetIntegerv(GL_MAX_COMPUTE_IMAGE_UNIFORMS, &n);
+ return n;
+
+ default:
+ return 0;
+ }
+}
+
+unsigned
+max_combined_images(void)
+{
+ int n;
+
+ glGetIntegerv(GL_MAX_COMBINED_IMAGE_UNIFORMS, &n);
+ return n;
+}
+
+unsigned
+max_image_units(void)
+{
+ int n;
+
+ glGetIntegerv(GL_MAX_IMAGE_UNITS, &n);
+ return n;
+}
+
+unsigned
+image_num_layers(const struct image_info img)
+{
+ switch (image_layer_target(img.target)) {
+ case GL_TEXTURE_1D:
+ return img.size.y;
+
+ case GL_TEXTURE_2D:
+ return img.size.z;
+
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ return img.size.w;
+
+ default:
+ return 1;
+ }
+}
+
+unsigned
+image_num_levels(const struct image_info img)
+{
+ const unsigned d = image_target_mipmapping_dimensions(img.target);
+ unsigned i, size = 1;
+
+ for (i = 0; i < d; ++i)
+ size = MAX2(size, get_idx(img.size, i));
+
+ return (unsigned)log2(size) + 1;
+}
+
+struct image_extent
+image_level_size(const struct image_info img, unsigned l)
+{
+ const unsigned d = image_target_mipmapping_dimensions(img.target);
+ struct image_extent size;
+ int i;
+
+ for (i = 0; i < d; ++i)
+ set_idx(size, i, MAX2(get_idx(img.size, i) >> l, 1));
+
+ for (i = d; i < 4; ++i)
+ set_idx(size, i, get_idx(img.size, i));
+
+ return size;
+}
diff --git a/tests/spec/arb_shader_image_load_store/image.h
b/tests/spec/arb_shader_image_load_store/image.h
new file mode 100644
index 0000000..501cdb7
--- /dev/null
+++ b/tests/spec/arb_shader_image_load_store/image.h
@@ -0,0 +1,375 @@
+/*
+ * 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 image.h
+ *
+ * Common image format, target and shader stage metadata.
+ */
+
+#ifndef __PIGLIT_ARB_SHADER_IMAGE_LOAD_STORE_IMAGE_H__
+#define __PIGLIT_ARB_SHADER_IMAGE_LOAD_STORE_IMAGE_H__
+
+#include "piglit-util-gl.h"
+
+/**
+ * Image color value.
+ */
+struct image_datum {
+ double x;
+ double y;
+ double z;
+ double w;
+};
+
+/**
+ * Size of an image. Unused dimensions equal 1 by convention.
+ */
+struct image_extent {
+ unsigned x;
+ unsigned y;
+ unsigned z;
+ unsigned w;
+};
+
+#define get_idx(v, i) \
+ ((i) == 0 ? (v).x : \
+ (i) == 1 ? (v).y : \
+ (i) == 2 ? (v).z : \
+ (i) == 3 ? (v).w : 0)
+
+#define set_idx(v, i, a) \
+ (*((i) == 0 ? &(v).x : \
+ (i) == 1 ? &(v).y : \
+ (i) == 2 ? &(v).z : \
+ (i) == 3 ? &(v).w : NULL)) = (a)
+
+#define product(v) ((v).x * (v).y * (v).z * (v).w)
+
+/**
+ * Get a two-dimensional image_extent with the same number of elements
+ * as the argument, where each dimension is reasonably close to the
+ * square root of the total number of elements, e.g. for use as grid
+ * invocation size.
+ */
+struct image_extent
+image_optimal_extent(struct image_extent ext);
+
+struct image_format_info {
+ /** Format name as specified by GLSL. */
+ const char *name;
+
+ /** Format enum. */
+ GLenum format;
+
+ /** Pixel transfer format (e.g. as specified for glGetTexImage()). */
+ GLenum pixel_format;
+
+ /** Pixel transfer type (e.g. as specified for glGetTexImage()). */
+ GLenum pixel_type;
+
+ /** Number of storage bits for each component. */
+ unsigned bits[4];
+};
+
+/**
+ * Image formats supported by image load and store built-ins.
+ */
+extern const struct image_format_info image_formats_load_store[];
+
+/**
+ * Image formats supported by image atomic built-ins.
+ */
+extern const struct image_format_info image_formats_atomic[];
+
+/**
+ * Get information for the specified image format.
+ */
+const struct image_format_info *
+get_image_format(GLenum format);
+
+/**
+ * Get the logical base format as seen by the shader (either GL_RGBA
+ * or GL_RGBA_INTEGER).
+ */
+GLenum
+image_base_format(const struct image_format_info *format);
+
+/**
+ * Get the logical component type as seen by the shader.
+ */
+GLenum
+image_base_type(const struct image_format_info *format);
+
+/**
+ * Get the logical internal format as seen by the shader.
+ */
+GLenum
+image_base_internal_format(const struct image_format_info *format);
+
+/**
+ * Get a compatible unsigned integer format of the same size.
+ */
+GLenum
+image_compat_format(const struct image_format_info *format);
+
+/**
+ * Get the GLSL component data type for an image format.
+ */
+const char *
+image_scalar_type_name(const struct image_format_info *format);
+
+/**
+ * Get the GLSL vector data type for an image format.
+ */
+const char *
+image_vector_type_name(const struct image_format_info *format);
+
+/**
+ * Get the GLSL image type prefix for an image format.
+ */
+const char *
+image_type_name(const struct image_format_info *format);
+
+/**
+ * Get the number of color components representable in an image format.
+ */
+unsigned
+image_num_components(const struct image_format_info *format);
+
+/**
+ * Get an arbitrary per-component test scale used to make sure that we
+ * exercise a significant portion of the representable range without
+ * overflowing it.
+ */
+struct image_datum
+image_format_scale(const struct image_format_info *format);
+
+/**
+ * Get the per-component error tolerance for an image format.
+ */
+struct image_datum
+image_format_epsilon(const struct image_format_info *format);
+
+/**
+ * Convert \a x to the base data type of the specified image format.
+ */
+uint32_t
+encode(const struct image_format_info *format, double x);
+
+/**
+ * Convert \a x from the base data type of the specified image format.
+ */
+double
+decode(const struct image_format_info *format, uint32_t x);
+
+struct image_target_info {
+ /** Target name and GLSL image type suffix. */
+ const char *name;
+
+ /** Target enum. */
+ GLenum target;
+
+ /** Vector type used as address argument for this target. */
+ const char *addr_type_name;
+};
+
+/**
+ * Get all image targets supported by the implementation.
+ */
+const struct image_target_info *
+image_targets(void);
+
+/**
+ * Get information for the specified target.
+ */
+const struct image_target_info *
+get_image_target(GLenum t);
+
+/**
+ * Get the maximum supported dimensions for the specified target.
+ */
+struct image_extent
+image_target_limits(const struct image_target_info *target);
+
+/**
+ * Get the maximum supported number of samples for the specified
+ * target.
+ */
+unsigned
+image_target_samples(const struct image_target_info *target);
+
+/**
+ * Get reasonable dimensions for an image of type \a target intended
+ * to be in one-to-one mapping to a two-dimensional grid of dimensions
+ * \a w and \a h.
+ */
+struct image_extent
+image_extent_for_target(const struct image_target_info *target,
+ unsigned w, unsigned h);
+
+/**
+ * Get the target type for a single layer of the specified image
+ * target.
+ */
+GLenum
+image_layer_target(const struct image_target_info *target);
+
+/**
+ * Get the number of dimensions of an image target that are minified
+ * in higher mipmap levels.
+ */
+unsigned
+image_target_mipmapping_dimensions(const struct image_target_info *target);
+
+struct image_stage_info {
+ /** Shader stage name. */
+ const char *name;
+
+ /** Target enum. */
+ GLenum stage;
+
+ /** Value used in bit sets for this shader stage. */
+ GLbitfield bit;
+};
+
+/**
+ * Get all shader stages that support image access in pipeline order.
+ */
+const struct image_stage_info *
+image_stages(void);
+
+/**
+ * Get information for the specified stage.
+ */
+const struct image_stage_info *
+get_image_stage(GLenum s);
+
+/**
+ * Get the maximum number of supported image uniforms from the
+ * specified stage.
+ */
+unsigned
+image_stage_max_images(const struct image_stage_info *stage);
+
+/**
+ * Get the maximum sum of image uniforms from all shaders.
+ */
+unsigned
+max_combined_images(void);
+
+/**
+ * Get the maximum number of independent image units.
+ */
+unsigned
+max_image_units(void);
+
+struct image_info {
+ /** Texture target of this image object. */
+ const struct image_target_info *target;
+
+ /** Format of this image object. */
+ const struct image_format_info *format;
+
+ /** Dimensions of this image object. */
+ struct image_extent size;
+
+ /** Error tolerance for this image object. */
+ struct image_datum epsilon;
+};
+
+/**
+ * Construct an image_info object.
+ */
+static inline struct image_info
+image_info(GLenum target, GLenum format, unsigned w, unsigned h)
+{
+ const struct image_target_info *t = get_image_target(target);
+ const struct image_format_info *f = get_image_format(format);
+ const struct image_info img = {
+ t, f,
+ image_extent_for_target(t, w, h),
+ image_format_epsilon(f)
+ };
+
+ return img;
+}
+
+/**
+ * Set the dimensions of an image.
+ */
+static inline struct image_info
+set_image_size(struct image_info img,
+ unsigned x, unsigned y, unsigned z, unsigned w)
+{
+ const struct image_extent size = { x, y, z, w };
+ img.size = size;
+ return img;
+}
+
+/**
+ * Get the number of layers of an image.
+ */
+unsigned
+image_num_layers(const struct image_info img);
+
+/**
+ * Get the maximum number of mipmap levels for an image.
+ */
+unsigned
+image_num_levels(const struct image_info img);
+
+/**
+ * Get the dimensions of the specified mipmap level of an image.
+ */
+struct image_extent
+image_level_size(const struct image_info img, unsigned l);
+
+/**
+ * Get the offset in texels of the specified mipmap level of an
+ * image.
+ */
+static inline unsigned
+image_level_offset(const struct image_info img, unsigned l)
+{
+ return (l == 0 ? 0 :
+ image_level_offset(img, l - 1) +
+ product(image_level_size(img, l - 1)));
+}
+
+/**
+ * Construct an image_info object for mipmap level \a l of the
+ * specified base image.
+ */
+static inline struct image_info
+image_info_for_level(struct image_info img, unsigned l)
+{
+ const struct image_info level_img = {
+ img.target, img.format,
+ image_level_size(img, l),
+ img.epsilon
+ };
+
+ return level_img;
+}
+
+#endif
--
2.1.1
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