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MobileGL/MobileGL/MG_IntegrationTest/Scenarios/ImageBindableRemintScenario.cpp
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// MobileGL - MobileGL/MG_IntegrationTest/Scenarios/ImageBindableRemintScenario.cpp
// Copyright (c) 2025-2026 MobileGL-Dev
// Licensed under the GNU Lesser General Public License v3.0:
// https://www.gnu.org/licenses/gpl-3.0.txt
// https://www.gnu.org/licenses/lgpl-3.0.txt
// SPDX-License-Identifier: LGPL-3.0-only
// End of Source File Header
//
// Scenario - THE FIRST glBindImageTexture OF A TEXTURE THE GPU HAS ALREADY WRITTEN.
//
// ES only allows immutable storage on an image unit, and a few formats need a wider carrier on
// top (TextureImpl::GetImageBindableStorageWidening), so Espryt re-mints a texture the first time
// it is image-bound after it already has driver storage (RequireImageBindableStorage). The new
// storage has to hold what the old one held. The re-mint used to fill it from the frontend's
// shadow - the CLIENT's copy of each level - and the shadow never sees a GPU write: a render or
// clear into the level, a glGenerateMipmap, a null-data definition only the GPU ever filled. Every
// such level came back as the bytes the application last uploaded, or zeroes. That is the
// ~26.9k-pixel iris-derivative difference: an RGBA16F render target, first image-bound after it
// was rendered into.
//
// Every case gives a texture its content by one means, lets the backend create its storage (a
// sampling draw, or the FBO attach of a GPU clear), writes it on the GPU where the case says so,
// and then binds it to an image unit for the first time: a compute imageLoad copies the level into
// a destination that was image-bound before it was ever synced (so the destination itself never
// re-mints), and the destination is read back through an FBO. The expectation is the GL answer.
//
// The controls are the other half: levels the GPU never wrote (including formats whose driver
// readback may be refused), levels the driver does not have yet because they were defined after
// the last sync, and a pending client write that has to land on top of GPU content. Magma never
// re-mints from a shadow (it copies image to image) and is the control backend.
#include <array>
#include <cstdint>
#include <cstdlib>
#include <sstream>
#include <string>
#include <vector>
#include "../Harness/HeadlessGL.h"
#include "../Harness/ScenarioFixture.h"
#ifdef GLAPI
#undef GLAPI
#endif
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glcorearb.h>
#undef GL_GLEXT_PROTOTYPES
namespace MGITest {
namespace {
constexpr int kEdge = 8;
constexpr const char* kVS = R"(#version 430 core
void main() {
vec2 positions[3] = vec2[3](vec2(-1.0, -1.0), vec2(3.0, -1.0), vec2(-1.0, 3.0));
gl_Position = vec4(positions[gl_VertexID], 0.0, 1.0);
}
)";
constexpr const char* kSampleFS = R"(#version 430 core
uniform sampler2D u_tex;
out vec4 o_color;
void main() { o_color = texelFetch(u_tex, ivec2(gl_FragCoord.xy) % 4, 0); }
)";
// Copies an image into an RGBA8 image with imageLoad; a signed-normalized source is mapped
// to [0, 1] so it survives the unsigned destination.
std::string CopyCS(const char* srcFormat, bool snorm) {
std::string s = "#version 430 core\nlayout(local_size_x = 8, local_size_y = 8) in;\n";
s += std::string("layout(") + srcFormat + ", binding = 0) readonly uniform image2D u_src;\n";
s += "layout(rgba8, binding = 1) writeonly uniform image2D u_dst;\n";
s += "void main() { ivec2 p = ivec2(gl_GlobalInvocationID.xy); vec4 v = imageLoad(u_src, p);\n";
if (snorm) s += " v = v * 0.5 + 0.5;\n";
s += " imageStore(u_dst, p, v); }\n";
return s;
}
std::vector<GLubyte> Pattern(int edge, GLubyte magic) {
std::vector<GLubyte> t(static_cast<std::size_t>(edge * edge) * 4u);
for (int y = 0; y < edge; ++y)
for (int x = 0; x < edge; ++x) {
const std::size_t at = static_cast<std::size_t>((y * edge + x) * 4);
t[at + 0] = magic;
t[at + 1] = static_cast<GLubyte>(16 * (x + 1));
t[at + 2] = static_cast<GLubyte>(16 * (y + 1));
t[at + 3] = 0xFF;
}
return t;
}
std::vector<GLubyte> Solid(int edge, GLubyte r, GLubyte g, GLubyte b, GLubyte a) {
std::vector<GLubyte> t(static_cast<std::size_t>(edge * edge) * 4u);
for (std::size_t i = 0; i < t.size(); i += 4) {
t[i] = r;
t[i + 1] = g;
t[i + 2] = b;
t[i + 3] = a;
}
return t;
}
const GLfloat kGreen[4] = {0.0f, 1.0f, 0.0f, 1.0f};
class ImageBindableRemintScenario : public ScenarioTest {
protected:
void SetUp() override {
ScenarioTest::SetUp();
if (!Ready()) return;
std::string error;
m_sampleProgram = CompileProgram(kVS, kSampleFS, &error);
ASSERT_NE(m_sampleProgram, 0u) << error;
m_scratch = MakeColorFbo(4, 4);
glGenVertexArrays(1, &m_vao);
FirstGLError();
}
void TearDown() override {
if (!Ready()) return;
glUseProgram(0);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
if (m_sampleProgram) glDeleteProgram(m_sampleProgram);
if (m_vao) glDeleteVertexArrays(1, &m_vao);
if (!m_textures.empty()) glDeleteTextures(static_cast<GLsizei>(m_textures.size()), m_textures.data());
if (m_fbo) glDeleteFramebuffers(1, &m_fbo);
BindDefaultFramebuffer();
DestroyColorFbo(m_scratch);
glViewport(0, 0, Gl().Width(), Gl().Height());
FirstGLError();
}
GLuint NewTexture() {
GLuint t = 0;
glGenTextures(1, &t);
m_textures.push_back(t);
return t;
}
static void Nearest(GLenum target, GLuint tex, int maxLevel) {
glBindTexture(target, tex);
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, maxLevel);
glBindTexture(target, 0);
}
// A draw that samples the texture: the backend now holds storage for it.
void SyncBySampling(GLuint tex) {
BindFbo(m_scratch);
glUseProgram(m_sampleProgram);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, tex);
glUniform1i(glGetUniformLocation(m_sampleProgram, "u_tex"), 0);
glBindVertexArray(m_vao);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindVertexArray(0);
glBindTexture(GL_TEXTURE_2D, 0);
glUseProgram(0);
BindDefaultFramebuffer();
glFinish();
}
// A GPU write the frontend's shadow never sees. A layer >= 0 names one layer of an
// array texture.
void GpuClear(GLuint tex, int level, const GLfloat* color, int layer = -1) {
if (!m_fbo) glGenFramebuffers(1, &m_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
if (layer >= 0) {
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, tex, level, layer);
} else {
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tex, level);
}
EXPECT_EQ(glCheckFramebufferStatus(GL_FRAMEBUFFER), GLenum(GL_FRAMEBUFFER_COMPLETE))
<< "the clear target is incomplete";
glClearBufferfv(GL_COLOR, 0, color);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
BindDefaultFramebuffer();
}
// The first image binding of (src, level[, layer]): an imageLoad copy into a fresh RGBA8
// destination, read back through an FBO.
std::vector<GLubyte> ImageCopy(GLuint src, int level, GLenum unitFormat, const char* glslFormat,
bool snorm = false, int layer = 0) {
const GLuint dst = NewTexture();
glBindTexture(GL_TEXTURE_2D, dst);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge, kEdge);
glBindTexture(GL_TEXTURE_2D, 0);
glBindImageTexture(1, dst, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA8);
glBindImageTexture(0, src, level, GL_FALSE, layer, GL_READ_ONLY, unitFormat);
EXPECT_EQ(FirstGLError(), 0u) << "glBindImageTexture";
const std::string cs = CopyCS(glslFormat, snorm);
const char* csp = cs.c_str();
const GLuint shader = glCreateShader(GL_COMPUTE_SHADER);
glShaderSource(shader, 1, &csp, nullptr);
glCompileShader(shader);
const GLuint program = glCreateProgram();
glAttachShader(program, shader);
glLinkProgram(program);
glDeleteShader(shader);
GLint linked = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &linked);
EXPECT_EQ(linked, GL_TRUE) << "the copy program did not link";
glUseProgram(program);
// P11 M: A BARRIER THE SPEC DOES NOT ASK FOR, pinned for the reason
// TextureRemintPullScenario's twin gives (ID-P9-11, DEBTS "待归因"): on llvmpipe the
// kept-allocation case (GpuClearOverAnImmutableUploadSurvives - no re-mint to
// serialize anything) read the pre-clear upload once on the push-monolith arm under
// load, the same shape P9 measured 3/30 on the split arm. The cases ask what the
// storage HOLDS after the first image binding, not how a clear orders against an
// image load, so the ordering is pinned here.
glMemoryBarrier(GL_ALL_BARRIER_BITS);
glDispatchCompute(1, 1, 1);
glMemoryBarrier(GL_ALL_BARRIER_BITS);
glUseProgram(0);
glDeleteProgram(program);
glBindImageTexture(0, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
glBindImageTexture(1, 0, 0, GL_FALSE, 0, GL_READ_ONLY, GL_RGBA8);
if (!m_fbo) glGenFramebuffers(1, &m_fbo);
glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, dst, 0);
std::vector<GLubyte> out(static_cast<std::size_t>(kEdge * kEdge) * 4u, 0xA5);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glReadPixels(0, 0, kEdge, kEdge, GL_RGBA, GL_UNSIGNED_BYTE, out.data());
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, 0, 0);
BindDefaultFramebuffer();
EXPECT_EQ(FirstGLError(), 0u) << "copy/readback";
return out;
}
// The edge x edge corner of `got` against an RGBA8 expectation, the first `channels`
// channels only, within 2 codes (a normalized value's round trip).
static void ExpectImage(const std::vector<GLubyte>& got, int edge, const std::vector<GLubyte>& want,
int channels = 4) {
int bad = 0;
std::ostringstream first;
for (int y = 0; y < edge; ++y)
for (int x = 0; x < edge; ++x) {
const std::size_t g = static_cast<std::size_t>((y * kEdge + x) * 4);
const std::size_t w = static_cast<std::size_t>((y * edge + x) * 4);
bool texelBad = false;
for (int c = 0; c < channels; ++c)
texelBad |= std::abs(int(got[g + c]) - int(want[w + c])) > 2;
if (texelBad && bad++ == 0) {
first << "(" << x << "," << y << ") got " << int(got[g]) << "," << int(got[g + 1]) << ","
<< int(got[g + 2]) << "," << int(got[g + 3]) << " want " << int(want[w]) << ","
<< int(want[w + 1]) << "," << int(want[w + 2]) << "," << int(want[w + 3]);
}
}
EXPECT_EQ(bad, 0) << bad << " of " << edge * edge << " texels differ; first " << first.str();
}
// One glTexSubImage of opaque blue per {x, y, w, h} box, left pending.
static void WriteBlueBoxes(GLuint tex, const std::vector<std::array<int, 4>>& boxes) {
glBindTexture(GL_TEXTURE_2D, tex);
for (const auto& b : boxes) {
std::vector<GLubyte> blue(static_cast<std::size_t>(b[2] * b[3]) * 4u, 0);
for (std::size_t i = 0; i < blue.size(); i += 4) {
blue[i + 2] = 255;
blue[i + 3] = 255;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, b[0], b[1], b[2], b[3], GL_RGBA, GL_UNSIGNED_BYTE, blue.data());
}
glBindTexture(GL_TEXTURE_2D, 0);
}
// kEdge x kEdge green, blue inside the boxes.
static std::vector<GLubyte> GreenWithBlueBoxes(const std::vector<std::array<int, 4>>& boxes) {
auto want = Solid(kEdge, 0, 255, 0, 255);
for (const auto& b : boxes)
for (int y = b[1]; y < b[1] + b[3]; ++y)
for (int x = b[0]; x < b[0] + b[2]; ++x) {
const std::size_t at = static_cast<std::size_t>((y * kEdge + x) * 4);
want[at] = 0;
want[at + 1] = 0;
want[at + 2] = 255;
want[at + 3] = 255;
}
return want;
}
GLuint m_sampleProgram = 0, m_vao = 0, m_fbo = 0;
ColorFbo m_scratch{};
std::vector<GLuint> m_textures;
};
// Control: the shadow and the driver agree.
TEST_F(ImageBindableRemintScenario, UploadedLevelKeepsItsUpload) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, p);
}
TEST_F(ImageBindableRemintScenario, GpuClearOverAnUploadSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, Solid(kEdge, 0, 255, 0, 255));
}
// Immutable in a core image format: the storage is already what an image unit needs.
TEST_F(ImageBindableRemintScenario, GpuClearOverAnImmutableUploadSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge, kEdge);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kEdge, kEdge, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, Solid(kEdge, 0, 255, 0, 255));
}
// A null-data definition only the GPU ever filled: the shadow holds zeroes.
TEST_F(ImageBindableRemintScenario, GpuClearOfANullDefinitionSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, Solid(kEdge, 0, 255, 0, 255));
}
// A client write still pending when the bind comes lands on top of the GPU's content,
// and only inside its own box.
TEST_F(ImageBindableRemintScenario, PendingSubImageLandsOnTheGpuClear) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
const auto blue = Solid(2, 0, 0, 255, 255);
glBindTexture(GL_TEXTURE_2D, t);
glTexSubImage2D(GL_TEXTURE_2D, 0, 2, 2, 2, 2, GL_RGBA, GL_UNSIGNED_BYTE, blue.data());
glBindTexture(GL_TEXTURE_2D, 0);
auto want = Solid(kEdge, 0, 255, 0, 255);
for (int y = 2; y < 4; ++y)
for (int x = 2; x < 4; ++x) {
const std::size_t at = static_cast<std::size_t>((y * kEdge + x) * 4);
want[at] = 0;
want[at + 1] = 0;
want[at + 2] = 255;
want[at + 3] = 255;
}
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, want);
}
// Several pending writes: only their texels land on the GPU's clear, never the gaps between
// them. The re-mint merged the union box of the shadow over the readback whenever the rect
// list was withheld, and kept the shadow outright when that box spanned the level.
// Two 3x7 columns with a one-texel gap: 42 of their union's 49 texels, past the 3/4 at which
// the storage withholds its rect list.
TEST_F(ImageBindableRemintScenario, PendingSubImagesFillingThreeQuartersOfTheirUnionLandOnTheGpuClear) {
if (!Ready()) return;
const std::vector<std::array<int, 4>> boxes = {{0, 0, 3, 7}, {4, 0, 3, 7}};
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
WriteBlueBoxes(t, boxes);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, GreenWithBlueBoxes(boxes));
}
// Three quadrants: the union box is the whole level; the fourth quadrant is the GPU's.
TEST_F(ImageBindableRemintScenario, PendingSubImagesWhoseUnionSpansTheLevelLandOnTheGpuClear) {
if (!Ready()) return;
const std::vector<std::array<int, 4>> boxes = {{0, 0, 4, 4}, {4, 0, 4, 4}, {0, 4, 4, 4}};
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
GpuClear(t, 0, kGreen);
SyncBySampling(t);
WriteBlueBoxes(t, boxes);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, GreenWithBlueBoxes(boxes));
}
TEST_F(ImageBindableRemintScenario, GeneratedMipLevelSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto s = Solid(kEdge, 200, 100, 50, 255);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, s.data());
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 1, GL_RGBA8, "rgba8"), kEdge / 2, Solid(kEdge / 2, 200, 100, 50, 255));
}
TEST_F(ImageBindableRemintScenario, GpuClearOfAnUploadedMipLevelSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto s0 = Solid(kEdge, 200, 100, 50, 255);
const auto s1 = Solid(kEdge / 2, 10, 20, 30, 255);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, s0.data());
glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge / 2, kEdge / 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, s1.data());
Nearest(GL_TEXTURE_2D, t, 1);
SyncBySampling(t);
GpuClear(t, 1, kGreen);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 1, GL_RGBA8, "rgba8"), kEdge / 2, Solid(kEdge / 2, 0, 255, 0, 255));
}
// Control: a level defined (null data) after the last sync is not on the driver yet, so
// there is nothing to read back for it; the bound level 0 must still be the upload.
TEST_F(ImageBindableRemintScenario, LevelDefinedAfterTheSyncDoesNotDisturbTheOthers) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge / 2, kEdge / 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
glBindTexture(GL_TEXTURE_2D, 0);
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8"), kEdge, p);
}
// Control: the same late level, partly uploaded - the shadow is the only copy of it.
TEST_F(ImageBindableRemintScenario, LevelDefinedAndUploadedAfterTheSyncKeepsTheUpload) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, kEdge, kEdge, 0, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge / 2, kEdge / 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
const auto blue = Solid(2, 0, 0, 255, 255);
glTexSubImage2D(GL_TEXTURE_2D, 1, 0, 0, 2, 2, GL_RGBA, GL_UNSIGNED_BYTE, blue.data());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
glBindTexture(GL_TEXTURE_2D, 0);
ExpectImage(ImageCopy(t, 1, GL_RGBA8, "rgba8"), 2, blue);
}
// GL_RG8 is not an ESSL image format, so the re-mint also WIDENS the storage (to RGBA8)
// and cannot keep the old allocation even though it is immutable.
TEST_F(ImageBindableRemintScenario, GpuClearSurvivesAWideningRemint) {
if (!Ready()) return;
const GLuint t = NewTexture();
std::vector<GLubyte> rg(static_cast<std::size_t>(kEdge * kEdge) * 2u, 0x33);
glBindTexture(GL_TEXTURE_2D, t);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RG8, kEdge, kEdge);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kEdge, kEdge, GL_RG, GL_UNSIGNED_BYTE, rg.data());
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
const GLfloat c[4] = {0.5f, 0.25f, 0.0f, 1.0f};
GpuClear(t, 0, c);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RG8, "rg8"), kEdge, Solid(kEdge, 128, 64, 0, 255), 2);
}
// Control: widened, uploaded only.
TEST_F(ImageBindableRemintScenario, UploadSurvivesAWideningRemint) {
if (!Ready()) return;
const GLuint t = NewTexture();
std::vector<GLubyte> rg(static_cast<std::size_t>(kEdge * kEdge) * 2u);
for (std::size_t i = 0; i < rg.size(); i += 2) {
rg[i] = 0x33;
rg[i + 1] = 0x99;
}
glBindTexture(GL_TEXTURE_2D, t);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RG8, kEdge, kEdge);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kEdge, kEdge, GL_RG, GL_UNSIGNED_BYTE, rg.data());
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RG8, "rg8"), kEdge, Solid(kEdge, 0x33, 0x99, 0, 255), 2);
}
// Control: a signed-normalized level (not colour-renderable on every ES driver, so its
// readback may be refused and the shadow used instead), uploaded only.
TEST_F(ImageBindableRemintScenario, SnormUploadSurvives) {
if (!Ready()) return;
const GLuint t = NewTexture();
std::vector<GLbyte> s(static_cast<std::size_t>(kEdge * kEdge) * 4u);
for (std::size_t i = 0; i < s.size(); i += 4) {
s[i] = 127;
s[i + 1] = 0;
s[i + 2] = -127;
s[i + 3] = 127;
}
glBindTexture(GL_TEXTURE_2D, t);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8_SNORM, kEdge, kEdge, 0, GL_RGBA, GL_BYTE, s.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA8_SNORM, "rgba8_snorm", true), kEdge, Solid(kEdge, 255, 128, 0, 255), 3);
}
// Control: RGBA16_SNORM is desktop-only as an image format, so this re-mint widens too.
TEST_F(ImageBindableRemintScenario, Snorm16UploadSurvivesAWideningRemint) {
if (!Ready()) return;
const GLuint t = NewTexture();
std::vector<GLshort> s(static_cast<std::size_t>(kEdge * kEdge) * 4u);
for (std::size_t i = 0; i < s.size(); i += 4) {
s[i] = 32767;
s[i + 1] = 0;
s[i + 2] = -32767;
s[i + 3] = 32767;
}
glBindTexture(GL_TEXTURE_2D, t);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA16_SNORM, kEdge, kEdge);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kEdge, kEdge, GL_RGBA, GL_SHORT, s.data());
Nearest(GL_TEXTURE_2D, t, 0);
SyncBySampling(t);
ExpectImage(ImageCopy(t, 0, GL_RGBA16_SNORM, "rgba16_snorm", true), kEdge, Solid(kEdge, 255, 128, 0, 255),
3);
}
// An array texture is read back one layer at a time: the GPU-cleared layer and the
// uploaded one both have to come through. The clear's FBO attach is what gives the
// texture its driver storage here.
TEST_F(ImageBindableRemintScenario, GpuClearOfOneArrayLayerSurvivesBesideTheUploadedLayer) {
if (!Ready()) return;
const GLuint t = NewTexture();
const auto p = Pattern(kEdge, 0x40);
std::vector<GLubyte> layers(p);
layers.insert(layers.end(), p.begin(), p.end());
glBindTexture(GL_TEXTURE_2D_ARRAY, t);
glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA8, kEdge, kEdge, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE,
layers.data());
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
Nearest(GL_TEXTURE_2D_ARRAY, t, 0);
GpuClear(t, 0, kGreen, /*layer=*/1);
glFinish();
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8", false, /*layer=*/1), kEdge, Solid(kEdge, 0, 255, 0, 255));
ExpectImage(ImageCopy(t, 0, GL_RGBA8, "rgba8", false, /*layer=*/0), kEdge, p);
}
// A view owns no storage, so its first image binding is the VIEWED texture's transition,
// and the GPU's texels there have to come through it. Needs glTextureView, which Espryt
// only has where the ES driver does (not on llvmpipe).
TEST_F(ImageBindableRemintScenario, GpuClearSurvivesTheFirstImageBindingOfAView) {
if (!Ready()) return;
const GLuint owner = NewTexture();
const auto p = Pattern(kEdge, 0x40);
glBindTexture(GL_TEXTURE_2D, owner);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, kEdge, kEdge);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, kEdge, kEdge, GL_RGBA, GL_UNSIGNED_BYTE, p.data());
Nearest(GL_TEXTURE_2D, owner, 0);
SyncBySampling(owner);
GpuClear(owner, 0, kGreen);
SyncBySampling(owner);
const GLuint view = NewTexture();
FirstGLError();
glTextureView(view, GL_TEXTURE_2D, owner, GL_RGBA8, 0, 1, 0, 1);
if (const GLenum error = FirstGLError()) {
GTEST_SKIP() << "glTextureView is unavailable on backend " << Gl().BackendName() << " ("
<< GLErrorName(error) << ")";
}
Nearest(GL_TEXTURE_2D, view, 0);
SyncBySampling(view);
ExpectImage(ImageCopy(view, 0, GL_RGBA8, "rgba8"), kEdge, Solid(kEdge, 0, 255, 0, 255));
}
} // namespace
} // namespace MGITest
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