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MobileGL/MobileGL/MG_Test/State/NegativeApiErrorsTest.cpp
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// MobileGL - MobileGL/MG_Test/State/NegativeApiErrorsTest.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
// The negative-path GL errors the conformance suite checks and MobileGL used to answer
// GL_NO_ERROR to. Every row here is a call the spec requires to fail, lifted from the CTS case
// that found it:
// * KHR-GL44.multi_bind.errors_bind_buffers / .errors_bind_samplers - ARB_multi_bind's
// "buffers/samplers will not be created if they do not exist" rule, plus the atomic-counter
// offset alignment the single-bind path never had.
// * KHR-GL43.shader_storage_buffer_object.negative-api-bind - the SSBO offset alignment is a
// property of the binding point and applies with buffer 0 too.
// * KHR-GL46.indirect_parameters_tests.MultiDraw{Arrays,Elements}IndirectCount - the three
// errors that guard a parameter-buffer draw.
// * KHR-GL43.compute_shader.api-indirect / .api-program.
// * KHR-GLxx.texture_storage.compressed_data - compressed formats on TEXTURE_3D.
// Plus the indexed-getter parity RC-7b is about: glGetBooleani_v / glGetInteger64i_v /
// glGetFloati_v / glGetDoublei_v must answer every pname glGetIntegeri_v answers.
//
// GPU-free: all of it is frontend validation.
#include <gtest/gtest.h>
#include <functional>
#include <string>
#include <vector>
#include "Includes.h"
#include "Init.h"
#include <MG_Impl/GLImpl/Buffer/GL_Buffer.h>
#include <MG_Impl/GLImpl/Drawing/GL_Drawing.h>
#include <MG_Impl/GLImpl/Getter/GL_Getter.h>
#include <MG_Impl/GLImpl/Program/GL_Program.h>
#include <MG_Impl/GLImpl/RenderState/GL_RenderState.h>
#include <MG_Impl/GLImpl/Sampler/GL_Sampler.h>
#include <MG_Impl/GLImpl/Texture/GL_Texture.h>
#include <MG_Impl/GLImpl/VertexArray/GL_VertexArray.h>
#include <MG_State/GLState/Core.h>
using namespace MobileGL;
using namespace MobileGL::MG_Impl::GLImpl;
namespace {
class NegativeApiErrorsTest : public ::testing::Test {
protected:
void SetUp() override {
MobileGL::Initialize();
MG_State::pGLContext = MakeUnique<MG_State::GLState::GLContext>();
}
void TearDown() override {
EXPECT_EQ(GetError(), GL_NO_ERROR) << "test left an unconsumed GL error behind";
}
static void DrainErrors() {
for (int i = 0; i < 16 && GetError() != GL_NO_ERROR; ++i) {
}
}
static GLuint MakeBuffer(GLenum target, GLsizeiptr size) {
GLuint buffer = 0;
GenBuffers(1, &buffer);
BindBuffer(target, buffer);
BufferData(target, size, nullptr, GL_STATIC_DRAW);
return buffer;
}
// One table row: run the call, assert exactly the expected error, leave nothing pending.
struct Row {
const char* what;
std::function<void()> call;
GLenum expected;
};
static void RunRows(const std::vector<Row>& rows) {
for (const Row& row : rows) {
DrainErrors();
row.call();
EXPECT_EQ(GetError(), row.expected) << row.what;
DrainErrors();
}
}
};
TEST_F(NegativeApiErrorsTest, MultiBindRejectsNamesThatAreNotObjectsYet) {
const GLuint buffer = MakeBuffer(GL_UNIFORM_BUFFER, 1024);
// Reserved by glGenBuffers but never turned into an object: legal for glBindBuffer,
// which creates it, and illegal for glBindBuffersBase, which must not.
GLuint reservedOnly = 0;
GenBuffers(1, &reservedOnly);
ASSERT_NE(reservedOnly, 0u);
ASSERT_EQ(IsBuffer(reservedOnly), GL_FALSE);
// glGenSamplers, unlike glGenBuffers, creates the objects outright, so a sampler name is
// only "not an existing object" once it has been deleted.
GLuint deadSampler = 0;
GenSamplers(1, &deadSampler);
ASSERT_NE(deadSampler, 0u);
DeleteSamplers(1, &deadSampler);
DrainErrors();
const GLuint mixedBuffers[2] = {buffer, reservedOnly};
const GLuint samplers[1] = {deadSampler};
const GLintptr offsets[2] = {0, 0};
const GLsizeiptr sizes[2] = {256, 256};
RunRows({
{"glBindBuffersBase with a reserved-but-uncreated name",
[&] { BindBuffersBase(GL_UNIFORM_BUFFER, 0, 2, mixedBuffers); }, GL_INVALID_OPERATION},
{"glBindBuffersRange with a reserved-but-uncreated name",
[&] { BindBuffersRange(GL_UNIFORM_BUFFER, 0, 2, mixedBuffers, offsets, sizes); },
GL_INVALID_OPERATION},
{"glBindSamplers with a deleted sampler name", [&] { BindSamplers(0, 1, samplers); },
GL_INVALID_OPERATION},
});
// ARB_multi_bind defines these as a LOOP of single binds, so the bad entry costs its own
// binding point and the good one still binds - only the error is new.
GLint bound = -1;
GetIntegeri_v(GL_UNIFORM_BUFFER_BINDING, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), buffer) << "a rejected element must not take the valid ones with it";
GetIntegeri_v(GL_UNIFORM_BUFFER_BINDING, 1, &bound);
EXPECT_EQ(bound, 0) << "the rejected element must not have bound anything";
DrainErrors();
}
// KHR-GL44.multi_bind.errors_bind_textures / .errors_bind_image_textures / .errors_bind_samplers.
// Both entry points were silent no-op stubs, so every row here answered GL_NO_ERROR.
// errors_bind_samplers is in the list because that case checks the invalid-name rule by calling
// glBindTextures with a sampler-name array - a name from the wrong namespace is simply not an
// existing texture.
TEST_F(NegativeApiErrorsTest, MultiBindTexturesRejectsBadRangesAndNames) {
GLint maxUnits = 0;
GetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &maxUnits);
ASSERT_GT(maxUnits, 0);
GLint maxImageUnits = 0;
GetIntegerv(GL_MAX_IMAGE_UNITS, &maxImageUnits);
GLuint texture = 0;
GenTextures(1, &texture);
BindTexture(GL_TEXTURE_2D, texture);
TexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, 4, 4);
// Reserved by glGenTextures but never bound: not an object yet, so the multi-bind entry
// points must refuse it instead of creating it the way glBindTexture would.
GLuint reservedOnly = 0;
GenTextures(1, &reservedOnly);
ASSERT_NE(reservedOnly, 0u);
ASSERT_EQ(IsTexture(reservedOnly), GL_FALSE);
DrainErrors();
const GLuint good[1] = {texture};
const GLuint mixed[2] = {texture, reservedOnly};
std::vector<Row> rows = {
{"glBindTextures with negative count", [&] { BindTextures(0, -1, good); }, GL_INVALID_VALUE},
{"glBindTextures with first + count past the last unit",
[&] { BindTextures(static_cast<GLuint>(maxUnits), 1, good); }, GL_INVALID_OPERATION},
{"glBindTextures with a reserved-but-uncreated name", [&] { BindTextures(0, 2, mixed); },
GL_INVALID_OPERATION},
{"glBindImageTextures with negative count", [&] { BindImageTextures(0, -1, good); }, GL_INVALID_VALUE},
};
if (maxImageUnits > 0) {
rows.push_back({"glBindImageTextures with first + count past the last image unit",
[&] { BindImageTextures(static_cast<GLuint>(maxImageUnits), 1, good); },
GL_INVALID_OPERATION});
rows.push_back({"glBindImageTextures with a reserved-but-uncreated name",
[&] { BindImageTextures(0, 2, mixed); }, GL_INVALID_OPERATION});
}
RunRows(rows);
// The loop semantics again: the good element at index 0 binds, the bad one does not.
GLint bound = -1;
GetIntegeri_v(GL_TEXTURE_BINDING_2D, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), texture) << "a rejected element must not take the valid ones with it";
GetIntegeri_v(GL_TEXTURE_BINDING_2D, 1, &bound);
EXPECT_EQ(bound, 0) << "the rejected element must not have bound anything";
DrainErrors();
}
// KHR-GL44.multi_bind.functional_bind_textures / .functional_bind_image_textures: the binding
// has to land on the texture's OWN target - glBindTextures takes no target parameter - and
// element zero has to unbind every target of its unit.
TEST_F(NegativeApiErrorsTest, MultiBindTexturesBindsToTheTexturesOwnTarget) {
GLuint textures[2] = {0, 0};
GenTextures(2, textures);
BindTexture(GL_TEXTURE_1D, textures[0]);
TexStorage1D(GL_TEXTURE_1D, 1, GL_RGBA8, 4);
BindTexture(GL_TEXTURE_3D, textures[1]);
TexStorage3D(GL_TEXTURE_3D, 1, GL_RGBA8, 4, 4, 4);
// Leave the active unit's slots clean so only the multi-bind result is under test.
BindTexture(GL_TEXTURE_1D, 0);
BindTexture(GL_TEXTURE_3D, 0);
DrainErrors();
BindTextures(0, 2, textures);
EXPECT_EQ(GetError(), GL_NO_ERROR);
GLint bound = -1;
GetIntegeri_v(GL_TEXTURE_BINDING_1D, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), textures[0]) << "a 1D texture must land on the unit's 1D slot";
GetIntegeri_v(GL_TEXTURE_BINDING_3D, 0, &bound);
EXPECT_EQ(bound, 0) << "no other target of the unit may be touched";
GetIntegeri_v(GL_TEXTURE_BINDING_3D, 1, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), textures[1]) << "a 3D texture must land on the unit's 3D slot";
// A zero element - and a NULL array - unbind EVERY target of the unit, not just one.
const GLuint zeros[1] = {0};
BindTextures(0, 1, zeros);
GetIntegeri_v(GL_TEXTURE_BINDING_1D, 0, &bound);
EXPECT_EQ(bound, 0);
BindTextures(1, 1, nullptr);
GetIntegeri_v(GL_TEXTURE_BINDING_3D, 1, &bound);
EXPECT_EQ(bound, 0) << "a NULL <textures> unbinds the range";
EXPECT_EQ(GetError(), GL_NO_ERROR);
GLint maxImageUnits = 0;
GetIntegerv(GL_MAX_IMAGE_UNITS, &maxImageUnits);
if (maxImageUnits > 0) {
// ARB_multi_bind fixes every glBindImageTexture parameter but the unit and the name:
// level 0, layered, layer 0, READ_WRITE, and the texture's own internal format.
BindImageTextures(0, 1, &textures[1]);
EXPECT_EQ(GetError(), GL_NO_ERROR);
GetIntegeri_v(GL_IMAGE_BINDING_NAME, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), textures[1]);
GetIntegeri_v(GL_IMAGE_BINDING_LEVEL, 0, &bound);
EXPECT_EQ(bound, 0);
GetIntegeri_v(GL_IMAGE_BINDING_LAYERED, 0, &bound);
EXPECT_EQ(bound, GL_TRUE);
GetIntegeri_v(GL_IMAGE_BINDING_ACCESS, 0, &bound);
EXPECT_EQ(bound, GL_READ_WRITE);
GetIntegeri_v(GL_IMAGE_BINDING_FORMAT, 0, &bound);
EXPECT_EQ(bound, GL_RGBA8);
BindImageTextures(0, 1, nullptr);
GetIntegeri_v(GL_IMAGE_BINDING_NAME, 0, &bound);
EXPECT_EQ(bound, 0) << "a NULL <textures> resets the image unit";
}
// Through the EXPORTED entry points, not just the GLImpl functions: both of these were
// declared with the stub macro, so a working implementation that is never wired into
// Definitions.cpp still answers GL_NO_ERROR and binds nothing.
::glBindTextures(0, 1, &textures[0]);
GetIntegeri_v(GL_TEXTURE_BINDING_1D, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), textures[0]) << "glBindTextures is still exported as a no-op stub";
if (maxImageUnits > 0) {
::glBindImageTextures(0, 1, &textures[1]);
GetIntegeri_v(GL_IMAGE_BINDING_NAME, 0, &bound);
EXPECT_EQ(static_cast<GLuint>(bound), textures[1])
<< "glBindImageTextures is still exported as a no-op stub";
}
DrainErrors();
}
TEST_F(NegativeApiErrorsTest, BufferRangeOffsetAlignmentAppliesToTheBindingPoint) {
GLint ssboAlignment = 0;
GetIntegerv(GL_SHADER_STORAGE_BUFFER_OFFSET_ALIGNMENT, &ssboAlignment);
ASSERT_GT(ssboAlignment, 1) << "the alignment rule is untestable at alignment 1";
const GLuint atomicBuffer = MakeBuffer(GL_ATOMIC_COUNTER_BUFFER, 1024);
DrainErrors();
RunRows({
// buffer 0 detaches the binding point, but the target's alignment rule still holds.
{"glBindBufferRange(SHADER_STORAGE_BUFFER, buffer 0, misaligned offset)",
[&] { BindBufferRange(GL_SHADER_STORAGE_BUFFER, 0, 0, ssboAlignment - 1, 0); }, GL_INVALID_VALUE},
// An atomic counter binding is addressed in 32-bit counters; it has no queryable
// alignment pname, which is how its rule went missing.
{"glBindBufferRange(ATOMIC_COUNTER_BUFFER, offset 3)",
[&] { BindBufferRange(GL_ATOMIC_COUNTER_BUFFER, 0, atomicBuffer, 3, 16); }, GL_INVALID_VALUE},
});
// ...and the aligned form still works.
DrainErrors();
BindBufferRange(GL_ATOMIC_COUNTER_BUFFER, 0, atomicBuffer, 4, 16);
EXPECT_EQ(GetError(), GL_NO_ERROR);
}
TEST_F(NegativeApiErrorsTest, DispatchComputeIndirectChecksTheBoundBufferExtent) {
// Six uints: an indirect dispatch reads three, so offset 16 runs off the end.
const GLuint dispatchBuffer = MakeBuffer(GL_DISPATCH_INDIRECT_BUFFER, 6 * sizeof(GLuint));
DrainErrors();
RunRows({
{"glDispatchComputeIndirect(-2)", [] { DispatchComputeIndirect(-2); }, GL_INVALID_VALUE},
{"glDispatchComputeIndirect(3)", [] { DispatchComputeIndirect(3); }, GL_INVALID_VALUE},
{"glDispatchComputeIndirect(16) past the end of a 24-byte buffer",
[] { DispatchComputeIndirect(16); }, GL_INVALID_OPERATION},
{"glDispatchComputeIndirect(0) with nothing bound",
[&] {
BindBuffer(GL_DISPATCH_INDIRECT_BUFFER, 0);
DispatchComputeIndirect(0);
},
GL_INVALID_OPERATION},
});
static_cast<void>(dispatchBuffer);
}
TEST_F(NegativeApiErrorsTest, IndirectParameterDrawsCheckBothBuffers) {
// Two DrawArraysIndirectCommands (16 bytes each) and a roomy parameter buffer.
MakeBuffer(GL_DRAW_INDIRECT_BUFFER, 2 * 4 * sizeof(GLuint));
const GLuint parameterBuffer = MakeBuffer(GL_PARAMETER_BUFFER, 200);
DrainErrors();
RunRows({
{"glMultiDrawArraysIndirectCount with drawcount 2 (not a multiple of four)",
[] { MultiDrawArraysIndirectCount(GL_TRIANGLE_STRIP, nullptr, 2, 1, 0); }, GL_INVALID_VALUE},
{"glMultiDrawArraysIndirectCount with maxdrawcount past the indirect buffer",
[] { MultiDrawArraysIndirectCount(GL_TRIANGLE_STRIP, nullptr, 0, 4, 0); }, GL_INVALID_OPERATION},
{"glMultiDrawElementsIndirectCount with drawcount 2",
[] { MultiDrawElementsIndirectCount(GL_TRIANGLE_STRIP, GL_UNSIGNED_BYTE, nullptr, 2, 1, 0); },
GL_INVALID_VALUE},
{"glMultiDrawArraysIndirectCount with no parameter buffer bound",
[&] {
BindBuffer(GL_PARAMETER_BUFFER, 0);
MultiDrawArraysIndirectCount(GL_TRIANGLE_STRIP, nullptr, 0, 2, 0);
},
GL_INVALID_OPERATION},
});
static_cast<void>(parameterBuffer);
}
TEST_F(NegativeApiErrorsTest, TexStorage3DRejectsCompressedFormatsOnTexture3D) {
GLuint texture = 0;
GenTextures(1, &texture);
BindTexture(GL_TEXTURE_3D, texture);
DrainErrors();
RunRows({
{"glTexStorage3D(TEXTURE_3D, GL_COMPRESSED_RED_RGTC1)",
[] { TexStorage3D(GL_TEXTURE_3D, 1, 0x8DBB /* GL_COMPRESSED_RED_RGTC1 */, 8, 8, 8); },
GL_INVALID_OPERATION},
{"glTexStorage3D(TEXTURE_3D, GL_COMPRESSED_RG_RGTC2)",
[] { TexStorage3D(GL_TEXTURE_3D, 1, 0x8DBD /* GL_COMPRESSED_RG_RGTC2 */, 8, 8, 8); },
GL_INVALID_OPERATION},
});
// An uncompressed sized format on the same target still allocates.
DrainErrors();
TexStorage3D(GL_TEXTURE_3D, 1, GL_RGBA8, 8, 8, 8);
EXPECT_EQ(GetError(), GL_NO_ERROR);
}
TEST_F(NegativeApiErrorsTest, LinkRejectsAComputeAndNonComputeMix) {
const auto attach = [](GLuint program, GLenum stage, const char* source) {
const GLuint shader = CreateShader(stage);
ShaderSource(shader, 1, &source, nullptr);
CompileShader(shader);
AttachShader(program, shader);
};
const GLuint program = CreateProgram();
attach(program, GL_COMPUTE_SHADER, R"(#version 430 core
layout(local_size_x = 1) in;
layout(std430) buffer Output { uint g_output[]; };
void main() { g_output[gl_GlobalInvocationID.x] = 0; }
)");
attach(program, GL_VERTEX_SHADER, R"(#version 430 core
layout(location = 0) in vec4 g_position;
void main() { gl_Position = g_position; }
)");
attach(program, GL_FRAGMENT_SHADER, R"(#version 430 core
layout(location = 0) out vec4 g_color;
void main() { g_color = vec4(1); }
)");
LinkProgram(program);
GLint status = GL_TRUE;
GetProgramiv(program, GL_LINK_STATUS, &status);
EXPECT_EQ(status, GL_FALSE) << "a compute shader must not link with any other stage";
DrainErrors();
}
// RC-7b: the four non-int indexed getters have to answer the same pname table glGetIntegeri_v
// does. glGetBooleani_v used to route everything through the indexed-capability path
// (GL_INVALID_ENUM for anything else) and glGetInteger64i_v straight to the driver, which
// does not have MobileGL's frontend-only values at all.
TEST_F(NegativeApiErrorsTest, IndexedGettersAgreeWithGetIntegeriv) {
DrainErrors();
const GLenum pnames[] = {GL_MAX_COMPUTE_WORK_GROUP_COUNT, GL_MAX_COMPUTE_WORK_GROUP_SIZE};
for (GLenum pname : pnames) {
for (GLuint index = 0; index < 3; ++index) {
GLint reference = -1;
GetIntegeri_v(pname, index, &reference);
ASSERT_EQ(GetError(), GL_NO_ERROR) << "glGetIntegeri_v(" << pname << ", " << index << ")";
ASSERT_GT(reference, 0) << "the reference value has to be non-trivial to compare against";
GLint64 as64 = -1;
GetInteger64i_v(pname, index, &as64);
EXPECT_EQ(as64, static_cast<GLint64>(reference)) << "glGetInteger64i_v(" << pname << ")";
EXPECT_EQ(GetError(), GL_NO_ERROR);
GLfloat asFloat = -1.0f;
GetFloati_v(pname, index, &asFloat);
EXPECT_FLOAT_EQ(asFloat, static_cast<GLfloat>(reference)) << "glGetFloati_v(" << pname << ")";
EXPECT_EQ(GetError(), GL_NO_ERROR);
GLdouble asDouble = -1.0;
GetDoublei_v(pname, index, &asDouble);
EXPECT_DOUBLE_EQ(asDouble, static_cast<GLdouble>(reference)) << "glGetDoublei_v(" << pname << ")";
EXPECT_EQ(GetError(), GL_NO_ERROR);
GLboolean asBool = GL_FALSE;
GetBooleani_v(pname, index, &asBool);
EXPECT_EQ(asBool, GL_TRUE) << "glGetBooleani_v(" << pname << ")";
EXPECT_EQ(GetError(), GL_NO_ERROR);
}
}
}
// ...and the vertex-binding offset keeps its 64-bit width through glGetInteger64i_v, which is
// how KHR-GL4x.vertex_attrib_binding reads it.
TEST_F(NegativeApiErrorsTest, VertexBindingOffsetIsReadableThroughTheSixtyFourBitGetter) {
GLuint vao = 0;
GenVertexArrays(1, &vao);
BindVertexArray(vao);
const GLuint vbo = MakeBuffer(GL_ARRAY_BUFFER, 4096);
DrainErrors();
GLint64 offset = -1;
GetInteger64i_v(GL_VERTEX_BINDING_OFFSET, 0, &offset);
EXPECT_EQ(offset, 0);
EXPECT_EQ(GetError(), GL_NO_ERROR);
BindVertexBuffer(0, vbo, 2048, 128);
GetInteger64i_v(GL_VERTEX_BINDING_OFFSET, 0, &offset);
EXPECT_EQ(offset, 2048);
EXPECT_EQ(GetError(), GL_NO_ERROR);
}
} // namespace
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