static inline GLuint
_glMultiDrawElementsIndirect_count(GLenum type, const GLvoid *indirect, GLsizei drawcount, GLsizei stride) {
const DrawElementsIndirectCommand *cmd;
GLvoid *temp = 0;
if (drawcount <= 0) {
return 0;
}
if (stride == 0) {
stride = sizeof *cmd;
}
GLint draw_indirect_buffer = _glGetInteger(GL_DRAW_INDIRECT_BUFFER_BINDING);
if (draw_indirect_buffer) {
// Read commands from indirect buffer object
GLintptr offset = (GLintptr)indirect;
GLsizeiptr size = sizeof *cmd + (drawcount - 1) * stride;
GLvoid *temp = malloc(size);
if (!temp) {
return 0;
}
memset(temp, 0, size);
_glGetBufferSubData(GL_DRAW_INDIRECT_BUFFER, offset, size, temp);
indirect = temp;
} else {
if (!indirect) {
return 0;
}
}
cmd = (const DrawElementsIndirectCommand *)indirect;
GLuint count = 0;
for (GLsizei i = 0; i < drawcount; ++i) {
cmd = (const DrawElementsIndirectCommand *)((const GLbyte *)indirect + i * stride);
GLuint count_i = _glDrawElementsInstancedBaseVertexBaseInstance_count(
cmd->count,
type,
(GLvoid *)(uintptr_t)(cmd->firstIndex * _gl_type_size(type)),
cmd->primCount,
cmd->baseVertex,
cmd->baseInstance
);
count = std::max(count, count_i);
}
if (draw_indirect_buffer) {
free(temp);
}
return count;
}
static inline GLuint
_glDrawElementsBaseVertex_count(GLsizei count, GLenum type, const GLvoid *indices, GLint basevertex)
{
GLvoid *temp = 0;
GLint element_array_buffer = 0;
if (!count) {
return 0;
}
_glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &element_array_buffer);
if (element_array_buffer) {
// Read indices from index buffer object
GLintptr offset = (GLintptr)indices;
GLsizeiptr size = count*_gl_type_size(type);
GLvoid *temp = malloc(size);
if (!temp) {
return 0;
}
memset(temp, 0, size);
_glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, temp);
indices = temp;
} else {
if (!indices) {
return 0;
}
}
GLuint maxindex = 0;
GLsizei i;
if (type == GL_UNSIGNED_BYTE) {
const GLubyte *p = (const GLubyte *)indices;
for (i = 0; i < count; ++i) {
if (p[i] > maxindex) {
maxindex = p[i];
}
}
} else if (type == GL_UNSIGNED_SHORT) {
const GLushort *p = (const GLushort *)indices;
for (i = 0; i < count; ++i) {
if (p[i] > maxindex) {
maxindex = p[i];
}
}
} else if (type == GL_UNSIGNED_INT) {
const GLuint *p = (const GLuint *)indices;
for (i = 0; i < count; ++i) {
if (p[i] > maxindex) {
maxindex = p[i];
}
}
} else {
os::log("apitrace: warning: %s: unknown GLenum 0x%04X\n", __FUNCTION__, type);
}
if (element_array_buffer) {
free(temp);
}
maxindex += basevertex;
return maxindex + 1;
}
GLuint
_glDraw_count(gltrace::Context *ctx, const DrawElementsParams ¶ms)
{
if (params.end < params.start ||
params.count <= 0) {
return 0;
}
if (params.end != ~0U) {
return params.end + params.basevertex + 1;
}
GLuint count = params.count;
GLenum type = params.type;
const void *indices = params.indices;
GLvoid *temp = 0;
if (!count) {
return 0;
}
GLint element_array_buffer = _element_array_buffer_binding();
if (element_array_buffer) {
// Read indices from index buffer object
if (ctx->profile.es()) {
// We could try to implement this on top of GL_OES_mapbuffer but should seldom be needed
os::log("apitrace: warning: %s: element array buffer with memory vertex arrays no longer supported on ES\n", __FUNCTION__);
return 0;
}
GLintptr offset = (GLintptr)indices;
GLsizeiptr size = count*_gl_type_size(type);
temp = malloc(size);
if (!temp) {
return 0;
}
memset(temp, 0, size);
_glGetBufferSubData(GL_ELEMENT_ARRAY_BUFFER, offset, size, temp);
indices = temp;
} else {
if (!indices) {
return 0;
}
}
GLuint maxindex = 0;
GLboolean restart_enabled = GL_FALSE;
GLuint restart_index = 0;
if (ctx->features.primitive_restart) {
_glIsEnabled(GL_PRIMITIVE_RESTART);
if (restart_enabled) {
restart_index = (GLuint)_glGetInteger(GL_PRIMITIVE_RESTART_INDEX);
}
}
GLsizei i;
if (type == GL_UNSIGNED_BYTE) {
const GLubyte *p = (const GLubyte *)indices;
for (i = 0; i < count; ++i) {
GLuint index = p[i];
if (restart_enabled && index == restart_index) {
continue;
}
if (index > maxindex) {
maxindex = index;
}
}
} else if (type == GL_UNSIGNED_SHORT) {
const GLushort *p = (const GLushort *)indices;
for (i = 0; i < count; ++i) {
GLuint index = p[i];
if (restart_enabled && index == restart_index) {
continue;
}
if (index > maxindex) {
maxindex = index;
}
}
} else if (type == GL_UNSIGNED_INT) {
const GLuint *p = (const GLuint *)indices;
for (i = 0; i < count; ++i) {
GLuint index = p[i];
if (restart_enabled && index == restart_index) {
continue;
}
if (index > maxindex) {
maxindex = index;
}
}
} else {
os::log("apitrace: warning: %s: unknown GLenum 0x%04X\n", __FUNCTION__, type);
}
if (element_array_buffer) {
free(temp);
}
maxindex += params.basevertex;
return maxindex + 1;
}
